卫星太阳光压力矩计算中有效作用面积的计算

为了精确计算卫星在轨运行时所受的太阳光压力矩,给出了1种考虑太阳帆板与卫星体相互遮挡时太阳光压力矩的求取方法.将卫星体和太阳帆板组成的几何体进行投影变换后,判断其相互遮挡并采用凸多边形求交的算法求取太阳光压有效作用面积,从而计算太阳光压力矩.以某太阳同步轨道卫星为例进行计算,结果表明:当卫星体和太阳帆板的面积相比较小时,太阳光压力矩的求取可忽略卫星体以及卫星体对太阳帆板遮挡的影响.该方法同样可推广到考虑太阳帆板与卫星相互遮挡时气动力矩的求取.

Method to Calculate Effective Area Used in Computation of Solar Radiation Torque of Satellite

This paper gives an efficient method to get accurate solar radiation torque when the satellite is on orbit. The method considers the impact of the mutual hiding of the satellite body and solar panel. The geometrical object composed with satellite body and solar panel is transformed by projection. The hiding is determined. The effective area of solar radiation is calculated with the theory of computing the intersection set of convex polygons and the solar radiation torque is accounted. Simulation analysis of the solar radiation torque of a solar synchronous orbit satellite is performed and the simulation results show that the effect of the mutual hiding can be omitted if the surface area of the satellite body is much smaller than that of the solar panel. This method can be generalized to the computation of the aerodynamic torque when the mutual hiding of the satellite body and solar panel is considered.