多曝光星敏感器的全运动参数建模及优化设计

多曝光成像方法是一种有效提升星敏感器姿态更新率的技术，但该方法随着运动角速度及角加速度增大，相邻星点轨迹的交叉概率显著增大，严重影响其提升性能。为了解决上述问题，建立了基于星敏感器全运动参数的星点成像位置模型，并据此确定了星点在工作周期内的运动位移。根据该模型，对交叉概率与全运动参数、焦距、星点位置等的关系进行了仿真，并确定了全运动参数的极限安全值为角速度ω≤26.4（°）/s，角加速度α≤5（°）/s2。外场观星实验充分验证了所提方法的有效性。 

Complete motion parameters modeling and optimization design of multiexposure star tracker

The multiexposure imaging method can be utilized to improve the attitude update rate of the star tracker effectively. However, with the increase of the angular velocity and angular acceleration, the cross probability of adjacent star tracks increases significantly, thus seriously affecting the performance of multiexposure imaging method. In order to solve the above problem, first, the star imaging position model based on the complete motion parameters of star tracker is established, and the movement displacement of the star point in the working period is determined accordingly. Then, according to the above model, the relationship between the cross probability and the parameters such as complete motion parameters, focal length and star position, is simulated quantitatively, and the limit safety values of complete motion parameters are determined as angular velocity ω ≤ 26.4(°)/s and angular acceleration α ≤ 5(°)/s2. Finally, a star observation field experiment is carried out to further verify the effectiveness of the proposed method.