大型低轨星座自适应绝对站位保持法

ADAPTIVE ABSOLUTE STATION-KEEPING METHOD FOR LEO MEGA-CONSTELLATION

针对大型低轨星座的长期维持控制,提出了一种自适应绝对站位保持法。利用卫星受大气阻力影响引起平半长轴衰减进而使得相位产生漂移的原理,推导了半长轴维持控制量计算公式,给出了星上自主计算维持控制量的流程。利用该算法分析了不同面质比卫星在太阳活动低年和高年的维持控制规律,结果表明使用该算法能够有效使卫星相位保持在维持区间。使用两行轨道根数分析了星链卫星的维持控制规律,采用该算法对其维持情况做出了改进,有效降低了维持控制次数。

The adaptive absolute station-keeping method for low earth orbit(LEO) mega-constellation was proposed to realize station-keeping over a long period of time. The mean semimajor axis of satellite’s orbit decreases under the influence of air drag, which leads to the phase deviation of satellite. This principle was used to derive equations of station-keeping control value. Then the autonomous computation procedure of control value on satellite was determined. The method was used to analyze the station-keeping characteristic of satellites with different area-mass ratio in both low and high solar activity. Results showed that phase deviation of satellites was effectively maintained within the control threshold. The two-line element(TLE) was used to analyze the station-keeping characteristic of StarLink satellites. The absolute station-keeping method was applied to improve the station-keeping condition of StarLink satellites, and it turned out to effectively reduce the station-keeping frequency.