초록 ▼

An attitude determination system for an artificial satellite capable of performing star identification without need for the aid of ground station includes an image processing module (17) for processing star images observed at predetermined time points by a star sensor (16) mounted on the artificial

An attitude determination system for an artificial satellite capable of performing star identification without need for the aid of ground station includes an image processing module (17) for processing star images observed at predetermined time points by a star sensor (16) mounted on the artificial satellite (1) for arithmetically determining direction vectors of the observed stars, a rotation estimating module (18) for estimating a rotational motion of the artificial satellite (1) between an attitude of the artificial satellite at a predetermined time point and an attitude of the artificial satellite at another time point, an elongation estimating module (19) for estimating elongations between the direction vectors of plural stars the images of which are picked up at a same time point by the star sensor and estimating the elongations between the direction vectors of plural stars the images of which are picked up at different time points by the star sensor on the basis of the estimated rotational motion, a star identifying module (20) for establishing correspondences between a plurality of the stars for which relation of the elongation has been determined and stars on a star catalog for identifying the stars, and an attitude angle estimating module (21) for estimating an attitude angle of the artificial satellite on the basis of result of identification of the stars.

대표청구항 ▼

[ What is claimed is:] [1.] An attitude determination system for an artificial satellite, comprising:an image processor for processing star images which are observation values of stars sensed at predetermined time points by a star sensor mounted on said artificial satellite to arithmetically determi

[ What is claimed is:] [1.] An attitude determination system for an artificial satellite, comprising:an image processor for processing star images which are observation values of stars sensed at predetermined time points by a star sensor mounted on said artificial satellite to arithmetically determine direction vectors of said observed stars;a rotation estimator for estimating a rotational motion between an attitude of said artificial satellite at a predetermined time point and an attitude of said artificial satellite at another time point;an elongation estimator, having an output of said rotation estimator and an output of said image processor as its inputs, which estimates elongations between the direction vectors of said observed stars on the basis of said estimated rotational motion;a star identifier for establishing correspondences between a plurality of the stars for which relation of said elongations has been determined and stars on a star catalog; andan attitude angle estimator for estimating an attitude angle of said artificial satellite on the basis of result of the identification of the stars,wherein said rotation estimator uses the star images on a plurality of image screens respectively photographed at different image pick-up time points by said star sensor.