利用Multi-GNSS估计天顶对流层延迟  

Zenith Tropospheric Delay Estimation Based on Multi-GNSS

作　　者：张士柱 李莎莎 肖伟 林晓静 孙小超 魏以宽 唐晓霏 ZHANG Shizhu

机构地区：[1]湖北省测绘工程院 [2]32022部队 [3]武汉大学测绘学院

出　　处：《地理空间信息》2019年第5期68-72,I0003,共6页Geospatial Information

基　　金：精密工程与工业测量国家测绘地理信息局重点实验室开放基金资助项目(PF2011-23)

摘　　要：利用PPP技术估计对流层延迟,并设计实验对比分析了各单系统和多系统组合下对流层延迟的估计精度;讨论了不同对流层投影函数对对流层延迟估值的影响;最后以武汉市为例,探讨了对流层延迟与季节变化的相关性。结果表明,利用PPP估计的GPS ZTD、BDS ZTD、GLONASS ZTD、GPS/BDS ZTD、GPS/GLONASS ZTD、GPS/BDS/GLONASS ZTD精度均优于2 cm,且组合系统估计的对流层延迟明显比单系统稳定,精度明显提高;不同对流层投影函数对单系统估计影响较大,对组合系统估计影响较小;武汉市夏季对流层延迟大于冬季,但冬季对流层延迟的湿延迟变化较大,夏季对流层延迟的湿延迟变化小。In this paper, based on PPP technology, we compared and analyzed the zenith tropospheric delay (ZTD) precision obtained from the single GNSS system and the combined systems at first. Then, we discussed the performance of different projection functions in ZTD estimation. Finally, with the data collected from Wuhan, we analyzed the correlation between ZTD and seasonal change. The results show that the precision of ZTD estimated by PPP technology, data from single system of GPS/BDS/GLONASS, two-combined and three-combined can all achieve better than 2 cm. However, the multi- GNSS combined systems are more reliable and have a much higher precision. Different projection functions have a larger influence on ZTD estimation in single GNSS system than multi-GNSS combined systems. In addition, the seasonal effect of ZTD delay is obvious. The ZTD is larger in summer than winter, and conversely, the wet component is larger in winter than summer.

关 键 词：对流层延迟 PPP精密定位 投影函数 多系统 

分 类 号：P228.4[天文地球—大地测量学与测量工程]