High precision star point displacement estimation

In order to achieve high-precision positioning measurement of InSAR satellite, we proposed to use InSAR satellites to capture multiple star point images and obtain high-precision centroid displacement and angular distance of star point to achieve high-precision baseline measurement, so as to improve positioning measurement accuracy. By studying the effect of image detector pixel position deviation on the accuracy of the centroid displacement measurement of the star point, we proposed a pixel position deviation calibration method based on heterodyne laser interference. Due to the inhomogeneity of the pixel-to-pixel response, we constructed an image sensor simulation model with pixel deviations. Image sensor pixel calibration results showed that with the mean value of 0 and the standard deviation of 0.01, the image sensor pixel calibration accuracy was better than $7 \times 10^{{-5}}$ pixel. The research results were of great significance for improving the measurement accuracy of the centroid displacement of star point and improving the high-precision positioning measurement of InSAR satellites.