An Analysis for the Accuracy of Tropospheric Zenith Delay Calculated From ECMWF/NCEP Data Over Asia

2012 ◽  
Vol 55 (3) ◽  
pp. 275-283 ◽  
Author(s):  
Qin-Ming CHEN ◽  
Shu-Li SONG ◽  
Wen-Yao ZHU
Keyword(s):  
Zenith Delay ◽  
Tropospheric Zenith Delay

scholarly journals Estimation of tropospheric zenith delay and gradients over the Madrid area using GPS and WVR data

1999 ◽  
Vol 26 (4) ◽  
pp. 447-450 ◽  
Author(s):  
G. Ruffini ◽  
L. P. Kruse ◽  
A. Rius ◽  
B. Bürki ◽  
L. Cucurull ◽  
...  
Keyword(s):  
Zenith Delay ◽  
Tropospheric Zenith Delay

The impact of solid Earth-tide model error on tropospheric zenith delay estimates and GPS coordinate time series

Survey Review ◽  
2017 ◽  
Vol 50 (361) ◽  
pp. 355-363
Author(s):  
Fei Li ◽  
Jintao Lei ◽  
Shengkai Zhang ◽  
Chao Ma ◽  
Weifeng Hao ◽  
...  
Keyword(s):  
Time Series ◽  
Solid Earth ◽  
Earth Tide ◽  
Model Error ◽  
Coordinate Time ◽  
Zenith Delay ◽  
Tropospheric Zenith Delay ◽  
The Impact ◽  
Gps Coordinate Time Series ◽  
Solid Earth Tide

scholarly journals A Simulation Study on Triple Frequency Ambiguity Resolution for Reference Stations Using Different Strategy Regarding Elevation angles

2019 ◽  
Vol 94 ◽  
pp. 01024
Author(s):  
Sun-Kyoung Yu ◽  
Dong-uk Kim ◽  
June-sol Song ◽  
Changdon Kee
Keyword(s):  
Ambiguity Resolution ◽  
Measurement Errors ◽  
Elevation Angle ◽  
High Elevation ◽  
Observation Data ◽  
Model Errors ◽  
Zenith Delay ◽  
Tropospheric Zenith Delay ◽  
Triple Frequency ◽  
Integer Rounding

This paper proposes an ambiguity resolution method using triple frequency for reference stations. Using the reference coordinate information, geometry based ambiguity resolution performance is analysed. Although orbit errors and tropospheric model errors still remain, wide lane ambiguity could be fixed in several epochs. However, the narrow lane wave length of about 10cm is too short to overcome error sources by simply combining the measurement. Therefore, we have divided the elevation angle into 5 degree intervals and investigated the measurement errors and the time to fix of each section. For high elevation satellites, it is possible to determine in several epochs by integer rounding. On the other hand, if the elevation is lower than 30 degrees, the tropospheric zenith delay must be estimated with ambiguities. The proposed algorithm estimates ambiguities and tropospheric zenith delay simultaneously utilizing ambiguity free observations of high elevation satellites. Ambiguities for high elevation satellites are resolved by integer rounding in several epochs. The algorithm has been verified by generating the simulated observation data for the ‘Cheon-an’ and ‘Boen’ reference stations in the Korea.

The Best Number of IGS Stations by Grouping Network for Solving Total Zenith Delay

2010 ◽  
Vol 121-122 ◽  
pp. 764-768
Author(s):  
Ying Chun Yue ◽  
Zhi Chao Zhang ◽  
Pan Xiong
Keyword(s):  
Real Time ◽  
High Precision ◽  
Weather Forecast ◽  
Massachusetts Institute Of Technology ◽  
Zenith Delay ◽  
Geological Disasters ◽  
Total Zenith Delay ◽  
Adverse Weather ◽  
Observational Station ◽  
Institute Of Technology

Short-term adverse weather conditions have a direct impact on geological disasters. However, the data source of high-precision weather on real time can be provided by GPS technology. At the same time, the high-precision and real-time weather forecast can provide important and basic information for geological disasters monitoring, forecasting and prevention. However, the precision of the total zenith delay in troposphere directly affects the estimating precision of the water vapor contents over stations, which affects the accuracy of real-time weather forecast. In this paper, the total zenith delay of GPS observational station is solved respectively by GPS data on GPS observational station grouped with different IGS stations using high-precision software-GAMIT/GLOBK developed by the Massachusetts Institute of Technology. The solving results are comparatively analyzed to draw：the best number of IGS tracking stations by grouping network for improving the precision of the total zenith delay in troposphere is 3. It is of great realizable significance.

Analysis of Regional Distribution and Change of Tropospheric Delay

2014 ◽  
Vol 577 ◽  
pp. 1189-1192
Author(s):  
Hai Shen Wang ◽  
Chuang Shi ◽  
Yun Chang Cao
Keyword(s):  
Standard Deviation ◽  
Tibetan Plateau ◽  
Regional Distribution ◽  
Tropospheric Delay ◽  
The Tibetan Plateau ◽  
Total Delay ◽  
Zenith Total Delay ◽  
Tropospheric Zenith Delay ◽  
Absolute Bias ◽  
Tropical Monsoon

In this article, data of stations distributed over China was used to calculate tropospheric delay. The result was compared with the tropospheric zenith delay calculated from model. The rules and Characteristic of tropospheric delay over China was analyzed from the aspect of altitude, climate, and change. The results showed that the tropospheric zenith total delay decreased from the coast to the central and western regions, the Tibetan plateau is minimum. Zenith wet delays computed from the models also show an absolute bias of over 20 mm with respect to that of sounding data. The standard deviation is more than 30 mm in the tropical monsoon zone.

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