Remote position determination

Details Remote position determination Remote position determination

1996-07-18

1997-09-09

Urban, Edward F.

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

455 131, 455 132, 455456, 340991, H04B 7185

Patent

active

056666470

ABSTRACT:
A constellation of satellites which are distributed around the earth serves as a communications infrastructure that supports autonomous position determination and reporting of that position to a remote location. Satellites continuously broadcast acquisition signals. Position determining units are remotely programmed to activate upon the occurrence of an activation event. If PDUs can capture an acquisition signal, then they engage in activities which lead to determining their position and they coordinate their communications with the requirements of the communications infrastructure. To determine position, a location pulse may be transmitted on a regular schedule. The location pulse is transported between a fast moving satellite and a PDU. The movement of the satellite causes different location pulses to have different propagation delays and Doppler characteristics. By analyzing changes in propagation delays and Doppler characteristics, a procedure determines a position for a PDU.

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The Evening Star's article "Satellite Will Track Herd of 7,000 Elk" Feb. 16, 1970.

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