地平式跟踪系统过顶问题研究

地平式光电系统过顶跟踪时需要很大的方位角速度，在目标通过天顶瞬间方位角速度达到无穷大，导致地平式系统在天顶附近存在跟踪盲区。为此，对天顶跟踪盲区进行了分析，提出盲区范围计算公式，并分析了天顶附近目标图像旋转问题。从软硬件两种角度提出过天顶跟踪目标的方法，即倾斜方位轴方法和程序引导方法，通过比较二者的优缺点给出具体应用范围。

Solution to Overcome Zenith Blind Zone in Altitude-Azimuth Optoelectronic System

Tracking around the zenith requires a very rapid motion in azimuth, approaching infinity in the limit of a star passing exactly through the zenith. The result is a blind zone around the zenith for altitude-azimuth mounts. The zenith blind zone is mainly considered and some formulae are given for estimation of the dimensions of it. The effect of field rotation, which is another disadvantage for altitude-azimuth optoelectronic tracking system, is analyzed briefly. Two solutions to overcome the zenith blind zone are presented, which also leads to some directions for future investigation.