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《Acta Scientiarum Naturalium Universitatis Pekinensis》 2008-01
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Methods of Estimation of GPS Instrumental Bias from Single Site's GPS Data and Comparative Study of Results

LI Qiang 1,2 , FENG Man 1 , ZHANG Donghe 1, , XIAO Zuo 1 , SHI Liqin 3 1Department of Geophysics, Peking University,Beijing 100871; 2China Aerospace Science & Industry Academy of Information Technology,Beijing 100037; 3Center for Space Science and Applied Research, Chinese Academy of Sciences,Beijing 100080;  
The major error sources of deriving TEC from GPS observational data are instrumental biases. Two methods of extracting TEC and instrumental biases based on single site's GPS observations, called Kalman filter and self adjusted cell methods respectively, are presented. TEC and instrumental biases were computed by using these two methods from GPS data at several sites in 2004. The results were analyzed respectively and then compared with each other. The results also were compared with corresponding values published by CODE (Center for Orbit Determination in Europe).Its statistical characteristics with respect to the latitude of observational site were discussed. The main results can be concluded that the proposed methods can be used to derive TEC and instrumental biases which are accuracy enough with respect to CODE's published values. The standard deviations of derived instrumental biases are related to latitudes of observational sites. For China region, based on the paper's computational results, it shows that the sites with lower latitude are related with larger deviation, which is a implication that ionosphere is more complex in low latitude area than that in mid latitude and more caution should be paid in using the assumption of simple smooth ionospheric model in lower latitude.
【Fund】: 国家自然科学基金(40674089 40636032);; 国家重点基础研究发展计划(2006CB806306);; 北京市教委共建项目(XK100010404)资助项目
【CateGory Index】: P228.4
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