基于BDS与GPS精密单点定位的天顶对流层延迟估计比较

Comparison of the Zenith Tropospheric Delay Estimated by Precise Point Positioning Using BDS and GPS Data Respectively

在BDS与GPS现有星座条件下,针对若干IGS和MGEX跟踪站的实测数据,利用CODE事后GPS产品与WHIGG计算的BDS精密轨道和钟差,对GPS单系统、BDS单系统及两者组合系统进行精密单点定位(PPP)处理,估计出相应的天顶对流层总延迟量,并进行分析比较。实验表明,与IGS提供的对流层产品相比,利用GPS单系统处理,能较准确地反映出天顶对流层延迟量,其精度为mm级;BDS单系统结果较GPS单系统略差,其精度优于2cm;GPS与BDS组合系统的结果与GPS单系统结果相近。

In order to compare the zenith tropospheric delay（ZTD）estimated by precise point positioning（PPP）using BDS and GPS data respectively under the conditions of the existing constellation,the solutions by BDS only,GPS only and combined BDS/GPS are presented and analyzed.We use real tracking data of a single day from IGS and MGEX stations with precise orbit and precise satellite clocks obtained from CODE and WHIGG.The experimental results show that an accuracy of X mm level can be achieved by GPS,while less than 2cm can be achieved by BDS compare to IGS ZTD products.This suggests that a more accurate result is obtained by GPS than BDS.In addition,a similar result is achieved by combined GPS/BDS as compared to that of GPS only.