利用Multi-GNSS估计天顶对流层延迟
|
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 multiGNSS 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.
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 multiGNSS 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.
引文
[1]Gaffen D J,Elliott W P,Robock A.Relationships Between Tropospheric Water Vapor and Surface Temperature as Observed by Radiosondes[J].Geophysical Research Letters,2013,19(18):1 839-1 842
[2]何锡扬,张小红,李星星,等.PPP估计天顶对流层延迟方法与结果分析[J].测绘信息与工程,2010(1):3-5
[3]蔡昌盛,夏朋飞,史俊波,等.利用GPS/GLONASS组合精密单点定位方法估计天顶对流层延迟[J].大地测量与地球动力学,2013,33(2):54-57
[4]范磊,钟世明,潭冰峰,等.基于BDS与GPS精密单点定位的天顶对流层延迟估计比较[J].大地测量与地球动力学,2015,35(1):67-71
[5]陈振国,唐龙江.BDS/GPS组合天顶对流层延迟的精度分析[J].测绘工程,2017,26(9):5-9
[6]Niell A E.Global Mapping Functions for the Atmosphere Delay at Radio Wavelengths[J].Journal of Geophysics Research,1996,101(B2):3 227-3 246
[7]Boehm J,Kouba J,Schuh H.Forecast Vienna Mapping Functions1 for Real-time Analysis of Space Geodetic Observations[J].Journal of Geodesy,2009(83):397-401
[8]Boehm J,Niell A,Tregoning P,et al.Global Mapping Function(GMF):a New Empirical Mapping Function Based on Numerical Weather Model Data[J].Geophysical Research Letters,2006,33(7):199-208
[2]何锡扬,张小红,李星星,等.PPP估计天顶对流层延迟方法与结果分析[J].测绘信息与工程,2010(1):3-5
[3]蔡昌盛,夏朋飞,史俊波,等.利用GPS/GLONASS组合精密单点定位方法估计天顶对流层延迟[J].大地测量与地球动力学,2013,33(2):54-57
[4]范磊,钟世明,潭冰峰,等.基于BDS与GPS精密单点定位的天顶对流层延迟估计比较[J].大地测量与地球动力学,2015,35(1):67-71
[5]陈振国,唐龙江.BDS/GPS组合天顶对流层延迟的精度分析[J].测绘工程,2017,26(9):5-9
[6]Niell A E.Global Mapping Functions for the Atmosphere Delay at Radio Wavelengths[J].Journal of Geophysics Research,1996,101(B2):3 227-3 246
[7]Boehm J,Kouba J,Schuh H.Forecast Vienna Mapping Functions1 for Real-time Analysis of Space Geodetic Observations[J].Journal of Geodesy,2009(83):397-401
[8]Boehm J,Niell A,Tregoning P,et al.Global Mapping Function(GMF):a New Empirical Mapping Function Based on Numerical Weather Model Data[J].Geophysical Research Letters,2006,33(7):199-208