Ambiguity resolution for ambiguous position solutions using sate

Details Ambiguity resolution for ambiguous position solutions using sate Ambiguity resolution for ambiguous position solutions using sate

1996-09-30

1999-07-06

Tarcza, Thomas

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

455 121, 455 131, 34235704, G01S 502, H04B 7185

Patent

active

059202840

ABSTRACT:
A system and method for resolving ambiguity in an ambiguous position solution for a user terminal position in a satellite communications system which includes a user terminal, at least one satellite, and a gateway communicating with the user terminal through the satellite. Each satellite has a plurality of satellite beams which each illuminate a region on the Earth in a known pattern relative to a satellite sub-track. A satellite beam illuminating the user terminal is identified along with its corresponding position relative to the sub-track. The orientations of possible user terminal positions and the identified beam relative to the satellite sub-track are compared to each other. Possible user terminal positions falling on an incorrect side of the sub-track from the detected beam illuminating the user terminal, are considered as incorrect solutions for that user terminal. The ambiguity solution can be determined using satellite identification and comparison elements in the user terminal, or at the gateway, in which case certain beam information is reported to the gateway. In further aspects of the invention, the beam being identified can be either a forward link or reverse link beam, or both, and each link has a different beam pattern.

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