CN104504845A - Loss prevention method, loss prevention device and loss prevention system - Google Patents
Loss prevention method, loss prevention device and loss prevention system Download PDFInfo
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- CN104504845A CN104504845A CN201410801966.5A CN201410801966A CN104504845A CN 104504845 A CN104504845 A CN 104504845A CN 201410801966 A CN201410801966 A CN 201410801966A CN 104504845 A CN104504845 A CN 104504845A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
- G08B21/0233—System arrangements with pre-alarms, e.g. when a first distance is exceeded
Abstract
The embodiment of the invention provides a loss prevention method, a loss prevention device and a loss prevention system and relates to the field of wireless signal transmission. The loss prevention method provided by the embodiment of the invention comprises the following steps: acquiring a first signal strength value of a first wireless signal transmitted by a wireless signal receiving and transmitting device by using the loss prevention device; measuring according to the first signal strength value to obtain the distance between the loss prevention device and the wireless signal receiving and transmitting device; judging whether the measured distance is larger than a preset detection distance, and sending an alarming signal if the measured distance is larger than the preset detection distance. By the loss prevention method, the loss prevention device and the loss prevention system provided by the embodiment of the invention, reliable guarantee is provided for preventing loss of a monitored object, and the problem that the existing monitored object is easy to lose can be solved.
Description
Technical field
The present invention relates to wireless signal transmission techniques field, in particular to a kind of anti-lost method, Apparatus and system.
Background technology
In life, the thing that old man's (particularly having the old man of senile dementia) or child go astray from the group occurs often, brings great misery to relatives.Although social security is in continuous progress, the phenomenon of stolen property still emerges in an endless stream.Wander away for relatives, the phenomenon of stolen property, people are in life except needs are more careful, and how more effectively avoiding this type of situation to occur has been a problem demanding prompt solution.
Summary of the invention
In view of this, the object of the embodiment of the present invention is to provide a kind of anti-lost method, Apparatus and system, to improve the problem that monitored object (old man, child, property etc.) is easily lost.
First aspect, the embodiment of the present invention additionally provides a kind of anti-lost method, is applied to anti-lose system, and described anti-lose system comprises anti-losing device, carries out the wireless signal transceiver of address binding with described anti-losing device, and described anti-lost method comprises:
Described anti-losing device obtains the first signal strength values of the first wireless signal that described wireless signal transceiver sends;
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to described first signal strength values;
Judge whether described distance is greater than default detection range, if so, then send alerting signal.
In conjunction with first aspect, embodiments provide the first possible embodiment of first aspect, described method also comprises:
The detection range preset described in described anti-losing device dynamic adjustments, the detection range after adjusted;
Describedly judge whether described distance is greater than default detection range, comprising:
Judge described distance whether be greater than described adjustment after detection range.
In conjunction with the first possible embodiment of first aspect, embodiments provide the embodiment that the second of first aspect is possible, wherein, the detection range preset described in described dynamic adjustments, comprising:
Described anti-losing device obtains the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends; The frequency of described first wireless signal is lower than the frequency of described second wireless signal;
The signal attenuation coefficient of current environment is obtained according to described secondary signal intensity level measuring and calculating;
The detection range preset according to the signal attenuation coefficient dynamic adjustments of described current environment, the detection range after adjusted;
Describedly calculate according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver, comprising:
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to the signal attenuation coefficient of described current environment and described first signal strength values;
Describedly judge whether described distance is greater than default detection range, comprising: judge described distance whether be greater than described adjustment after detection range.
In conjunction with the embodiment that the second of first aspect is possible, the embodiment of the present invention additionally provides the third possible embodiment of first aspect, and wherein, the frequency of described first wireless signal is 915MHz, and/or the frequency of described second wireless signal is 1GHz.
In conjunction with first aspect, the embodiment of the present invention additionally provides the 4th kind of possible embodiment of first aspect, and described method also comprises:
Described anti-losing device obtains the 3rd signal strength values of the 3rd wireless signal that described wireless signal transceiver sends simultaneously; Described first wireless signal and described 3rd wireless signal are respectively the wireless signal of different frequency;
Describedly calculate according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver, comprising:
According to described first signal strength values and described 3rd signal strength values, measuring and calculating obtains the signal attenuation coefficient of current environment and the distance between described anti-losing device and described wireless signal transceiver;
The detection range preset according to the signal attenuation coefficient dynamic adjustments of described current environment, the detection range after adjusted;
Describedly judge whether described distance is greater than default detection range, comprising: judge described distance whether be greater than described adjustment after detection range.
In conjunction with the first or the second of first aspect or first aspect or the third or the 4th kind of possible enforcement side, the embodiment of the present invention additionally provides the 5th kind of possible embodiment of first aspect, and described method also comprises:
Described anti-losing device sends the first wireless signal to described wireless signal transceiver;
If in the setting-up time section after sending described first wireless signal, described anti-losing device does not receive the first wireless signal that described wireless signal transceiver sends, and the described first wireless signal strength value obtained is zero, then send alerting signal.
Second aspect, embodiments provides a kind of anti-losing device, is applied to anti-lose system, and described anti-lose system comprises the wireless signal transceiver carrying out address binding with described anti-losing device, and described anti-losing device comprises:
Signal strength values obtains unit, for obtaining the first signal strength values of the first wireless signal that described wireless signal transceiver sends;
Distance exam unit, for calculating according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver;
Alarm unit, for judging whether described distance is greater than default detection range, if so, then sends alerting signal.
In conjunction with second aspect, embodiments provide the first possible embodiment of second aspect, wherein,
Described signal strength values obtains unit, also for obtaining the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends; The frequency of described first wireless signal is lower than the frequency of described second wireless signal;
Described anti-losing device also comprises:
Signal attenuation coefficient measuring and calculating unit, for obtaining the signal attenuation coefficient of current environment according to described secondary signal intensity level measuring and calculating;
Detection range regulon, for described current environment signal attenuation coefficient dynamic adjustments described in preset detection range, the detection range after adjusted;
Described distance exam unit is used for, and calculates according to the signal attenuation coefficient of described current environment and described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver;
Described alarm unit is used for, judge described distance that described distance exam unit calculates whether be greater than described adjustment after detection range, if so, then send alerting signal.
The third aspect, the embodiment of the present invention additionally provides a kind of anti-lose system, comprises the anti-losing device and wireless signal transceiver that mutually carry out address binding, wherein,
Described wireless signal transceiver, for sending the first wireless signal to described anti-losing device at set intervals;
Described anti-losing device, for obtaining the first signal strength values of described first wireless signal that described wireless signal transceiver sends;
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to described first signal strength values;
Judge whether described distance is greater than default detection range, if so, then send alerting signal.
In conjunction with the third aspect, embodiments provide the first possible embodiment of the third aspect, wherein,
Described wireless signal transceiver, also for sending the second wireless signal to described anti-losing device; The frequency of described first wireless signal is lower than the frequency of described second wireless signal;
Described anti-losing device, also for obtaining the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends; The signal attenuation coefficient of current environment is obtained according to described secondary signal intensity level measuring and calculating; The detection range preset according to the signal attenuation coefficient dynamic adjustments of described current environment, the detection range after adjusted;
Describedly calculate according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver, comprising:
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to the signal attenuation coefficient of described current environment and described first signal strength values;
Describedly judge whether described distance is greater than default detection range, comprising: judge described distance whether be greater than described adjustment after detection range.
The anti-lost method that the embodiment of the present invention provides, Apparatus and system, by mutually carrying out anti-losing device and the wireless signal transceiver of address binding, first signal strength values of the first wireless signal that anti-losing device sends according to the wireless signal transceiver obtained, calculate distance between the two, alerting signal is sent when judging that distance is between the two greater than default detection range, monitored object is searched in time to point out monitored object, lose for preventing monitored object and provide reliable guarantee, improve the problem that current monitored object is easily lost.
Further, the anti-lost method that the embodiment of the present invention provides, Apparatus and system, by the signal attenuation coefficient dynamic adjustments detection range according to current environment, further increase the practicality of anti-losing device, reliability and stability, avoid and to cause because of environmental change anti-losing device can not the problem of effectively anti-lost or wrong report.
Further, the anti-lost method that the embodiment of the present invention provides, Apparatus and system, utilize high-frequency wireless signal to the susceptibility of environmental change, the long transmission distance of low-frequency wireless signal, reach tending towards stability property of signal attenuation coefficient after certain distance, the measuring and calculating of signal attenuation coefficient and distance exam is carried out respectively by adopting a high-frequency wireless signals and a low-frequency wireless signals, by the detection range preset according to current signal attenuation coefficient dynamic adjustments, not only increase anti-lost monitoring distance, further improves anti-lost accuracy, reduce rate of false alarm, and ensured human-body safety.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the flow process of a kind of anti-lost method that the embodiment of the present invention provides;
Fig. 2 shows the flow process of another anti-lost method that the embodiment of the present invention provides;
Fig. 3 shows the structure of the anti-losing device that the embodiment of the present invention provides;
Fig. 4 shows the structure of a kind of anti-losing device that the embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Wireless signal can produce decay in transmitting procedure, and the distance of transmission is larger, and signal attenuation is larger, and the intensity of the wireless signal received is more weak.Based on this principle, embodiments provide a kind of anti-lost method, Apparatus and system, apply this anti-lost method and device and can improve child/old man and to go astray from the group, improve the problem of stolen property.
The anti-lost method that the embodiment of the present invention provides and application of installation are in anti-lose system.In anti-lose system, the anti-losing device that the embodiment of the present invention provides can supporting with wireless signal transceiver (carry out address binding, the destination address of wireless signal transceiver is the address of this anti-losing device) use.Wireless signal transceiver can be independently wireless signal transceiver, and can be the wireless signal transceiver module be built in the terminals such as mobile phone, also can be the anti-losing device that the embodiment of the present invention provides.The anti-losing device that the embodiment of the present invention provides can carry out address binding with a wireless signal transceiver, also address binding can be carried out with multiple wireless signal transceiver, the monitored object that multiple wireless signal transceiver is respectively different held, anti-losing device is held by monitored object, realizes a monitored object and guards multiple monitored object simultaneously.
If the anti-losing device that wireless signal transceiver adopts the embodiment of the present invention to provide, the anti-lose system that then embodiment of the present invention provides comprises at least two anti-losing devices, one of them anti-losing device (the second anti-losing device) is held by monitored object, remaining anti-losing device (the first anti-losing device) is held by monitored object, and the first anti-losing device and the second anti-losing device carry out address binding.
The anti-lose system that the embodiment of the present invention provides, the principle that the signal strength values RSSI of employing wireless signal carries out finding range realizes anti-lost, improves the problem that current monitored object is easily lost.The second anti-losing device that the first anti-losing device that monitored object is held is held to monitored object sends wireless signal, second anti-losing device receives the wireless signal that the first anti-losing device sends, and the second anti-losing device can calculate the distance d between the first anti-losing device and the second anti-losing device according to d=10^ ((ABS (RSSI)-A)/(10*n)) formula.Wherein, d is the distance between the first anti-losing device and the second anti-losing device, RSSI is the signal strength values of the wireless signal that the first anti-losing device of the second anti-losing device reception sends, the signal intensity (fixed value of having tested of dispatching from the factory) that A is the distance of wireless signal between the first anti-losing device and the second anti-losing device that the first anti-losing device sends when being one meter, n is the signal attenuation coefficient of environment to wireless signal, drawing according to the experimental test carried out in advance, is preset value.ABS () is the function that takes absolute value.As long as the signal intensity RSSI value of the wireless signal that the first anti-losing device therefore obtaining the second anti-losing device reception in real time sends can calculate distance between the two.
Apply above-mentioned range measurement principle and can carry out anti-lost monitoring.When applying above-mentioned range measurement principle and carrying out anti-lost monitoring, if the distance d calculated is greater than default detection range, second anti-losing device then sends alerting signal, detection range is exceeded to point out the monitored object of monitored object, be convenient to monitored object and search monitored object in time, and then can prevent monitored object from losing.The embodiment of the present invention is based on wireless signal range measurement principle, and the anti-lose system provided effectively can improve the problem that current monitored object is easily lost, and loses provide a kind of possible technical guarantee for preventing monitored object.
Consult Fig. 1, the anti-lost method that the embodiment of the present invention provides, be applied in anti-lose system, described anti-lose system comprises anti-losing device, carries out the wireless signal transceiver of address binding with described anti-losing device.Anti-losing device is herein held by monitored object, wireless signal transceiver is held by monitored object, wireless signal transceiver can send wireless signal to anti-losing device within the time interval (such as 500ms) of setting, the anti-lost method provided by the embodiment of the present invention realizes the real-time monitoring of monitored object to monitored object, prevents monitored object from losing.The implication of address binding is that the destination address of wireless signal transceiver is associated with the receiver address of this anti-losing device herein, that is to say, the destination address of wireless signal transceiver is the address of this anti-losing device, and this anti-losing device receives the wireless signal launched with the wireless signal transceiver of its binding.
The anti-lost method that the embodiment of the present invention provides, comprising:
Step S101: described anti-losing device obtains the first signal strength values of the first wireless signal that described wireless signal transceiver sends.Wireless signal transceiver can send the first wireless signal to anti-losing device within the time interval (such as 500ms) of setting, anti-losing device can receive this first wireless signal, obtains the first signal strength values of the first wireless signal that wireless signal transceiver sends.
Step S102: anti-losing device is according to described first signal strength values obtained, utilize d=10^ ((ABS (RSSI)-A)/(10*n)), calculate the distance d between anti-losing device and wireless signal transceiver.When carrying out distance exam, what signal attenuation coefficient n adopted is draw value through overtesting measuring and calculating under the environment (being also the environment often used) of routine.
Step S103: whether anti-losing device judging distance d is greater than default detection range D, provides judged result.
Step S104: if distance d is greater than default detection range D, then send alerting signal.Alerting signal can be voice signal, light signal, or the combination of voice signal and light signal.
Anti-losing device can be held by monitored object, and wireless signal transceiver is held by monitored object.If the distance d between the wireless signal transceiver that monitored object is held and the anti-losing device that monitored object is held is beyond the detection range scope preset, then send alerting signal, to point out monitored object to search monitored object in time, in case monitored object is lost.In the detection range preset, monitored object can be in monitored object within sweep of the eye, and monitored object is easier to the monitored object of Timeliness coverage, so that monitored object can search rapidly monitored object when sending alerting signal.Preferably, detection range is less than 120 meters.The anti-lost method that the present embodiment provides effectively can improve the problem that monitored object is lost.
Monitored object is behaved, and monitored object can be people also can be thing, and monitored object realizes the monitoring to monitored object by anti-losing device, prevents monitored object from losing.When monitored object is behaved, monitored object holds wireless signal transceiver; If when monitored object is thing, wireless signal transceiver is connected with monitored object or is placed in monitored object inside, such as, wireless signal transceiver is placed in wallet, or wireless signal transceiver is built in mobile phone (can be directly wireless signal transmitting module built-in in mobile phone).
Wireless signal transceiver can be independently wireless signal transceiver, and also can be built in the wireless signal transmitting module in the terminals such as mobile phone, also can be the anti-losing device that the present embodiment provides.If the anti-losing device that wireless signal transceiver adopts the embodiment of the present invention to provide, so anti-losing device has wireless signal transmission function, sends the first wireless signal to the other side.When distance between two anti-losing devices is greater than default detection range, two anti-losing devices all can send alerting signal, the anti-losing device that monitored object is held sends alerting signal, the people of monitored data collection can be pointed out to note, to give a hand, be also convenient to monitored object and a little find monitored object more fast according to sending of alerting signal.
Such as, monitored object A holds an anti-losing device (being called the first anti-losing device), and monitored object B holds another anti-losing device (being called the second anti-losing device).For convenience of using, before dispatching from the factory, the first anti-losing device and the second anti-losing device carry out address binding, and the first anti-losing device and the second anti-losing device can send wireless signal to the other side mutually, also can receive the wireless signal that the other side sends.The second anti-losing device transmission frequency that the wireless signal transceiver of the first anti-losing device that monitored object A holds is held to monitored object B every 500ms is the wireless signal of 915MHz, and the second anti-losing device that monitored object B holds is the wireless signal of 915MHz every 500ms to the first anti-losing device transmission frequency.Second anti-losing device can calculate the distance d between the first anti-losing device and the second anti-losing device according to the signal strength values obtained, if distance d is greater than default detection range D, send the voice signal of 60 decibels, search monitored object in time to point out monitored object.First anti-losing device then sends the voice signal of 60 decibels when being greater than default detection range D according to the signal strength values of the activity distance d calculated between the two, note to point out the people of monitored data collection and offer help.
By the anti-lost method that the embodiment of the present invention provides, can effectively realize anti-lost monitoring, protect monitored object to avoid losing.
Under the environment of spaciousness, monitored object can search monitored object (namely monitored object at monitored object within sweep of the eye) in the detection range preset, so that when the distance between monitored object and monitored object exceedes detection range, monitored object can the monitored object of Timeliness coverage.But under complex environment, under the environment that the shelter (people or thing) namely between monitored object and monitored object is more, due to blocking of shelter, monitored object is not easy to find monitored object.That is to say, under complex environment, within the scope of the detection range preset under spacious environment, monitored object is not easy to find monitored object, and monitored object also exists risk of missing.
Shelter is more, and the decay of transmission of wireless signals is more severe, and the signal intensity of the wireless signal received is more weak.Based on this principle, in order to improve anti-lost effect further, as one preferably embodiment, the anti-lost method that the embodiment of the present invention provides, can also comprise:
The detection range that dynamic adjustments is preset, the detection range after adjusted.If current environment complexity, shortens detection range, if current environment spaciousness, extend detection range.After the detection range dynamic adjustments preset, when carrying out alarm decision, whether judging distance d is greater than the detection range after adjustment, if it is sends alerting signal.
The implementation of the detection range that dynamic adjustments is preset can have multiple, such as, and manual adjustments.Manual adjustments also can have various ways, and such as, monitored object is according to checking that the number of shelter (comprising people and thing) carries out detection range adjustment under current environment.And for example, anti-losing device has display screen, the signal strength values of the wireless signal that the other side obtained sends is with numeral or figure (such as bar shaped lattice) display in display screen, and monitored object is by checking that the signal strength values in display screen carrys out manual adjustments detection range.
As one preferably embodiment, anti-losing device can regulate default detection range automatically.Consult Fig. 2, embodiments provide another kind of anti-lost method, comprising:
Step S201: anti-losing device obtains the first signal strength values of the first wireless signal that described wireless signal transceiver sends, and the secondary signal intensity level of the second wireless signal of wireless signal transceiver transmission.Wherein, the frequency of the first wireless signal is lower than the frequency of the second wireless signal.Optionally, the frequency of the first wireless signal is 915MHz, and the frequency of described second wireless signal is 1GHz.
Step S202: anti-losing device obtains the signal attenuation coefficient of current environment according to the measuring and calculating of secondary signal intensity level.Herein, when calculating the signal attenuation coefficient of current environment, a known value that what distance d in formula d=10^ ((ABS (RSSI)-A)/(10*n)) adopted is, this value can be frontly once calculate the distance between anti-losing device and wireless signal transceiver obtained.Easy understand, in certain distance variation range, environment may not change, signal attenuation coefficient may identical (such as distance be between the two changed to 35 meters by 30 meters, actual environment does not have any change, namely signal attenuation coefficient is consistent), and the speed of human body walking be about 1.5m/s, anti-losing device can be calculated every 500ms and obtains a distance (namely within the time that twice measuring and calculating obtains distance potential range change be only 0.75 meter), therefore before adopting once or frontly calculate the degree of accuracy that the distance obtained does not affect the signal attenuation coefficient of the current environment of measuring and calculating completely several times, the degree of accuracy calculating the signal attenuation coefficient of the current environment obtained is high.Based on this, wireless signal transceiver can send the first wireless signal and the second wireless signal simultaneously, and certain also can not simultaneously send.
Step S203: the signal attenuation coefficient of the current environment that anti-losing device obtains according to measuring and calculating, the detection range that dynamic adjustments is preset, the detection range after adjusted.
Be pre-stored with in anti-losing device and show according to the signal attenuation coefficient repeatedly testing gained is under various circumstances corresponding with detection range, as shown in table 1.Preferably, detection range is 5-120 rice, and table 1 is only schematically represent the corresponding relation between signal attenuation coefficient and detection range preset, and is not used in limit detection range and signal attenuation coefficient only can be divided into five kinds of corresponding relations.
Table 1:
When signal attenuation coefficient changes from small to big (showing as the signal intensity of the wireless signal of reception by dying down by force), shorten detection range; Or, when signal attenuation coefficient from large to small (signal intensity showing as the wireless signal received changes from weak to strong) time, extend detection range.
During concrete adjustment, after anti-losing device calculates the signal attenuation coefficient n under current environment, which signal attenuation coefficient that the signal attenuation coefficient n judging under current environment is contained in table 1 is interval, according to the signal attenuation coefficient n under current environment in Table 1 belonging to the interval dynamic adjustments detection range of signal attenuation coefficient.Such as, belonging to the signal attenuation coefficient n under current environment, signal attenuation coefficient interval is 0.9n3 ~ 1.1n3, then regulate default detection range to be D3.Whether judging distance d is greater than D3, if so, then sends alerting signal.
Such as, under monitored object A and monitored object B is currently located at spacious environment, the detection range preset is 50 meters.Along with the movement of monitored object A and monitored object B, be moved in the crowded crowd of the stream of people.In crowd, monitored object A is easily blocked by the crowded stream of people and disappears in the field range of monitored object B, easily loses.Therefore, now the second anti-losing device of holding of monitored object B can dynamic adjustments detection range according to the current signal attenuation coefficient calculated, shorten detection range, such as detection range foreshortens to 20 meters from 50 meters, if the distance between monitored object A and monitored object B is more than 20 meters, then the second anti-losing device that monitored object B holds sends alerting signal.Monitored object A and monitored object B continues mobile, under it moves to again comparatively spacious environment, because shelter reduces, the signal intensity of the wireless signal received strengthens, if detection range is still 20 meters, then may lose the meaning (within the scope of 20 meters, monitored object can very easily find monitored object at any time, without the need to carrying out anti-lost alarm) of anti-losing device.Therefore, now the second anti-losing device dynamic adjustments detection range of holding of monitored object B, extend adjustable range, such as adjustable range extends to 40 meters from 20 meters, if the distance between monitored object A and monitored object B is more than 40 meters, the second anti-losing device that monitored object B holds just sends alerting signal.
Shelter is more, and the visual field of monitored object is more easily stopped, monitored object is more easily lost.The anti-lost method that the embodiment of the present invention provides, detection range can according to the signal intensity of the wireless signal received, namely dynamic adjustments is carried out according to concrete applied environment (the signal attenuation coefficient under current environment), improve the practicality of anti-lost method and device, reliability and stability, avoid to cause because of environmental change can not be effectively anti-lost problem.
Step S204: anti-losing device calculates according to the signal attenuation coefficient of described current environment and described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver.When carrying out distance exam herein, the signal attenuation coefficient that what n in formula d=10^ ((ABS (RSSI)-A)/(10*n)) adopted is under current environment, make the precision calculating the distance obtained higher, and then make the monitoring precision of anti-method higher.
Step S205: judge described distance whether be greater than described adjustment after detection range, provide judged result.
Step S206: if described judged result is yes, then send alerting signal.
The anti-lost method that the embodiment of the present invention provides, obtains two signal strength values by the wireless signal receiving two different frequencies, calculates the signal attenuation coefficient obtaining current environment, improve the accuracy of signal attenuation coefficient with this; Detection range dynamic change according to the signal attenuation coefficient under real time environment, improves dirigibility and the practicality of alarm decision; Distance between anti-losing device and wireless signal transceiver is calculated according to the signal attenuation coefficient under real time environment and is obtained, and also improves because signal attenuation coefficient to change the precision of the distance exam caused with environmental change.In brief, the anti-lost method provided by the embodiment of the present invention, greatly improves the dirigibility of anti-lost monitoring, practicality and accuracy.
Radio signal frequency is higher is more responsive to environmental change, its signal attenuation index variation is more obvious, therefore high-frequency wireless signal can be utilized to test the signal attenuation coefficient (namely judging the complexity of current environment) under current environment, and then according to the detection range that current signal attenuation coefficient adjustment is preset, to make anti-lost monitoring accuracy higher.Therefore the anti-lost method that the embodiment of the present invention provides calculates current signal attenuation coefficient by second wireless signal of 1GHz, and then according to the detection range that current signal attenuation coefficient adjustment is preset, to improve anti-lost monitoring accuracy.Certain, except the wireless signal of 1GHz, the second wireless signal also can adopt a little less than or higher than the wireless signal of 1GHz.
In order to improve the transmission range of wireless signal, can be realized by the emissive power improving wireless signal.But due to anti-losing device by monitored object (people) is held, if improve the emissive power, particularly high-frequency wireless signal of wireless signal, so the radiation that brings of this wireless signal is also larger, may damage human body.Therefore, in order to ensure that anti-losing device can not damage human body, common, the emissive power of wireless signal controls in milliwatt level.
But the emissive power of wireless signal controls in milliwatt level, causes the transmission range of high-frequency wireless signal shorter, limits the monitoring distance of anti-losing device.Therefore, preferably, the anti-lost method that the embodiment of the present invention provides, adopts the distance exam that low-frequency first wireless signal carries out between anti-losing device and wireless signal transceiver, to realize the monitoring distance improving anti-losing device when ensureing anti-lost monitoring accuracy.The wireless signal of the preferred 915MHz of low-frequency first wireless signal, the wireless signal of 915MHz is the public frequency band signal of the cleanest (being not easily disturbed).Certain, the first wireless signal can adopt the wireless signal of other frequency ranges, the wireless signal of such as 315 ~ 915MHz.
It should be noted that, utilize the object of high-frequency second wireless signal to be utilize it to the high sensitivity of environmental change to calculate the signal attenuation coefficient under varying environment.Although the transmission range of high-frequency wireless signal is shorter, but it is highly sensitive, even if distant namely between anti-losing device and wireless signal transceiver, anti-losing device also may can obtain the signal strength values of the second wireless signal that wireless signal transceiver sends, and carries out the measuring and calculating of signal attenuation coefficient.Due to when distance reaches certain limit, signal attenuation coefficient almost tends towards stability, even if therefore secondary signal intensity level can not be obtained, under larger distance, value during signal attenuation coefficient stabilization still can be adopted to carry out distance exam, do not affect estimation precision completely.
The anti-lost method that the embodiment of the present invention provides, utilize high-frequency wireless signal to the long transmission distance of the susceptibility of environmental change, low-frequency wireless signal, reach tending towards stability property of signal attenuation coefficient after certain distance, the measuring and calculating of signal attenuation coefficient and distance exam is carried out respectively by adopting the wireless signal of two different frequencies, by the detection range preset according to current signal attenuation coefficient dynamic adjustments, not only increase anti-lost monitoring distance, also improve anti-lost accuracy, reduce rate of false alarm, and ensure human-body safety.
Optionally, the anti-lost method that the embodiment of the present invention provides, can also comprise:
Anti-losing device sends the first wireless signal to described wireless signal transceiver; Judge in the setting-up time section after sending the first wireless signal, whether anti-losing device receives the first wireless signal that wireless signal transceiver sends, if not, and the first signal strength values of the first wireless signal that the wireless signal transceiver obtained sends is zero, then send alerting signal.Anti-losing device does not receive the first wireless signal that wireless signal transceiver sends, and the first signal strength values of the first wireless signal that the wireless signal transceiver obtained sends is zero (if the first wireless signal is highly sensitive, even if anti-losing device does not receive the first wireless signal that wireless signal transceiver sends, also non-vanishing first signal strength values may be obtained, signal strength values be retrieved as existing mature technology, carefully do not state), illustrate that wireless signal transceiver does not send the first wireless signal, may fault be there is.
Only normally could carry out Signal transmissions between the two when anti-losing device or wireless signal transceiver do not break down.In the method that the embodiment of the present invention provides, connect detect by carrying out link, judge to detect anti-losing device or wireless signal transceiver whether malfunction monitoring, safeguard in time when a failure occurs or replacing, to ensure that anti-lost monitoring is reliably carried out.
Optionally, at employing two wireless signals to carry out in the scheme of signal attenuation coefficient and distance exam, can also adopt and otherwise realize:
Wireless signal transceiver sends the first wireless signal and the 3rd wireless signal to anti-losing device, the first wireless signal different with the frequency of the 3rd wireless signal (to avoid mutual interference) simultaneously.Anti-losing device obtains the first signal strength values and the 3rd signal strength values, can calculate obtain the signal attenuation coefficient of current environment and the distance between described anti-losing device and described wireless signal transceiver according to the first signal strength values and the 3rd signal strength values.Such as, the signal attenuation coefficient n of distance d between anti-losing device and wireless signal transceiver and current environment can be calculated according to d=10^ ((ABS (RSSI1)-A)/(10*n)) by RSSI1 and RSSI2; Wherein, RSSI1 is the signal strength values of the first wireless signal that the wireless signal transceiver of anti-losing device acquisition sends, and RSSI2 is the signal strength values of the second wireless signal that the wireless signal transceiver of anti-losing device acquisition sends.
Consult Fig. 3, the embodiment of the present invention additionally provides a kind of anti-losing device, is applied in anti-lose system, and described anti-lose system comprises the wireless signal transceiver carrying out address binding with described anti-losing device.Anti-losing device comprises:
Signal strength values obtains unit 301, for obtaining the first signal strength values of the first wireless signal that described wireless signal transceiver sends.
Distance exam unit 302, for calculating according to described first signal strength values the distance d obtained between described anti-losing device and described wireless signal transceiver.
Whether alarm unit 305, be greater than default detection range D for judging distance d, if it is send alerting signal.Alerting signal can be voice signal, light signal, or sound and light signal.
Preferably, anti-losing device can also comprise: detection range regulon 304, for the detection range preset according to dynamic adjustments, and the detection range after adjusted.Detection range regulon 304 can regulate according to the data of the monitored object input received the detection range preset.Optionally, detection range regulon 304 also can regulate default detection range automatically.Now,
Described signal strength values obtains unit 301, also for obtaining the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends; The frequency of described first wireless signal is lower than the frequency of described second wireless signal.
Anti-losing device also comprises:
Signal attenuation coefficient measuring and calculating unit 303, for obtaining the signal attenuation coefficient of current environment according to described secondary signal intensity level measuring and calculating.
Detection range regulon 304, for calculating the signal attenuation coefficient n of the current environment obtained, the detection range that dynamic adjustments is preset, the detection range after adjusted according to described signal attenuation coefficient measuring and calculating unit 303.Regulative mode refers to the associated description in preceding method embodiment.
Now, described distance exam unit 302 for, calculate according to the signal attenuation coefficient of described current environment and described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver.
Described alarm unit 305 for, judge described distance that described distance exam unit calculates whether be greater than described adjustment after detection range, if so, then send alerting signal.
The anti-losing device that the embodiment of the present invention provides, by judging whether the distance between monitored object and monitored object exceeds default detection range, and the distance between monitored object and monitored object sends alerting signal when exceeding default detection range, to point out monitored object to search monitored object in time, lose for preventing monitored object and provide reliable guarantee.
Detection range can carry out dynamic adjustments according to the signal attenuation coefficient of current environment, namely dynamic adjustments is carried out according to concrete applied environment, further increase the practicality of anti-losing device, reliability and stability, improve and to cause the problem that anti-losing device can not be effectively anti-lost because of environmental change.
Consult Fig. 4, the alternatively form of expression, the embodiment of the present invention additionally provides a kind of anti-losing device, comprise wireless signal receiver 401, microcontroller 402, alarm 403 and power supply 404, microcontroller 402 is connected with wireless signal receiver 401, alarm 403 and power supply 404 respectively, and power supply is wireless signal receiver 401, microcontroller 402, alarm 403 provide electric energy.Wherein,
Wireless signal receiver 401, for obtaining the first signal strength values of the first wireless signal that described wireless signal transceiver sends.
If be that multiple anti-losing device carries out address binding mutually in anti-lose system, so wireless signal receiver can also be used for sending the first wireless signal and/or the second wireless signal to other the anti-losing device carrying out address binding with it.
The implication of address binding is herein that the destination address of wireless signal transceiver is associated with the receiver address of this anti-losing device, that is to say, the destination address of wireless signal transceiver is the address of this anti-losing device, and this anti-losing device receives the wireless signal launched with the wireless signal transceiver of its binding.
Microcontroller 402, for calculating according to d=10^ ((ABS (RSSI)-A)/(10*n)) and described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver.Whether judging distance d is greater than default detection range D, provides judged result.
As one preferably embodiment, wireless signal receiver 401 also can also for obtaining the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends.The frequency of the first wireless signal is lower than the second wireless signal.
Microcontroller 402 also can also for obtaining the signal attenuation coefficient of current environment according to described secondary signal intensity level measuring and calculating; The detection range preset according to the signal attenuation coefficient dynamic adjustments of described current environment, the detection range after adjusted; The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to the signal attenuation coefficient of described current environment and described first signal strength values; Judge described distance whether be greater than adjustment after detection range, provide judged result.
Alarm 403, for sending alerting signal when the judged result that microcontroller 402 provides is for being.Alarm can be hummer, can be pilot lamp, also can be the combination of hummer and pilot lamp.
Power supply 404, for providing electric energy to wireless signal receiver 401, microcontroller 402, alarm 403.Power supply 404 can be dry cell, also can be chargeable lithium cell.
The anti-losing device that the embodiment of the present invention provides, its form of expression can have multiple, such as, sets up a watchband and is made as the watch be worn on hand, or sets up a chaining and be made as the necklace hung on neck.The anti-losing device that the embodiment of the present invention provides not only can carry out anti-lost early warning, also can be used as ornament and uses, increase attractive in appearance after being made as watch or necklace.
The anti-losing device that the embodiment of the present invention provides, anti-lost method, its technique effect realizing principle and generation is identical with aforementioned anti-lost method embodiment, for concise and to the point description, anti-losing device and the not mentioned part of system embodiment part, can with reference to corresponding contents in aforementioned anti-lost method embodiment.
In all examples be illustrated and described herein, any occurrence should be construed as merely exemplary, instead of as restriction, therefore, other examples of exemplary embodiment can have different values.
Method flow diagram in accompanying drawing and device block diagram show device according to multiple embodiment of the present invention, the architectural framework in the cards of method and computer program product, function and operation.In this, each square frame in method flow diagram or device block diagram can represent a part for module, program segment or a code, and a part for described module, program segment or code comprises one or more executable instruction for realizing the logic function specified.Also it should be noted that at some as in the realization of replacing, the function marked in square frame also can be different from occurring in sequence of marking in accompanying drawing.Such as, in fact two continuous print square frames can perform substantially concurrently, and they also can perform by contrary order sometimes, and this determines according to involved function.Also it should be noted that, the combination of the square frame in each square frame in block diagram and/or process flow diagram and block diagram and/or process flow diagram, can realize by the special hardware based system of the function put rules into practice or action, or can realize with the combination of specialized hardware and computer instruction.
Those skilled in the art can be well understood to, for convenience and simplicity of description, the specific works process of the anti-losing device of foregoing description, method and unit (module), with reference to the corresponding process in aforementioned anti-lost method embodiment, can not repeat them here.
Each functional unit (module) in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.
If described function using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part of the part that technical scheme of the present invention contributes to prior art in essence in other words or this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, ROM (read-only memory) (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (10)
1. an anti-lost method, is characterized in that, is applied to anti-lose system, and described anti-lose system comprises the anti-losing device and wireless signal transceiver that mutually carry out address binding, and described anti-lost method comprises:
Described anti-losing device obtains the first signal strength values of the first wireless signal that described wireless signal transceiver sends;
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to described first signal strength values;
Judge whether described distance is greater than default detection range, if so, then send alerting signal.
2. method according to claim 1, is characterized in that, also comprises:
The detection range preset described in described anti-losing device dynamic adjustments, the detection range after adjusted;
Describedly judge whether described distance is greater than default detection range, comprising:
Judge described distance whether be greater than described adjustment after detection range.
3. method according to claim 2, is characterized in that, the detection range preset described in described dynamic adjustments, comprising:
Described anti-losing device obtains the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends; The frequency of described first wireless signal is lower than the frequency of described second wireless signal;
The signal attenuation coefficient of current environment is obtained according to described secondary signal intensity level measuring and calculating;
The detection range preset according to the signal attenuation coefficient dynamic adjustments of described current environment, the detection range after adjusted;
Describedly calculate according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver, comprising:
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to the signal attenuation coefficient of described current environment and described first signal strength values;
Describedly judge whether described distance is greater than default detection range, comprising: judge described distance whether be greater than described adjustment after detection range.
4. method according to claim 3, is characterized in that, the frequency of described first wireless signal is 915MHz, and/or the frequency of described second wireless signal is 1GHz.
5. method according to claim 1, is characterized in that, also comprises:
Described anti-losing device obtains the 3rd signal strength values of the 3rd wireless signal that described wireless signal transceiver sends simultaneously; Described first wireless signal and described 3rd wireless signal are respectively the wireless signal of different frequency;
Describedly calculate according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver, comprising:
According to described first signal strength values and described 3rd signal strength values, measuring and calculating obtains the signal attenuation coefficient of current environment and the distance between described anti-losing device and described wireless signal transceiver;
The detection range preset according to the signal attenuation coefficient dynamic adjustments of described current environment, the detection range after adjusted;
Describedly judge whether described distance is greater than default detection range, comprising: judge described distance whether be greater than described adjustment after detection range.
6. according to the method one of claim 1-5 Suo Shu, it is characterized in that, also comprise:
Described anti-losing device sends the first wireless signal to described wireless signal transceiver;
If in the setting-up time section after sending described first wireless signal, described anti-losing device does not receive the first wireless signal that described wireless signal transceiver sends, and the described first wireless signal strength value obtained is zero, then send alerting signal.
7. an anti-losing device, is characterized in that, is applied to anti-lose system, and described anti-lose system comprises the wireless signal transceiver carrying out address binding with described anti-losing device, and described anti-losing device comprises:
Signal strength values obtains unit, for obtaining the first signal strength values of the first wireless signal that described wireless signal transceiver sends;
Distance exam unit, for calculating according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver;
Alarm unit, for judging whether described distance is greater than default detection range, if so, then sends alerting signal.
8. anti-losing device according to claim 7, is characterized in that,
Described signal strength values obtains unit, also for obtaining the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends; The frequency of described first wireless signal is lower than the frequency of described second wireless signal;
Described anti-losing device also comprises:
Signal attenuation coefficient measuring and calculating unit, for obtaining the signal attenuation coefficient of current environment according to described secondary signal intensity level measuring and calculating;
Detection range regulon, for described current environment signal attenuation coefficient dynamic adjustments described in preset detection range, the detection range after adjusted;
Described distance exam unit is used for, and calculates according to the signal attenuation coefficient of described current environment and described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver;
Described alarm unit is used for, judge described distance that described distance exam unit calculates whether be greater than described adjustment after detection range, if so, then send alerting signal.
9. an anti-lose system, is characterized in that, comprises the anti-losing device and wireless signal transceiver that mutually carry out address binding, wherein,
Described wireless signal transceiver, for sending the first wireless signal to described anti-losing device at set intervals;
Described anti-losing device, for obtaining the first signal strength values of described first wireless signal that described wireless signal transceiver sends;
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to described first signal strength values;
Judge whether described distance is greater than default detection range, if so, then send alerting signal.
10. anti-lose system according to claim 9, is characterized in that,
Described wireless signal transceiver, also for sending the second wireless signal to described anti-losing device; The frequency of described first wireless signal is lower than the frequency of described second wireless signal;
Described anti-losing device, also for obtaining the secondary signal intensity level of the second wireless signal that described wireless signal transceiver sends; The signal attenuation coefficient of current environment is obtained according to described secondary signal intensity level measuring and calculating; The detection range preset according to the signal attenuation coefficient dynamic adjustments of described current environment, the detection range after adjusted;
Describedly calculate according to described first signal strength values the distance obtained between described anti-losing device and described wireless signal transceiver, comprising:
The distance obtained between described anti-losing device and described wireless signal transceiver is calculated according to the signal attenuation coefficient of described current environment and described first signal strength values;
Describedly judge whether described distance is greater than default detection range, comprising: judge described distance whether be greater than described adjustment after detection range.
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