GPS relative position detection system
January 25, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3063048 Beacon tracking system Out-of-range personnel monitor and alarm Out-of-range personnel monitor and alarm Personal emergency locator system Position aided subscriber unit for a satellite cellular system Indicator apparatus for the recovery of skiers buried by avalanches Location monitoring system Positioning and displaying system Location detecting apparatus InventorAssigneeApplicationNo. 377973 filed on 01/25/1995US Classes:342/357.08, Determining relative position (e.g., distance or direction)701/213Using Global Positioning System (GPS)ExaminersPrimary: Blum, Theodore M.Attorney, Agent or FirmInternational ClassesH04B 007/185G01S 005/02 AbstractA system of devices both capable of receiving civilian GPS signals, but also capable of providing a relative distance and direction indication that is accurate to several meters. A first device would be capable of transmitting its GPS determined position to a second device. The second device would include a means for receiving the GPS determined position of the first device, and would also include means for calculating the relative distance and direction between the first and second devices. The system would further include the ability of the first device to selectively transmit telemetry at a desired frequency. By providing the second device with the ability to selectively tune a receiver to receive a telemetry signal broadcast by different devices, a distance and direction to a plurality of first devices is possible.Other References
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