EFFECT OF HEIGHT DIFFERENCE ON GPS VERTICAL ACCURACY
Dai Wujiao; Chen Zhaohua ;and Liang Ming
Department of Survey Engineering and Geomatics, Central South University, Changsha 410083
Abstract When the height difference between the ends of the baseline is large, the tropospheric delay can not be mitigated by the usually used double difference technology even if the length of the baseline is short. It is caused by the different weather condition between the ends of the baseline with large height difference. In order to analyze the height difference effect on GPS vertical accuracy, the several computing tests were carried out by using the data from Hong Kong GPS reference network. Some conclusions can be drawn from these test results. The first, the residual tropospheric delay will be big without using empiric tropospheric delay model and standard atmosphere model when the height difference is large. The second, the errors of meteorology observation on sea level will bring about some errors in GPS vertical direction even the empiric tropospheric delay model and standard atmosphere model are used. The third, observations for a long time can smooth some stochastic effects of the residual tropospheric delay.\
Key words :
GPS
height difference
tropospheric delay
height
baseline
Received: 01 January 1900
Corresponding Authors:
Dai Wujiao
Cite this article:
Dai Wujiao,Chen Zhaohua,and Liang Ming. EFFECT OF HEIGHT DIFFERENCE ON GPS VERTICAL ACCURACY[J]. , 2009, 29(3): 80-83.
Dai Wujiao,Chen Zhaohua,and Liang Ming. EFFECT OF HEIGHT DIFFERENCE ON GPS VERTICAL ACCURACY[J]. jgg, 2009, 29(3): 80-83.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2009/V29/I3/80
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