针对纬轴工作范围为±20°的三轴跟踪架结构不能跟踪半球空域内所有卫星的问题,本文研究了卫星跟踪原理,结合纬轴受限的三轴结构特点,推导出了三轴之间关系的公式,并由此仿真得出了STTA卫星跟踪策略算法.跟踪仰角70°以上的卫星时,采用方位轴定位式水平式跟踪,这种跟踪方式既利用了水平式结构保精度跟踪天顶附近目标的优势,又克服了地平式结构有天顶跟踪盲区问题;跟踪仰角70°以下的卫星时,采用方位轴随动式水平式跟踪,这种跟踪方式使地平式跟踪方式和水平式跟踪方式有机地结合起来,实现优势互补,达到了更为理想的跟踪效果.该跟踪策略不仅解决了三轴转台纬轴工作范围受限问题,而且能够捕获跟踪半球空域内所有卫星,并保证卫星全程在保精度跟踪范围内.最后设计了实验,证明了该跟踪策略算法的有效性和可行性.

The three-axis tracking structure of vehicular opto-electronic equipment with a latitude axis range of ±20° can not track all secondary planets in the half-airspace.So,this paper explores the principle of satellitic tracking,derives the relationship formulas between three axes and gives a tracking tactic arithmetic for the STTA satellite by a simulation.When a secondary planet with a tracking elevation above 70° is tracked,the azimuth-position horizon tracking mode is adopted.It not only uses the superiority of the horizon gimbal mode with a lower tracking error,but also conquers the altazimuth gimbal with tracking dead zone.When a secondary planet with a tracking elevation bellow 70°is tracked,the azimuth gimbal and following up mode is adopted.It combines the superiority of the horizon gimbal and altazimuth gimbal and receives the better effect.This arithmetic not only has solved three-axis turntable vehicular space but also has ensured the secondary planet in an assuring range and can capture all secondary planets in the half-airspace.The experimentation is designed,which verifies that the tracking tactic arithmetic is effective and feasible.