Preliminary Evaluation of on Orbit Measurement Accuracy of CM-1 Star Sensors
Star sensor is currently the mainstream high-precision attitude measurement instruments,during orbit operation,it will generate system error,high-frequency error,and low-frequency error.This paper calculates the system error and high-frequency error of the terrestrial ecosystem carbon monitoring satellite(CM-1)star sensors,analyzes the rule of the optical axis angle error of the star sensor 1a and 1b and the latitude of the satellite,and models the optical axis angle low-frequency error based on the Fourier series transform,and in this way reflects the low-frequency error of the two star sensors.The on-orbit data show that the system error for rotating star sensor 1a to star sensor 1b and star sensor 1a to 2 is(6.906',-12.569',-1.552')and(-4.540',-27.199',13.522'),respective1y;the highest accuracy among the data of star sensor is the fusion of star sensor 1a/1b data,the error of three axis is 0.505"0.633"and 0.800".The precision of the same group of star sensor 1a and 1b is similar,the error of three axis of star sensor 1a is 0.990",0.981"and 16.731",and the error of three axis of star sensor 2a is 0.888",1.022"and 15.156".The precision of star sensor 2 is slightly worse,with the error of three axis of 2.061",2.382"and 27.231".The optical axis angle error(3σ)of star sensor 1a and 1b is 2.50",and the low-frequency and high-frequency error of the axis angle between the optical axis is 2.046"and 1.470",respectively.The optical axis angle error is basically the same in the neighboring orbital with the same latitude of the satellite.
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