Real time position correction to ground generated spacecraft eph

Details Real time position correction to ground generated spacecraft eph Real time position correction to ground generated spacecraft eph

1996-09-18

1999-01-19

Louis-Jacques, Jacques H.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Aeronautical vehicle

701221, 701226, 244164, 244165, 342352, 342354, G06F 770

Patent

active

058624953

ABSTRACT:
Real time correction to ground generated satellite ephemeris implements a reference trajectory management module (334), an error estimation module (336), an parameter calculation module (338) and a position information management module (340). The reference trajectory management module (334) accesses reference trajectory data such as ground generated ephemeris data which is uplinked to a spacecraft through a communications unit (312). The position information management module (340) accesses and interprets position information such as Global Positioning System (GPS) measurement data to provide measured spacecraft positions. The parameter calculation module (338) calculates spacecraft position and velocity from the reference trajectory data. The error estimation module (336) compares the measured and calculated positions to provide a position difference, smoothes the position difference to filter anomalous data, and provides a correction term for the determination of corrected spacecraft orbital parameters such as position and velocity. The time rate of change of the correction term may be used to provide additional correction to the orbital parameters.

REFERENCES:
patent: 4442491 (1984-04-01), Olhausen, Jr.
patent: 4912475 (1990-03-01), Counselman, III
patent: 4939663 (1990-07-01), Baird
patent: 5109346 (1992-04-01), Wertz
patent: 5430657 (1995-07-01), Kyrtsos
patent: 5528502 (1996-06-01), Wertz

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