视轴偏角对三轴光电跟踪系统跟踪过程的影响

地平式、X-Y式光电跟踪系统存在空间跟踪盲区。三轴光电跟踪系统通过跟踪方式切换可以解决空间跟踪盲区问题,但视轴偏角使得脱靶量到轴转动量的转换不同于常规地平式跟踪系统,同时使系统具有不可见区域。分析和仿真表明:视轴偏角较小时,脱靶量与轴驱动量的转换可用常规地平式跟踪系统中的方法近似,否则,需用不同的计算方法;在三轴跟踪系统退化成的地平式跟踪系统的天顶跟踪盲区外即可进行跟踪方式切换。

Effect of declination angle of sight axis on three-axis photoelectric tracking system

A horizontal or an X-Y gimbal photoelectric tracking system has spatial blind region while a photoelectric tracking system with three-axis gimbal can solve the problem of blind region by means of mutual conversion of tracking mode. Such conversion may introduce declination angle to the sight axis. Conversion of miss distance to running angle of axis differs from routine photoelectric tracking system with horizontal gimbal and the system has unreachable spatial regions. Both analysis and simulation results show that when the declination angle of sight axis is little, conversion of miss distance to running angle of axis is same with routine tracking system with horizontal gimbal, otherwise different formula should be adopted. During tracking, conversion of tracking mode is performed outside the spatial blind region of the tracking system with horizontal gimbal, where the spatial blind region is predigested from tracking system with three-axis gimbal.