Satellite terminal position determination

Details Satellite terminal position determination Satellite terminal position determination

1998-04-06

2000-06-06

Tarcza, Thomas H.

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

Directive

Including a satellite

34235701, 34235706, 34235715, 701213, G01S 502, H04B 7185

Patent

active

060724307

ABSTRACT:
A terminal 44 44A 44B using standard navigational satellite 142 position determination to find its position on the surface of the earth 14, has its performance enhanced by being linked to a communications satellite system 10 38. In one variant, the communications satellite 10 broadcasts on each of a plurality of spot beams 30, each interactive with a different part of the earth, the broadcast indicating which navigational satellites 142 are accessible for a terminal within that beam 30. The terminal 44 44A 44B receives the broadcast and adjusts the navigational satellite receiver 174 to look for signals only from the nominated navigational satellites 142. In another variant, the communications satellite system 10 38 approximately measures the position of the terminal 44 44B and then informs the terminal 44 44B which navigational satellites are accessible from the terminal 44 44B, the navigational satellite receiver 174 again only looking for signals from the nominated navigational satellites 142. In both variants, the time required to establish a position is reduced by the navigational satellite receiver 174 not being required to listen for inappropriate or inaccessible navigational satellites 142.

REFERENCES:
patent: 5043736 (1991-08-01), Darnell et al.
patent: 5311194 (1994-05-01), Brown
patent: 5491636 (1996-02-01), Robertson et al.
patent: 5589836 (1996-12-01), Noetzel
patent: 5844521 (1998-12-01), Stephens et al.

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