Method and system for the autonomous on-board determination of t

Details Method and system for the autonomous on-board determination of t Method and system for the autonomous on-board determination of t

1998-02-02

1999-11-16

Eldred, J. Woodrow

Aeronautics and astronautics

Spacecraft

With special crew accommodations

244164, 244176, B64G 136

Patent

active

059842385

ABSTRACT:
A system for autonomous on-board determination of the position of an earth orbiting satellite consists of a biaxially measuring earth sensor which defines the z-axis (yaw axis) of the satellite and of several biaxially measuring sun sensor measuring heads which are arranged on the satellite structure such that, with the exception of earth shadow phases, they supply a direction vector measurement. Out-of-plane movement of the satellite is propagated by means of a precise model of the satellite dynamics including natural disturbance forces and thrusts during maneuvers on board. In order to compensate sensor uncertainties and the effects of thermal deformations, the satellite orbit is precisely measured at regular intervals (approximately 3 months), and by means of this information, a calibration function (time function for a day) for compensating measured values is determined. The in-plane movement of the satellite is not only propagated, but the propagation is supported by measured data (estimation), and the effects of out-of-plane movement and thermal deformations are taken into account, by means of the data of the calibration function (k(t) or of the propagation out-of-plane movement.

REFERENCES:
patent: 5108050 (1992-04-01), Maute
patent: 5311435 (1994-05-01), Yocum et al.
patent: 5452869 (1995-09-01), Basuthakur et al.
patent: 5528502 (1996-06-01), Wertz
patent: 5546309 (1996-08-01), Johnson et al.
patent: 5865402 (1999-02-01), Fischer et al.

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