一种天基测控中可见性分析的计算方法

Calculation Method of the Visibility Analysis Based on Tranking and Data Relay Satellite System

传统的地基测控中,一般以仰角来界定航区测控的可见性;但在天基测控中,上述方法的使用存在一定的难度。基于型号的实际应用,得到一种新的计算方法,用于天基测控中的可见性分析,并通过仿真手段对该方法进行了验证和分析。天基测控中的可见性包括:几何可见性和选星算法。几何可见性分析主要考虑两个限制因素:中国中继卫星由于采用机械运转的天线,覆盖范围有限,大于该锥面的区域为不可见区域;地球对信号的遮挡。选星算法中开创性提出了"先到先得"原则,使得切星次数最少,且有规律可寻。在飞行试验中,该计算方法成功实施切星和波束指向,圆满完成飞行试验中的测控任务。

Based on the practical application, the article invent a method to calculate the tracking area of the TTC based on TDRSS. And through the simulation, the method has carried on the validation and analysis. The tracking area of the TTC based on TDRSS includes geometric visibility and selective star algorithm. Geometric visibility analysis considering two main limiting factors： first, TDRSS in my country due to the antenna limited coverage, because of adopts mechanical motion, greater than the cone area is not visible area; second, the earth is blocking the signal. In the star-selection algorithm, the principle of ＂first come first served＂ is proposed, which makes the number of the switch stars is the least and the rule can be found. In flight test, this method successfully implemented the switch stars and beam pointing, and successfully completed the measurement and control tasks.