Position determination and message transfer system employing...

Details Position determination and message transfer system employing... Position determination and message transfer system employing...

G - Physics

01

S

343/69

G01S 5/06 (2006.01) G01S 13/78 (2006.01) G01S 13/87 (2006.01) G01S 13/89 (2006.01) G01S 13/91 (2006.01)

Patent

CA 1313560

TITLE OF THE INVENTION: POSITION DETERMINATION AND MESSAGE TRANSFER SYSTEM EMPLOYING SATELLITES AND STORED TERRAIN MAP ABSTRACT OF THE DISCLOSURE: A radio position determination and message transfer system is implemented using a pair of satellites in geostationary orbit for relaying interrogation and reply signals between a ground station and a user-carried transceiver. The user position is calculated based on the arrival times of reply signals received at the ground station via the two satellites, the known transmission time of the interrogation signal from the ground station, and the user's elevation on the surface of the earth. The elevation is derived from a stored terrain map providing local terrain elevations at a plurality of points on the earth's surface. The stored terrain map allows accurate position fixes to be obtained for surface users regardless of the deviation of the local terrain from the spherical or ellipsoidal model of the earth's surface.

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