Multiple star image and attitude associated star sensor internal parameter calibration method and device thereof

Abstract

The invention discloses a multiple star image and attitude associated star sensor internal parameter calibration method and a device thereof. A GPS antenna 3, a gyroscope unit 1 and a to-be-calibrated star sensor 2 communicate with a GPS receiver 4 respectively, and a data processing computer 5 is connected with the gyroscope unit 1 and the to-be-calibrated star sensor 2 respectively; synchronous data acquisition of the gyroscope unit 1 and the star sensor 2 is realized by virtue of UTC (universal time coordinated) time information acquired by the GPS receiver 5, and calibration algorithm solution of the to-be-calibrated star sensor 2 is completed in the data processing computer 5. According to the method, the gyroscope unit is used for providing accurate rotating angle information to implement splicing association of a plurality of frames of star images, thereby increasing observed data samples for internal parameter calibration of the star sensor; the method can be used for calibration under a dynamic condition, no strict requirements are made to the motion state of the to-be-calibrated star sensor 2, the calibration accuracy and reliability are improved, a calibration flow is simplified, dynamic calibration of the to-be-calibrated star sensor 2 can be conveniently implemented, and the method and the device are also applied to calibration of an inertial / celestial combined navigation system.

Description

technical field [0001] The invention relates to a method for calibrating internal parameters of a star sensor and a device thereof in the field of aerospace measurement; in particular, it relates to a method for calibrating an internal parameter of a star sensor with an attitude-related frame and a special device thereof. Background technique [0002] The star sensor is one of the core sensors of the attitude control of the spacecraft. It realizes the measurement of the attitude of the spacecraft through the incident angle information of the sensitive starlight. The precise calibration of parameters such as the focal length of the optical lens, the principal point, and the distortion (collectively referred to as internal parameters) is the premise and key to the high-precision attitude measurement of the star sensor. Therefore, the star sensor must be strictly calibrated on the ground before it is put into use. . [0003] my country's national military standard "Star Sensor...

AI Technical Summary

Problems solved by technology

However, this method does not fully consider the real statistical characteristics of the star angular distance error, and simply treats it as white noise, so the algorithm is not the optimal estimate in theory, and the calibration accuracy is poor

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