【摘要】 在捷联惯导系统中,星敏感器直接固定在弹体上,在动态环境下工作。本文根据光学成像原理、快门速度和图像传感器上星点移动速度等,建立了动态条件下星敏感器所获星点光斑的数学模型。通过计算机仿真得出了曝光时间与动态星点像元能量最大值的关系、不同曝光时间下的动态星点定位精度。仿真结果表明,动态星点像元能量最大值不能随着曝光时间的延长始终增大,动态星点形变对星点定位精度的影响可以忽略。更多还原

【Abstract】 Star sensor is directly fixed on the missile in strap-down inertial navigation system.It works in a dynamic state because of the movement of missile.According to the theory of optical imaging,the speed of shutter and the velocity of star spot on image sensor,etc,dynamic star spot mathematical model is founded.Relationship between the maximum pixel energy of star spot and integration time is discussed by computer simulation.The position locating accuracy of dynamic star spot which is obtained in different time of exposure is also analyzed.The simulation results show that the maximum pixel energy of dynamic star spot can not increase continuously by extending time of exposure and the effect of the deformation of dynamic star spot on the accuracy of centroid location can be neglected.更多还原