GEO带目标编目库的星历设计

Ephemeris design of space cataloging library with targets on GEO ring

针对目前空间目标编目库普遍采用的2行根数——简化常规摄动4/简化深空摄动4(TLE-SGP4/SDP4)模型复杂,源码不公开,且轨道精度不高的问题,提出一种地球同步轨道(GEO)带目标编目库的星历设计方法:基于数值积分的多天精密预报轨道,针对GEO的静地特性,设计19/25/31个参数的无奇点根数型星历模型;并采取定时长和多组星历同步更新策略,适用于数小时至数天的日常预报轨道发布及更新。实验结果表明,3种无奇点根数型星历模型可灵活适应合作/非合作GEO目标的预报轨道精度和预报时长,1 d拟合均方根(RMS)均值分别优于30、10和7 m;当缩短拟合时长至12 h,31参数星历模型的拟合精度可优于0.2 m。

Aiming at the problem that the two-line element-simplified general perturbations-4/simplified deep-space perturbations-4(TLE-SGP4/SDP4)model commonly used in the current space target catalog is complex,with unavailable source codes in public and low orbit accuracy,the paper proposed the ephemeris design method of space cataloging library with targets on geosynchronous Earth orbit(GEO)ring:based on the multi-day precise forcast orbits of numerical integration,the 19/25/31 covariance element-ephemeris models without singularities were designed for the static characteristics of GEO;and the synchronized update strategy with fixed duration and multi-group ephemeris was adopted,suitable for daily forecast orbit release and update from hours to days.Experimental result showed that the three element-type ephemeris models could flexibly adapt to the forecast orbit accuracy and forecast duration of cooperative/non-cooperative GEO targets,and the mean values of 1 d fitted root mean square(RMS)would be better than 30,10 and 7 m,respectively;when the fitting duration is shortened to 12 h,the fitting accuracy of the 31-parameter ephemeris model could be better than 0.2 m.