CN104485945A - Device for implementing seamless conversion of radio frequency by using accurate phase control - Google Patents
Device for implementing seamless conversion of radio frequency by using accurate phase control Download PDFInfo
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- CN104485945A CN104485945A CN201410765646.9A CN201410765646A CN104485945A CN 104485945 A CN104485945 A CN 104485945A CN 201410765646 A CN201410765646 A CN 201410765646A CN 104485945 A CN104485945 A CN 104485945A
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Abstract
The invention discloses a device for implementing seamless conversion of radio frequency by using accurate phase control. The device comprises a first frequency signal input end, a second frequency signal input end, a phase measuring device, a frequency switching device, a control device and a signal output end. The device has the beneficial effects that a phase relation between in-use signals and redundancy signals is determined by a phase measuring manner; the phase change of frequency signals is within 10ns during conversion from the in-use signals to the redundancy signals even the phase relation between the in-use frequency signals and the redundancy signals is a constant value, so that the seamless frequency conversion is implemented. The device also has the advantages of being simple in structure, easy to operate and low in cost.
Description
Technical field
The present invention relates to frequency switching mechanism, particularly relate to and a kind ofly adopt the seamless device switched of precise phase control realization rf frequency.
Background technology
The safety and reliability of clock synchronization system is very important, and the time is continuous print is do not allow to interrupt, and the default time is inconceivable.In order to ensure the fail safe of time system, except the reliability in circuit and system and safety Design, most usual way is, some parts of repeated configuration system, when system jam, the parts of redundant configuration are got involved and are born the work of trouble unit, reduce the fault time of system, overcome the system time interruption that system causes due to certain parts or device fault.Clock synchronization system medium frequency source must be superfluous in design, because frequency source is the most critical unit of makeup time synchro system.Superfluous in design for frequency source, except when by frequency source fault, automatically switch to superfluous in the frequency source portion of configuration, can also when normal work according to frequency accuracy or user operate in and the superfluous frequency signal that carries out between frequency source switch, to improve precision and the reliability of clock synchronization system.
The superfluous key in design of frequency source is the switching technique of frequency source signal, and have two key points, one is the time of implementation of switching actuator, can be overcome by selector and solve; It two is, owing to being arbitrariness with frequency signal and the superfluous phase difference in frequency signal, the error that random error maximum like this will be a number of cycles, when the frequency values of standard-frequency signal is 10MHz, its maximum error of switching is 100ns, is unallowable in precise synchronization system.
Summary of the invention
Object of the present invention, be switch by precise phase control realization rf frequency signal is seamless, solve existing frequency switching mechanism when switching frequency, what the uncertainty due to its phase place produced switches error.
The present invention is achieved through the following technical solutions: adopt the seamless device switched of precise phase control realization rf frequency, comprise first frequency signal input part, second frequency signal input part, phase measurement device, frequency switching mechanism, control device and signal output part;
Phase measurement device comprises the first frequency divider, the second frequency divider and linear phase detector, the signal of the input access first frequency signal input part of the first frequency divider, output is connected to linear phase detector, the signal of the input access second frequency signal input part of the second frequency divider, output is connected to linear phase detector, and the output of linear phase detector is connected to control device;
The input of frequency switching mechanism connects first frequency signal input part and second frequency signal input part respectively, and its output connection signal output, exports through signal output part in order to select one of them input frequency signal;
First frequency signal input part and second frequency signal input part are all provided with a controllable time delay circuit, thus realize the phase control of input signal;
The output of control device connecting linear phase discriminator, in order to gather the phase demodulation voltage signal that linear phase detector produces, control device also connects the control end of controllable time delay circuit and frequency switching mechanism, in order to control the amount of delay of controllable time delay circuit, and control frequency switching device shifter carries out frequency error factor.
Two needs scramble signals, first by phase measurement device, its relative phase is accurately measured, according to phase measurement, carry out delay by the phase place of delay circuit to a road frequency signal to regulate, under the effect of control unit, measured again by measuring and adjusting, namely can by the phase control of two arbitrary frequency signals of signal phase in the scope of some demarcation.When switching, the maximum of its phase hit is exactly maximum scalar quantity.
The scope of the quantitative Δ Ф of the table in the present invention is:
5ns≤ΔФ≤15ns；
Maximum phase change so when frequency error factor: 15ns;
When perfect condition, with frequency signal and superfluous be completely equal in frequency signal:
With frequency (Vz)=ACOS (ω t+ θ z);
Superfluous in frequency (Vr)=BCOS (ω t+ θ r), Δ Ф=θ z-θ r;
By above formula, know, when perfect condition, passing through delays time to control by superfluous in signal, is to realize:
5ns≤ΔФ＝(θz－θr)≤15ns；
Nonideality, namely with frequency signal with superfluously there is frequency departure in frequency signal.Its frequency departure will make the phase place of two frequency signals change in time, and the size of variable quantity is directly proportional to frequency departure.But what use in clock synchronization system is all standard-frequency signal, and its frequency accuracy is very high, so the phase difference caused by frequency accuracy is negligible at short notice.
Suppose relative frequency precision: Δ F≤1E-10
The relative phase rate of change that frequency departure produces: 0.1ns/1S
Known by above formula, the phase place change greatly in 10 seconds is only 1ns, is obviously negligible to the precision of switching of 15ns, and the precision of the frequency source signal of being tamed by satellite-signal is especially far away higher than this precision, and its relative frequency difference is also just very little.So all satisfy the demand for perfect condition and nonideality the present invention.
Control device is connected respectively to phase measurement device, phase delaying device and frequency switching mechanism.During plant running, two-way input signal, one is primary input, another is input for subsequent use, control device receives the phase measurement data of measurement mechanism, according to phase data, when phase deviation exceeds the calibration amount of setting, by control lag device, change the phase mass of input frequency signal for subsequent use, then measure, when supposing that relative phase deviation meets the scope of calibration amount, just measure always, otherwise just enter horizontal phasing control.When there being foreign frequency to switch order, both carrying out phase place by frequency switching mechanism and switching.
Further, the output of above-mentioned linear phase detector is connected to control device by low pass filter, A/D converter successively.Linear phase detector exports two pulse signals relevant to frequency plot, by low pass filter, is converted to linear voltage, and the phase place of this linear voltage and two frequency signals is one_to_one corresponding, both: Δ Ф=T/V × Vx
In formula: T is the cycle time of input signal;
V is full scale voltage (zero degree is V0=0);
Vx is measuring voltage;
Above formula represents the phase place at input signal corresponding to Vx voltage.
A/D converter is connected to control device, measures the linear voltage that the output of linear phase detector is converted to by low-pass filtering, by the magnitude of voltage recorded, calculates the relative phase amount of two input signals.
Further, between the first above-mentioned frequency divider and linear phase detector, inverter is set, between second frequency divider and linear phase detector, inverter is set, inverter makes the phase measurement of the frequency signal of input linear phase discriminator control near 180 °, the zero degree overcoming phase discriminator and the nonlinearity erron met.
Further, above-mentioned controllable time delay circuit be one by gate circuit chain form can control hysteresis delay circuit, can control lag precision: 1ns.
Further, the first above-mentioned frequency divider and the second frequency divider all adopt two-divider, and the object of two signals being carried out simultaneously two divided-frequency process obtains the pulse signal that duty ratio is 50%, realize using inverter to ensure 180 ° of principles measured.
The invention has the beneficial effects as follows: by phase measurement means, determine the phase relation of two frequency signals, by phase place adjustment (delay technology) to a wherein road signal, make to calibrate in weight range in the phase relation of two frequency signals at one, the phase place that arrives most when the two-way frequency signal made is switched changes the scope being less than calibration amount, realize, without meeting frequency to switch, specifically having following advantage:
1, high-precision frequency accuracy is had to measure;
2, the time saltus step of radiofrequency signal when switching is overcome;
3, there is the frequency switching mechanism of locking-type;
4, circuit structure is simple, is easy to control and operation, and equipment cost is lower, has good reliability;
5, dynamic loop design overcomes the uncertainty and error that the change due to device and environment factor produces.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples:
As shown in Figure 1, adopt the seamless device switched of precise phase control realization rf frequency, comprise first frequency signal input part, second frequency signal input part, phase measurement device, frequency switching mechanism, control device and signal output part;
Phase measurement device comprises the first frequency divider, the second frequency divider and linear phase detector, the signal of the input access first frequency signal input part of the first frequency divider, output is connected to linear phase detector, the signal of the input access second frequency signal input part of the second frequency divider, output is connected to linear phase detector, and the output of linear phase detector is connected to control device;
The input of frequency switching mechanism connects first frequency signal input part and second frequency signal input part respectively, and its output connection signal output, exports through signal output part in order to select one of them input frequency signal;
First frequency signal input part and second frequency signal input part are all provided with a controllable time delay circuit, thus realize the phase control of input signal;
The output of control device connecting linear phase discriminator, in order to gather the phase demodulation voltage signal that linear phase detector produces, control device also connects the control end of controllable time delay circuit and frequency switching mechanism, in order to control the amount of delay of controllable time delay circuit, and control frequency switching device shifter carries out frequency error factor.
The output of linear phase detector is connected to control device by low pass filter, A/D converter successively.Between first frequency divider and linear phase detector, inverter is set, between the second frequency divider and linear phase detector, inverter is set.Controllable time delay circuit be one by gate circuit chain form can control hysteresis delay circuit.First frequency divider and the second frequency divider all adopt two-divider.A/D converter adopts 12 A/D converters, when signal frequency is 10MHz, and AD phase time Measurement Resolution: 0.0488ns, phase measurement accuracy meets the demands.
Switch as embodiment with two-way 10MHz frequency:
When the device is operated, the phase adjustment of phase-delay network is zero, the phase mass △ Ф of two-way input frequency signal when phase measurement device will measure this state, owing to embedded in an inverter in first frequency signal so satisfactory phase mass should be near 180 °.
If: △ Ф does not meet: 95ns≤Δ Ф≤115ns;
Under the effect of control unit, the retardation both by changing phase-delay network meets:
95ns≤ΔФ≤115ns；
When meeting above formula, frequency switching mechanism is when carrying out frequency and switching, and the phase hit of generation is satisfactory.
As mentioned above, just the present invention can be realized well.
Claims (5)
1. adopt the seamless device switched of precise phase control realization rf frequency, it is characterized in that: comprise first frequency signal input part, second frequency signal input part, phase measurement device, frequency switching mechanism, control device and signal output part;
Phase measurement device comprises the first frequency divider, the second frequency divider and linear phase detector, the signal of the input access first frequency signal input part of the first frequency divider, output is connected to linear phase detector, the signal of the input access second frequency signal input part of the second frequency divider, output is connected to linear phase detector, and the output of linear phase detector is connected to control device;
The input of frequency switching mechanism connects first frequency signal input part and second frequency signal input part respectively, and its output connection signal output, exports through signal output part in order to select one of them input frequency signal;
First frequency signal input part and second frequency signal input part are all provided with a controllable time delay circuit, thus realize the phase control of input signal;
The output of control device connecting linear phase discriminator, in order to gather the phase demodulation voltage signal that linear phase detector produces, control device also connects the control end of controllable time delay circuit and frequency switching mechanism, in order to control the amount of delay of controllable time delay circuit, and control frequency switching device shifter carries out frequency error factor.
2. the seamless device switched of employing precise phase control realization rf frequency according to claim 1, is characterized in that: the output of described linear phase detector is connected to control device by low pass filter, A/D converter successively.
3. the seamless device switched of employing precise phase control realization rf frequency according to claim 1, is characterized in that: arrange inverter between the first described frequency divider and linear phase detector, arrange inverter between the second frequency divider and linear phase detector.
4. the seamless device switched of employing precise phase control realization rf frequency according to claim 1, is characterized in that: described controllable time delay circuit be one by gate circuit chain form can control hysteresis delay circuit.
5. the seamless device switched of employing precise phase control realization rf frequency according to claim 3, is characterized in that: the first described frequency divider and the second frequency divider all adopt two-divider.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809279A (en) * | 2017-04-28 | 2018-11-13 | 展讯通信（上海）有限公司 | Duty-ratio calibrating circuit and rf terminal |
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| US5673006A (en) * | 1996-03-28 | 1997-09-30 | Hughes Electronics | Seamless switch-over frequency synthesizer |
| CN101079629A (en) * | 2006-05-23 | 2007-11-28 | 中兴通讯股份有限公司 | A digital phase lock device for seamless switching of SDH product clock board |
| CN103529689A (en) * | 2013-10-09 | 2014-01-22 | 上海微小卫星工程中心 | Main and standby satellite clock time frequency signal seamless switching device and method |
| CN104049525A (en) * | 2014-03-24 | 2014-09-17 | 成都可为科技发展有限公司 | Method for eliminating phase differences between multiple time input sources in clock |
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2014
- 2014-12-12 CN CN201410765646.9A patent/CN104485945B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5673006A (en) * | 1996-03-28 | 1997-09-30 | Hughes Electronics | Seamless switch-over frequency synthesizer |
| CN101079629A (en) * | 2006-05-23 | 2007-11-28 | 中兴通讯股份有限公司 | A digital phase lock device for seamless switching of SDH product clock board |
| CN103529689A (en) * | 2013-10-09 | 2014-01-22 | 上海微小卫星工程中心 | Main and standby satellite clock time frequency signal seamless switching device and method |
| CN104049525A (en) * | 2014-03-24 | 2014-09-17 | 成都可为科技发展有限公司 | Method for eliminating phase differences between multiple time input sources in clock |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809279A (en) * | 2017-04-28 | 2018-11-13 | 展讯通信（上海）有限公司 | Duty-ratio calibrating circuit and rf terminal |
| CN108809279B (en) * | 2017-04-28 | 2021-12-21 | 展讯通信（上海）有限公司 | Duty ratio calibration circuit and radio frequency terminal |
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Address after: No.1-3, floor 4, building 2, no.1366, middle section of Tianfu Avenue, Chengdu hi tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu, Sichuan 610000 Patentee after: CHENGDU COVE TECHNOLOGY CO.,LTD. Address before: 610000 No. 419, building 6, hi tech Incubation Park, No. 1480, north section of Tianfu Avenue, hi tech Zone, Chengdu, Sichuan Patentee before: CHENGDU COVE TECHNOLOGY Co.,Ltd. |
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