偏距对改进X-Y双轴式光电跟踪系统跟踪性能的影响

Effect of deflection distance on tracking capability of photoelectric tracking system with ameliorated X-Y double-axis gimbal

天顶跟踪盲区是地平式光电跟踪系统的固有缺陷。X-Y双轴式光电跟踪系统(规则X-Y双轴式)可以解决过顶跟踪问题,但跟踪范围极为有限,把视轴沿X轴方向平移偏距D,形成一种改进的X-Y双轴式光电跟踪系统,即偏X-Y双轴式光电跟踪系统。偏X-Y双轴式光电跟踪系统可以解决过顶跟踪问题,其跟踪范围与规则X-Y双轴式光电跟踪系统相比有很大提高。由D引入的跟踪误差可以忽略或修正,但具有更大的地平面跟踪盲区。

Photoelectric tracking system with horizontal gimbal can not track objects near zenith. However, photoelectric tracking system with regular X-Y double-axis gimbal can track the object at the zenith, but it has small tracking region. X-Y double-axis gimbal by X axis transferring D could track objects near zenith, has wider tracking region than regular X-Y double-axis gimbal. Tracking errors because of D could be ignored or corrected, but has bigger blind region on the horizon than regular X-Y double-axis gimbal.