초록 ▼

A method and apparatus for estimating attitude sensor bias in a satellite system uses attitude sensors and a spacecraft control processor. Attitude sensors provide output signals, which may contain bias. The present invention interprets the signals, determines the bias present in the signals, and ge

A method and apparatus for estimating attitude sensor bias in a satellite system uses attitude sensors and a spacecraft control processor. Attitude sensors provide output signals, which may contain bias. The present invention interprets the signals, determines the bias present in the signals, and generates an output signal to offset the bias in the signals from the attitude sensors, thereby leading to more accurate positioning of the satellite employing the present invention.

대표청구항 ▼

[ What is claimed is:] [1.] A spacecraft attitude sensor error correction apparatus comprising:an attitude sensor that generates attitude-related position information based on a position of said attitude sensor with respect to a reference object, wherein said attitude-related position information co

[ What is claimed is:] [1.] A spacecraft attitude sensor error correction apparatus comprising:an attitude sensor that generates attitude-related position information based on a position of said attitude sensor with respect to a reference object, wherein said attitude-related position information contains a measurement error;an attitude reference source that generates reference position information regarding a position of said reference object with respect to a reference coordinate system based on temporal information;a spacecraft control processor that receives said attitude-related position information, along with said reference position information, and generates a measurement error estimate of said measurement error present in said attitude-related position information, and said spacecraft control processor using said measurement error estimates to null said measurement error present in said attitude-related position information;a bias correction block that receives said attitude-related position information from said attitude sensor and said measurement error estimate, and generates a difference signal representative of said difference between said attitude-related position information and said measurement error estimate;a measurement processing block that receives said reference position information and said difference signal and generates a spacecraft attitude estimate and measurement residuals; anda bias estimation block that receives said difference signal and said measurement residuals and generates said measurement error estimate that is used by said bias correction block.