Position determination of spacecraft at Mars using earth-based differential tracking

Details Position determination of spacecraft at Mars using earth-based differential tracking Position determination of spacecraft at Mars using earth-based differential tracking

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992asdy.conf.1545k&link_type=abstract

IN: Astrodynamics 1991; Proceedings of the AAS/AIAA Astrodynamics Conference, Durango, CO, Aug. 19-22, 1991. Pt. 2 (A92-43251 18

Astronomy and Astrophysics

Astronomy

Doppler Effect, Interferometry, Navigation, Planetary Landing, Rangefinding, Roving Vehicles, Tracking (Position), Covariance, Mars Surface

Scientific paper

The presence of two or more landed or orbiting spacecraft at a planet provides the opportunity to perform extremely accurate earth-based navigation by simultaneously acquiring Doppler data and either Same-Beam Interferometry (SBI) or ranging data. Covariance analyses were performed to investigate the accuracy with which lander and rover positions on the surface of Mars can be determined. Simultaneous acquisition of Doppler and ranging data from a lander and rover over two or more days enables determination of all components of their relative position to under 20 m. Acquiring one hour of Doppler and SBI enables three-dimensional lander-rover relative position determination to better than 5 m. Twelve hours of Doppler and either SBI or ranging from a lander and a low circular or half synchronous circular Mars orbiter makes possible lander absolute position determination to tens of meters.

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