Satellite positioning system

Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite

Reexamination Certificate

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Details

C455S012100, C701S226000

Reexamination Certificate

active

06950060

ABSTRACT:
A satellite positioning system and method of maintaining the positioning and clock data of a satellite using as few as one or two monitoring stations is disclosed. Each satellite of the positioning system determines its own positioning and clock data relative to other satellites in a constellation. One or more satellite signal monitoring stations receive relative clock and positioning data from a plurality of satellites in the constellation. A constellation solution which is applicable to all of the satellites in the constellation is calculated by treating the constellation as a rigid body at a fixed point in time. The constellation solution is transmitted to a satellite of the constellation which disseminates the solution through a crosslink network within the constellation for use by each satellite to update its individual positioning and clock data as needed. Due to the stability of the position and clock measurements using the method of the present invention, satellite uploads need only occur for one satellite in a constellation once each two or more days rather than every day for every satellite as is conventionally done. The use of mobile monitoring stations and the capacity of the positioning system to assist in updating the position and clock data of satellites passing the constellation are disclosed. In particular embodiments of the invention, the satellite positioning system is configured as a global positioning system (GPS).

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