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Robust Fitting of Covariance Function

LIU Nian(The First Topography Surveying Team of the National Bureau Surveying and Mapping, Xi'an 710054,China)  
If least squares collocation is used in the field of interpolation of gravity anomalies and height anomalies, and if outliers are contained in observation, the covariance function fitted by these data can not reflect the statistical relation of the approximation field. From the course of fitting of covariance function, the author analyzed the property of non ro bust in it, and put forward to a technique of robust fitting.
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