Research On The Star Sensor Calibration Method Based On Attitude Correlated Frame

In recent years,with the rapid development of space technology such as high-resolution satellite navigation and deep space exploration,there is an increasing demand of attitude measurement of satellites,spacecraft,aerospace survey ship,large surface combat ships and so on,which have greatly promoted the development of star sensor technology,but also put forward higher requirements for the attitude measurement accuracy of star sensor.The accurate calibration of the intrinsic parameters is the prerequisite and the key to achieve high-precision attitude measurement of the star sensor.Therefore,how to accurately calibrate the intrinsic parameters has now become a hot issue in the field of star sensor research.This paper focuses on the calibration method of star sensor intrinsic parameters.The main contents are given as follows:1.The basic theory of the existing star sensor calibration method is studied.The basic principles and mathematical models of two existing star sensor calibration methods are summarized.The effects of error factors such as the star point distribution and the star noise on the accuracy of existing star sensor calibration method are studied,and the calibration accuracy of dependent attitude calibration methods and independent attitude calibration methods were compared.The simulation results show that the calibration accuracy of the intrinsic parameters of star sensor is higher when the distribution of star points is more uniform and the number of star points increases.And under the same situation,the calibration accuracy of dependent attitude calibration methods is better than the independent attitude calibration methods.2.Aiming at the deficiency of the existing star sensor calibration method,a star sensor calibration method based on the attitude-correlated frames approach(ACF)is proposed.On the one hand,the basic mathematics model of the calibration method is deduced theoretically in detail and the effects of error factors such as Gyro bias,angular random walk and star noise on the accuracy of the calibration method are analyzed in detail through simulation.On the other hand,The accuracy of the star sensor calibration method under three kinds of gyro parameters of low precision,medium accuracy,high precision and so on has been studied.3.In order to test the actual performance of the star sensor calibration method based on the ACF method,simulation and experimental verification are carried out respectively.Results show that the star sensor calibration method based on the ACF method can achieve a higher calibration accuracy of the intrinsic parameters,and in the same situation,the proposed calibration method is more precise and robust than the calibration method based on the invariant of interstar angles,and the installation matrix between the star sensor and the gyro unit can be calibrated out simultaneously,which is suitable for the calibration of the inertial/celestial integrated navigation systems.