Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1999-04-09
2000-12-19
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
34235701, 701213, H04B 7185
Patent
active
061632953
ABSTRACT:
Systems and methods are disclosed for ionospheric correction in a system employing a single GPS frequency receiver for determining the geographic location of an object on the earth's surface. The receiver receives signals transmitted at the GPS L.sub.1 frequency from at least first and second GPS satellites, the first and second satellites having respective orbital positions relative to the receiver such that the total electron count (TEC) contribution to ionoshperic interference to signals transmitted by the respective satellites and received by the receiver is approximately the same. Respective measured distances of the two satellites to the receiver are determined based on the actual signal transmission times. True distances of the respective satellites are then calculated based on the assumption that the TEC contribution to the interference from each satellite is approximately the same.
REFERENCES:
patent: 5831576 (1998-11-01), Sheynblat
patent: 5936572 (1999-08-01), Loomis et al.
patent: 6040798 (2000-03-01), Kinal et al.
patent: 6072428 (2000-06-01), Schipper et al.
Nagasamy Vijay
Sun James
Usman Mohammad
Phan Dao L.
Tarcza Thomas H.
VSIS, Inc.
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