Digital Tdi Star Camera Calibration Based On Real Space

At present, the accuracy of star sensor calibration based on real space is limited by the factors of vibration, atmospheric environment and so on. In this paper, a new calibration method for digital Time Delay Integrate (TDI) star camera is proposed based on two star cameras joint observation, overcoming the disadvantage mentioned above with high accuracy. Firstly, a mathematic modeling process is introduced with the proposed method. Then an experimental system is set up with two star cameras and an equatorial. Finally, static and dynamic measuring is complemented and errors are analyzed. The results show that, with the proposed method the calibration accuracies of star camera round X/Y axes are 1.45 '' (3 sigma)/0.84 '' (3 sigma), respectively.