A Multi-FOV and Low Remanence Star Sensor and Its Application in Geomagnetic Measurement Satellite

The next generation space mission of geomagnetic navigation puts forward urgent demands on the geomagnetic measurement satellite,and the high precision satellite requires extremely high attitude measurement accuracy and space environment with residual magnetic,which puts forward new requirements on the star sensors.Aiming at the requirements,the improved design method with low remanence and high precision star sensor is studied in this paper,which adopts the three fields-of-view design and the separated body of structure to improve attitude measurement precision.Meanwhile,it improves the attitude determination accuracy by increasing the data updating rate and data fusion,and designs the optical head of the star sensor to reduce remanence.Finally,the simulation and test results show that the improved design method of star sensor can achieve the performances of low remanence and high attitude determination accuracy,which satisfies the demand of geomagnetic measurement satellites and has high application value.

This article proposes an improved design method for star sensors with low remanence and high accuracy. By designing a multi field structure, the measurement error in the optical axis direction was reduced, and then a split optimization design was carried out. The optical head has been finely designed to reduce residual magnetism, and the residual magnetism indicators of the optical head and electronic box have been strictly controlled. At the same time, high-precision attitude determination algorithms have been used to improve the accuracy of attitude determination. The method proposed in this article can improve attitude measurement accuracy and reduce the impact of residual magnetism on geomagnetic field detection, which has great significance for the application of geomagnetic field measurement satellites.