Impact of Deviation of GPT Model and GPT2 Model on Positioning Results

doi:10.13474/j.cnki.11-2246.2018.0021

Abstract

Abstract:

The global models of pressure and temperature GPT and GPT2 can be used to obtain meteorological elements such as pressure and temperature of GPS sites,which play an important role in calculating tropospheric delay and are widely used in high precision GPS data analysis.The improvement of GPT2 model to GPT model has been validated in many literatures while there is no detailed analysis on the deviations of coordinate time series obtained by using these two models respectively.In this paper,we use the GPT model and GPT2 model to deal with the same continuous observation data respectively.As a result,we find that the seasonal variation of the deviation of the pressure leads to the seasonal variation of the site vertical positioning estimates,which is one of the sources that lead to aliased seasonal signals.Simultaneously,the influence of the deviation of the pressure on the site vertical positioning estimates is related to the site latitude,showing that the ratio of the deviation of the priori zenith delay to the vertical position is increased as the latitude of the site increases.

Key words: GPT, GPT2, GPS, tropospheric delay, positioning results

CLC Number:

P228

ZHENG Yun, WANG Hongdong. Impact of Deviation of GPT Model and GPT2 Model on Positioning Results[J]. 测绘通报, 2018, 0(1): 112-116.

References

[1] DAVIS J L,HERRING T A,SHAPIRO I I,et al.Geodesy by Radio Interferometry:Effects of Atmospheric Modeling Errors on Estimates of Baseline Length[J].Radio Science,1985,20(6):1593-1607.
[2] BÖEHM J,MÖLLER G,SCHINDELEGGER M,et al.Development of an Improved Empirical Model for Slant Delays in the Troposphere(GPT2w)[J].GPS Solutions,2015,19(3):433-441.
[3] BÖEHM J,HEINKELMANN R,SCHUH H.Short Note:A Global Model of Pressure and Temperature for Geodetic Applications[J].Journal of Geodesy,2007,81(10):679-683.
[4] LAGLER K,SCHINDELEGGER M,BÖEHM J,et al.GPT2:Empirical Slant Delay Model for Radio Space Geodetic Techniques[J].Geophysical Research Letters,2013,40(6):1069-1073.
[5] HOPFIELD H S.Two-quartic Tropospheric Refractivity Profile for Correcting Satellite Data[J].Journal of Geophysical Research,1969,74(18):4487-4499.
[6] SAASTAMOINEN J.Atmospheric Correction for the Troposphere and Stratosphere in Radio Ranging Satellites[J].The Use of Artificial Satellites for Geodesy,1972,15(6):247-251.
[7] BÖEHM 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):L07304.
[8] BOEHM J,WERL B,SCHUH H.Troposphere Mapping Functions for GPS and Very Long Baseline Interferometry from European Centre for Medium-Range Weather Forecasts Operational Analysis Data[J].Journal of Geophysical Research:Solid Earth,2006,111(B2):1059-1075.
[9] NIELL A E.Global Mapping Functions for the Atmosphere Delay at Radio Wavelengths[J].Journal of Geophysical Research:Solid Earth,1996,101(B2):3227-3246.
[10] TREGONING P,HERRING T A.Impact of a Priori Zenith Hydrostatic Delay Errors on GPS Estimates of Station Heights and Zenith Total Delays[J].Geophysical Research Letters,2006,33(23):L23303.
[11] 王洪栋,王敏.测站气温与气压对GPS定位结果的影响[J].大地测量与地球动力学,2016,36(4):323-326.
[12] 姚宜斌,曹娜,许超钤,等.GPT2模型的精度检验与分析[J].测绘学报,2015,44(7):726-733.
[13] HERRING T A,KING R W,MCCLUSKY S C.GAMIT Reference Manual:GPS Analysis at MIT[M].Boston:Massachussetts Institute Technology,2010:1-171.
[14] HERRING T A,KING R W,MCCLUSKY S C.GLOBK Reference Manual:Global Kalman Filter VLBI and GPS Analysis Program[M].Boston:Massachussetts Institute Technology,2010:1-91.
[15] DONG D N,FANG P,BOCK Y,et al.Anatomy of Apparent Seasonal Variations from GPS Derived Position Site Time Series[J].Journal of Geophysical Research,2002,107(B4):ETG 9-1-ETG 9-16.
[16] PETIT G,LUZUM B,AL E.IERS Conventions(2010)[M].[S.l.]:IERS,2010.