PRECISION ASSESSMENT OF ZENITH TROPOSPHERIC DELAY
CALCULATED FROM EGNOS MODEL OVER ASIAN AREA
1)College of Geomatic Engineering and Geoinformatics, Guilin University of Technology, Guilin 541004
2)Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin 541004
Abstract:The tropospheric delay is a main error source for the global satellite navigation and positioning, and the EGNOS model can be used to calculate the zenith tropospheric delay.The Zenith Tropospheric Delay (ZTD) data observed from 48 International GNSS system (IGS) sites which distributed in Asian area are used to assess the effectiveness and accuracy of ZTD calculated from EGNOS model in 20092011, and the application of the EGNOS model is also analyzed in Asian area. The results show:1) relative to IGS observed ZTD, the bias and Root Mean Square(RMS) for ZTD calculated from the EGNOS model are -0.18 cm and 5.98 cm respectively in Asian area, and the bias and RMS are 0.81 cm and 6.13 cm respectively in China.2) The bias and RMS show a obvious seasonal variation. The bias generally shows the largest value in the summer and the smallest values in the autumn, while the RMS shows the largest value in the summer and the smallest values in the winter.3) The relation between the bias and the altitude or latitude is not obvious, but the RMS decreases with the increasing altitude or latitude, and the bias and RMS show a relative smaller valves in high latitude of the northern and western areas.4)The daily bias and RMS at low latitude of southern area and eastern area in the summer have a relatively larger variation.
Huang Liangke,Liu Lilong,Zhou Miao et al. PRECISION ASSESSMENT OF ZENITH TROPOSPHERIC DELAY
CALCULATED FROM EGNOS MODEL OVER ASIAN AREA[J]. jgg, 2013, 33(4): 128-132.