基于高精度对流层延迟改正的转发式卫星测定轨

Orbit determination by transfer tracking based on high-precise tropospheric delay correction

转发式卫星测定轨传统上一直使用气象站数据和Saastamonien模型,计算天顶对流层延迟,精度约为4 cm。为了提高对流层延迟改正精度,并进一步提高卫星测定轨精度,在转发式测轨站上并址配置测地型GPS/BDS多系统接收机,基于IGS/iGMAS产品计算得到各站高精度的对流层天顶延迟,精度约为5 mm。将此新的对流层延迟改正应用于定轨软件,开展了GEO卫星转发式测定轨试验。试验结果表明:使用本文方法的对流层延迟后,定轨精度有较为明显提高,平均重叠弧段轨道差由1.402 m,减小到1.268 m,改善约为10%。

Meteorological data and Saastamonien model are traditionally used to calculate the zenith tropospheric delay with the accuracy at 4 cm level in the technology of orbit determination by transfer tracking(ODTT).To improve the precision of the tropospheric delay correction and the precision of satellite orbit determination,the geodetic GPS/BDS multi-system receivers are equipped at the stations of the transfer ranging system.Based on the products of IGS/iGMAS,a 5 mm level high-precise zenith tropospheric delay can be obtained in every station.After applying the new tropospheric delay correction to the software of satellite orbit determination,the GEO satellite orbit determination experiments are carried out.It was shown that the accuracy of orbit determination is obviously improved by using the new tropospheric delay.The average of the orbit difference in the overlap of adjacent orbits almost decreases by 10%from 1.402 m to 1.268 m.