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《Science of Surveying and Mapping》 2005-02
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Variance component's estimation in the combined adjustment

CHENG Ying-yan~①,CHENG Peng-fei~①,GU Dan-sheng~①,ZHANG Li~①,BEI Jin-zhong~①,GUO Chun-xi~②,PANG Shang-yi~②(①Chinese Academy of Surveying and Mapping,Beijing 100039,China;②Geodetic Data Processing Centre of State Bureau of Surveying and Mapping)  
Various kinds of observations,such as direction observations of different orders,traverse distance observations,astronomical azimuth observations and 3-D geocentric coordinates of GPS control points,have been involved in thecombined adjustment of the Spacial GPS Network and the Astro-geodetic Network.Weight ratios among them are difficult to set reasonablly.Thus,the best setting of the weight ratios among various observations becomes the key problem in the combined adjustment.This paper mainly discusses the simlified Helmet Model and Baumker formula which have been commonly used in variance analyse.As an example,observables of ten thousand of Astro-geodetic points were processed with the above-mentioned methods.Some significent conclusions are reached by comparing the results and the ratio of prior to post covariance.
【Fund】: 国家测绘局国家基础测绘项目 ( 1 4 6 9990 3 2 4 2 1 4 )
【CateGory Index】: P228.4
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