A terminal Global Positioning System (TGPS) adopting a real-time self Differential Global Positioning System (DGPS) is developed for positioning a moving station in a local area. This TGPS enables not only to minimize the error ranges without any additional expensive transmitting-receiving equipment,...http://www.google.co.uk/patents/US6704652?utm_source=gb-gplus-sharePatent US6704652 - Real time self differential global positioning system and method for a moving station in a local area, and terminal global positioning system using the same
