The Research On The Detecting Method Of Star Sensor Imaging Plane Attitude

The star sensor is a kind of high-precision attitude measuring equipment based on the star,which is of great significance to the attitude measurement of spacecraft.And the assembly accuracy of the star sensor,to a large degree,determines its measurement accuracy.In order to meet the requirements of high precision measurement of star sensors,putting forward feasible assembly methods and assembly precision detection methods become urgent problems to be resolved.As the imaging device of star sensor,the assembly accuracy CCD or CMOS image sensor directly affects its assembly precision,which is of great importance to guarantee the measurement precision of star sensor.According to the requirements of the attitude detection of detector imaging plane,the attitude detection method of detector imaging plane is proposed and the corresponding detecting device is designed.The inclination angle detection of the detector imaging plane with respect to the reference flange plane and the rotation angle detection with respect to the external reference cubic mirror are realized.The error analysis of the measuring device and the error model are carried out,and the transfer coefficient and the synthesis method between the measurement error and the geometric error of the detecting device are obtained.The shortcomings of the existing error detection methods are analyzed,and a fast measurement method of errors is proposed and verified.The efficiency of error detection is improved and the purpose of error compensation is achieved.With Visual Studio software as the development platform,the corresponding software control system is designed,including single axis motion control,real-time display of position,data acquisition and storage,status monitoring,command feedback information bar and data processing algorithm,and human-computer interaction is achieved.This dissertation presents many calibration experiments for the measurement equipment of the device,and it is verified that the optimum measurement range of the laser displacement sensor is near its reference distance.The zero-point repeatability test of horizontal X and Y-direction guide rails is designed,and the fast error detection and compensation verification as well as angle precision verification experiments are designed.The zero point positioning accuracy of the two axes is within 2?m,which can meet the measurement requirements.Compared the measurement results of a standard plane with the high accuracy laser interferometer,the X axis measurement error is within 1.5?m and the Y axis measurement error is within 2.9?m.Rotation angle error is less than 0.0189 degrees,which meets the requirements of measurement.