方位角对斜路径对流层延迟的影响研究
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摘要
针对4种不同气候条件的地区,分析不同高度角时方位角对斜路径对流层延迟的影响,进而提出一种对流层延迟水平梯度的精化方法。实验表明,该方法可更真实地反映对流层延迟在水平方向的非对称性,有效提高VLBI解算精度,基线可重复度提高约4%,天顶对流层延迟估计精度提高约15%。
Tropospheric delay remains an important source of error. Aiming at four regions with different climatic conditions, this paper analyzes the effects of azimuth on slant tropospheric delay at various elevation angles and then proposes an approach to refine horizontal gradients of this delay. The proposed approach improves solution accuracy of VLBI data efficiently: baseline repeatability is improved by 4%, while improvement is 15% for the accuracy of estimated zenith tropospheric delay.
Tropospheric delay remains an important source of error. Aiming at four regions with different climatic conditions, this paper analyzes the effects of azimuth on slant tropospheric delay at various elevation angles and then proposes an approach to refine horizontal gradients of this delay. The proposed approach improves solution accuracy of VLBI data efficiently: baseline repeatability is improved by 4%, while improvement is 15% for the accuracy of estimated zenith tropospheric delay.
引文
[1] Chen G,Herring T A.Effects of Atmospheric Azimuthal Asymmetry on the Analysis of Space Geodetic Data[J].Journal of Geophysical Research:Solid Earth,1997,102(B9):20 489-20 502
[2] Gardner C S.Correction of Laser Tracking Data for the Effects of Horizontal Refractivity Gradients[J].Applied Optics,1977,16(9):2 427-2 433
[3] Dixon T H,Wolf S K.Some Tests of Wet Tropospheric Calibration for the CASA Uno Global Positioning System Experiment[J].Geophysical Research Letters,1990,17(3):203-206
[4] Ware R,Alber C,Rochen C,et al.Sensing Integrated Water Vapor along GPS Ray Paths[J].Geophysical Research Letters,1997,24(4):417-420
[5] Urquhart L,Nievinski F G,Santos M C.Ray-Traced Slant Factors for Mitigating the Tropospheric Delay at the Observation Level[J].Journal of Geodesy,2013,87(10):981-1 001
[6] Ericsson D,MacMillan D S,Gipson J M.Tropospheric Delay Ray Tracing Applied in VLBI Analysis[J].Journal of Geophysical Research:Solid Earth,2014,119(12):9 156-9 170
[7] Hofmeister A,B?hm J.Application of Ray-Traced Tropospheric Slant Delays to Geodetic VLBI Analysis[J].Journal of Geodesy,2017,91(8):945-964
[8] Petit G,Luzum B.Models for Atmospheric Propagation Delays[C].IERS Conventions 2010,Frankfurt,2010
[9] 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):1 593-1 607
[10] Niell A E.Global Mapping Functions for the Atmospheric Delay at Radio Wavelengths[J].Journal of Geophysical Research,1996,101(B2):3 227-3 246
[11] 郭际明,章迪,史俊波,等.利用射线追踪法分析3种典型对流层映射函数在中国区域的精度[J].武汉大学学报:信息科学版,2015,40(2):182-187(Guo Jiming,Zhang Di,Shi Junbo,et al.Using Ray-Tracing to Analyze the Precision of Three Classical Tropospheric Mapping Functions in China[J].Geomatics and Information Science of Wuhan University,2015,40(2):182-187)
[2] Gardner C S.Correction of Laser Tracking Data for the Effects of Horizontal Refractivity Gradients[J].Applied Optics,1977,16(9):2 427-2 433
[3] Dixon T H,Wolf S K.Some Tests of Wet Tropospheric Calibration for the CASA Uno Global Positioning System Experiment[J].Geophysical Research Letters,1990,17(3):203-206
[4] Ware R,Alber C,Rochen C,et al.Sensing Integrated Water Vapor along GPS Ray Paths[J].Geophysical Research Letters,1997,24(4):417-420
[5] Urquhart L,Nievinski F G,Santos M C.Ray-Traced Slant Factors for Mitigating the Tropospheric Delay at the Observation Level[J].Journal of Geodesy,2013,87(10):981-1 001
[6] Ericsson D,MacMillan D S,Gipson J M.Tropospheric Delay Ray Tracing Applied in VLBI Analysis[J].Journal of Geophysical Research:Solid Earth,2014,119(12):9 156-9 170
[7] Hofmeister A,B?hm J.Application of Ray-Traced Tropospheric Slant Delays to Geodetic VLBI Analysis[J].Journal of Geodesy,2017,91(8):945-964
[8] Petit G,Luzum B.Models for Atmospheric Propagation Delays[C].IERS Conventions 2010,Frankfurt,2010
[9] 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):1 593-1 607
[10] Niell A E.Global Mapping Functions for the Atmospheric Delay at Radio Wavelengths[J].Journal of Geophysical Research,1996,101(B2):3 227-3 246
[11] 郭际明,章迪,史俊波,等.利用射线追踪法分析3种典型对流层映射函数在中国区域的精度[J].武汉大学学报:信息科学版,2015,40(2):182-187(Guo Jiming,Zhang Di,Shi Junbo,et al.Using Ray-Tracing to Analyze the Precision of Three Classical Tropospheric Mapping Functions in China[J].Geomatics and Information Science of Wuhan University,2015,40(2):182-187)