GEO 卫星基于电推进系统的倾角与偏心率联合控制方法

摘要

Nowadays most advanced GEO satellites collocate electric thrusters with high specific impulse to execute north-south stationkeeping, which can efficiently decrease propellant consumption. For GEO satellites, electric thrusters usually controls nothing but inclination,whi le bipropellant thruster controls eccentricity and mean longitude.Aiming at the stationkeeping of GEO satellite with electric thruster,a sort of combination control method of inclination and eccentricity using electric thrusters was proposed.The optimization model for solving the control equations was developed. Two kinds of simplified algorithm were induced by reducing the optimization model dimensionality, which deeply decrease the computational complexity and was convenient for autonomous computation of GEO satellite stationkeeping.This method can be used to simulate the combined inclination and eccentricity simultaneously and precisely, which leads to the reduction of propellant consumption for stationkeeping.The simulation results indicate that the combination control method has the advantages of high stationkeeping efficiency and high control precision.%针对配置电推力器的 GEO 卫星位置保持问题,提出一种对倾角与偏心率进行联合控制的方法,建立了求解控制方程的优化模型,并针对优化模型变量多、约束复杂的问题进行降维处理,得到两种简化的求解方法,降低了求解复杂度与计算量,适合星上自主计算。采用联合控制方法,仅靠电推力器就能够同时实现卫星倾角和偏心率的高精度控制,有效降低卫星位置保持总的推进剂消耗。仿真算例表明,与电推力器只控倾角的传统方法相比,在保证偏心率控制精度不变的前提下,采用电推力器倾角与偏心率联合控制方法,15年寿命期内节省推进剂质量39 kg。