Satellite ephemeris determination system using GPS tracking tech

Details Satellite ephemeris determination system using GPS tracking tech Satellite ephemeris determination system using GPS tracking tech

1996-05-15

1998-02-10

Tarcza, Thomas H.

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

Directive

Including a satellite

342352, 455 121, G15S 502

Patent

active

057174040

ABSTRACT:
A system (10) for providing ephemeris data of a medium to high orbit satellite (12) relative to the Earth (30), where the satellite (12) is in an orbit substantially greater than 20,000 kilometers. The inventive system (10) includes plural transmitters (14, 16, 18, 20, 22, and 24) located within 20,000 kilometers of the Earth for transmitting information relating to the ephemeris of each transmitter relative to the Earth and time. This information is received and processed onboard the satellite (12) to provide ephemeris data. In a specific implementation, the transmitters (14, 16, 18, 20, 22, and 24) are GPS transmitters. One or more of the transmitters may be a ground or air based pseudolite. The transmitters have a geometric dilution of precision of six or less. Each pseuodlite transmitter includes a power supply sufficient to ensure that the signal received by the medium to high orbit satellite is of sufficient signal strength (e.g., -170 dBw to -160 dBw). Using one or more GPS pseuodlites and one or more GPS satellite transmitters, the ephemeris of a high or medium orbit satellite may be fixed precisely, inexpensively, in real time in an autonomous manner.

REFERENCES:
patent: 4726224 (1988-02-01), D'Ausilio
patent: 4746976 (1988-05-01), Kamel et al.
patent: 5041833 (1991-08-01), Weinberg

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