Apparatus and method for autonavigation with one or more orbitin

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364449, 364460, 342358, 455 98, G06F16500, H04B 10105

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active

054900760

ABSTRACT:
A system of making satellite-to-ground range measurements, carrying out communications between a ground station and a constellation of autonavigating satellites, and using these range measurements to improve navigation accuracy is disclosed. The system comprises an anchor that is in a fixed position relative to the earth. The anchor implements a filtering algorithm to arrive at solutions for the satellites' positions based on measured satellite positions and predicted satellite positions. Each time a new measurement is received by the anchor an update is generated. In this manner the system is capable of updating satellite positions at a greater rate than similar prior art systems, thereby, decreasing the transient response associated with satellite delta-v maneuvers and decreasing the quantity of data that must be exchanged by the anchor and the satellites.

REFERENCES:
patent: 4494211 (1985-01-01), Schwartz
patent: 4918609 (1990-04-01), Yamawaki
patent: 5160935 (1992-11-01), Inamiya
patent: 5187805 (1993-02-01), Bertiger et al.
patent: 5267167 (1993-11-01), Glickman
patent: 5311194 (1994-05-01), Brown
An Autodop Algorithm for the Block IIR Autonav Capability: by Alison Brown, Institute of Navigation Satellite Division Technical Meeting 2D, Sep. 27-29, 1989 Colorado Springs, CO, pp. 291-293, Publisher: Washington, DC, Institute of Navigation.
Sensitivity Analysis of an Integrated Navstar GPS/INS Navigation System to Component Failure by H. M. Schwartz, The Journal of Navigation vol. 30 No. 4 pp. 325-337, Winter 1983-1984, Publisher: Royal Institute of Navigation.

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