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.