敏捷卫星对目标访问信息的计算方法

Calculation Method for Access Information of Agile Satellite on Target

任务分解是任务规划的前提,其核心是计算卫星对目标的访问信息,即计算卫星访问目标时的姿态角、实际地面分辨率和太阳高度角。首先计算目标点在地心空间直角坐标系中的坐标,经过多次坐标转换,得到目标点在卫星轨道坐标系中的坐标,从而可以计算出相应时刻卫星对该目标的二维指向角度。在此基础上,根据卫星成像原理,分别计算光学卫星和雷达卫星的实际地面分辨率。最后,通过计算太阳赤纬和太阳时角,得到太阳高度角。

Task decomposition is a prerequisite for mission planning, and it is essential to calculate the access information of satellite on target, namely, calculate the attitude angle, the actual ground resolution as well as the solar elevation angle. Target coordinates in space geocentric Cartesian coordinate system are first calculated, and the coordinates of the target point in the coordinate system of the satellite orbit are obtained after several coordinate conversions ,which can be used to calculate the angle of the two-dimen- sional pointing angle of satellite on target at the corresponding time.On this basis,according to satellite imaging principle, it is easy to calculate the actual ground resolution of optical satellites or radar satellites. Finally, by calculating the solar declination and the solar hour angle, the solar elevation angle can be obtained.