A Fast Star Angle/Time Delay Measurement Integrated Navigation Method

Abstract

The time delay based on solar oscillation is a new type of celestial navigation measurement. Combined with the star angle measurement, it can improve the navigation performance. However, the ephemeris error of Phobos will reduce the navigation accuracy. To solve this problem, a fast star angle/time delay measurement integrated navigation method is proposed. The position and velocity of Phobos are estimated online to suppress the effect of Phobos ephemeris error on the estimation accuracy of star angle/time delay measurement integrated navigation. The amplitude of the innovation is tested by setting a threshold，and the implicit unscented Kalman filter based on time delay measurement is selectively performed，which greatly improves the real-time performance of navigation. Simulation results show that the proposed method can significantly improve the real-time performance of navigation while ensuring navigation accuracy.

Keywords

deep space exploration / celestial navigation / integrated navigation / Solar oscillation；time delay measurement / ephemeris error

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