顾及系统误差的GEO卫星几何法定轨PDOP值分析

Study on PDOP of Geometry Orbit Determination for GEO Satellite with Systematic Errors

针对GEO卫星几何法定轨中系统误差对PDOP值的影响进行研究,首先回顾了经典几何法定轨的基本原理,然后根据顾及系统误差的几何法定轨原理推导出PDOP值计算公式,并利用5个跟踪站的模拟数据,计算了多种系统误差情况下PDOP值。结果表明:系统误差对GEO卫星几何法定轨的PDOP值影响很大;采用顾及系统误差的几何法定轨方法可以较好地削弱系统误差对PDOP值的影响;国外布设跟踪站比仅在中国布设跟踪站能更好地削弱系统误差对PDOP值的影响。

Effect of systematic error on Position Dilution of Precision（PDOP） of geometry orbit determination for Geostationary Earth Orbit（GEO） satellite was discussed.Firstly,the fundamental principle of classical geometry orbit determination was reviewed;secondly,the formula calculating PDOP was deduced by the method of geometry orbit determination with systematic error;thirdly,PDOP with multi systematic errors was computed by simulated data from five tracking stations.The result showed that the influence of systematic errors on PDOP of geometry orbit determination for GEO satellite was significant;the influence could be efficiently weakened with the method of geometry orbit determination with systematic error;compared with the tracking stations selected only in China,overseas tracking stations selected could weaken the influence of systematic errors on PDOP more efficiently.