Abstract: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 sensor. 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.