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多视场星敏感器与传统单视场星敏感器相比不仅具有更高的可靠性和自主性,也具有更高的精度和动态性能,是未来星敏感器发展的重要趋势之一。为获得最佳性能,需要对多视场星敏感器的视场大小和布局进行优化。为此,首先建立了多视场星敏感器的数学模型,重点介绍了星点成像和姿态计算。然后推导了多视场星敏感器测量精度的数学表示,分析了影响精度的因素。通过仿真分析了多视场星敏感器视场大小和布局对各因素和精度的影响。仿真结果表明,视场大小对星敏感器精度的影响取决于星敏感器的运动情况,当角速度较小时,视场越小,精度越高;当角速度较大时,视场越大,精度越高。而各视轴相互正交的视场布局下,多视场星敏感器的测量精度最高。
Multi-field star sensor compared with the traditional single-field star sensor not only has higher reliability and autonomy, but also has higher accuracy and dynamic performance, is one of the important trends in the future star sensor development. For optimal performance, the field size and layout of the multi-field star sensor needs to be optimized. To this end, the mathematical model of multi-field-of-view star sensor is established first, and the star point imaging and attitude calculation are mainly introduced. Then the mathematical representation of multi-field star sensor measurement accuracy is derived, and the factors affecting the accuracy are analyzed. The influence of field size and layout of multi-field star sensor on each factor and precision is analyzed by simulation. The simulation results show that the influence of the field of view on the precision of the star sensor depends on the movement of the star sensor. When the angular velocity is small, the smaller the field of view is, the higher the accuracy is. When the angular velocity is larger, the larger the field of view, high. The visual field of each binocular orthogonal layout, the multi-field star sensor has the highest measurement accuracy.