基于地球扁率红外地平仪测量值修正算法研究

The correction algorithms of measurement of the scanning horizon sensor based on earth oblateness

根据对地球扁率引起红外地平仪测量值误差修正算法进行了研究 ,椭球地球模型矢量投影关系得到了地球扁率修正函数和姿态角计算公式。由于地平穿越点由地球表面方程、地平平面方程和扫描圆锥锥面方程唯一确定 ,采用了递推方法解算出地平穿越点处的几何量 ,所得结果通过扁率修正函数对姿态角进行实时修正。所提算法简单 ,易于星载计算机在线实现 。

The correction algorithms of the measurement of the scanning horizon sensor for the earth oblateness is studied.The correction function of the earth oblatenss and attitude angles are obtained by the projected vector relationships.The geometry quantities of the horizon crossing points are gotten by iteration algorithms.Because of the fact that the horizon crossing points is only determined by the earth surface equation,earth horizon plane and cone surface equation of the scanning cone are definate.The results from above are used to correct the attitude angle by the correction function of the earth oblatenss in realtime.The method is simple and easily realized in the on board computer.The simulation results show its validity.