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《Crustal Deformation and Earthquake》 2003-03
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OBSERVATION PRECISION OF BASIC NETWORK OF CMONOC

Wang Qi , Niu Zhijun and Shi Juncheng {3)\} 1)Institute of Seismology,CSB, Wuhan\ 430071 2)Research Center of CMONOC, CSB, Beijing\ 100036 3)Institute of Geotechnical Engineering,AVIC,Beijing\ 100086  
Five-epoch GPS campaigns for basic network of CMONOC were carried out in 1998 through 2002. On the basis of data output processed by GIPSY-software, short-term precision of baseline determination is estimated at 2-5 mm for horizontal component and 7-15 mm for the vertical. The long-term precision is similar to the short-term one in magnitude,this suggests that the highest achievable precision can be obtained from these observations. The baseline uncertainty is attributed to site-dependent errors associated with multi-path signal, un-calibrated propagation delays, unstable marker etc.The length-dependent error associated with orbit determination biases is minor if any , can be ignored for the horizontal.We have drawn the conclution that at least four-year interval is required to precisely determine site displacement rate.
【Fund】： 国家重大科学工程“中国地壳运动观测网络”项目 ;; 国家自然科学基金 (4 0 2 740 0 7)
【CateGory Index】： P542
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