IGR轨道外推及其在对流层实时监测中的应用研究

Application of IGR Extrapolated Orbit in Real-Time Tropospheric Monitoring

在精密定轨和轨道外推理论的基础上,对比分析了由IGS快速轨道(IGS rapid orbit,IGR)外推1 d的轨道与IGS最终轨道间的差异,用此外推轨道和最终轨道分别按长基线双差网解方案计算了BRUSI、ENG、PTBB等欧洲一些IGS/TAI站的天顶湿延迟(zenith wet delay,ZWD),并对两种轨道下各站的ZWD进行了对比。轨道对比结果显示,除异常卫星外,“病态”卫星的IGR外推1 d的轨道仍具有一定的高精度。而ZWD的对比结果则表明,当剔除异常卫星的影响并对“病态”卫星加以适当处理后,IGR外推1 d的轨道用于对流层实时监测是可行的。

Based on the theory of precise orbit determination and orbit extrapolation, the differences between IGS rapid orbit （IGR）extrapolated one day orbits and IGS final orbits is analyzed. And using these two kinds of orbits, the ZWDs of some European IGS/TAI stations, such as BRUS, IENG, PTBB, NPLD,WAB2 etc. are estimated and compared. The difference of the orbits shows that except the problem satellites （such as manoeuvre, modelling, bad phase or/and bad code data satellies）, all the other satellites, including healthy satellites and ill satellites, have IGR extrapolated one day orbits with an accuracy better than 0.5 m in radial-axis. The comparison of the ZWDs shows that excluding the problem and ill satellites＇, using the IGR extrapolated one day orbits, a negligible bias and an RMS less than 5 mm can be obtained wrt IGS final orbits. The IGR extrapolated one day orbits has the potential in real-time tropospheric monitoring applications.