北斗区域系统解算对流层天顶延迟比对分析

在分析了当前GNSS主要的误差源,比较对流层延迟改正模型的基础上,应用Saastamoinen模型对BDS和GPS原始观测数据解算对流层天顶延迟,并对全球6个站点一个月的解算值进行比对分析,结果发现：北斗区域系统解算的ZTD相比于GPS结果,76%位于2cm之内,只有个别站点个别天的解算结果出现较大偏差,在中国周边站点解算结果优于其他地区站点。表明：北斗区域系统已经具备在中国周边同GPS相当的ZTD解算精度,为下一步北斗全球系统的建设奠定了坚实的基础。

Comparative Analysis the Results of Zenith Tropospheric Delay Solved by Beidou Regional System Data

The main error sources of GNSS are analyzed, and the tropospheric delay cor rection models are compared. By using Saastamoinen model, the solving results of tropospheric zenith delay with BDS and GPS raw data were compared and analyzed by comparing the six global sites data of one month. The results suggest that 76 percent of the ZTD solved by Beidou Regional System data ranges from-2 cm to ＋2 cm compared to the GPS, and only some of large error happened in someday of some stations. However, the results of the sites near from China are better than the other sites solved by Beidou Regional System. It shows that the Beidou Regional System already has the similar solving-precision in and a- round China with GPS, and this has laid a good foundation for the BDS globalization.