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Progress of Geodetic Data Processing for 60 Years in China Part 2:Progress of Parameter Estimation Theory and Methodology

YANG Yuanxi,ZHANG Liping (Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China)  
The theory and methodology of the parameter estimation are the fundamental of data processing.By continuous working for 60 years,the Chinese geodesists have developed the quasi-stable adjustment principle,robust estimation based on equivalent weight principle,robust estimation for correlated observations,adaptively robust filters etc.The free net adjustment methodologies,semi-parameter estimation,estimation for ill-posed problems have also been researched in detail.Some new theories and methodologies have been established which promote the geodetic data processing.In this paper,the emphases are on the progresses of the parameter estimation principles contributed by Chinese geodesists.
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