| This thesis analyzed various error resources in GPS surveying and advanced appropriate correction measures; It introduced theory and method that estimate parameter in reliability study, and then, deduced adjustment mathematic model of GPS network; Based on analyzing characteristics of reliability study of GPS network and outlier analysis, it carried profoundly out study on issue about reliability of GPS network, deduced and summarized target of reliability of GPS network, including redundant observation component of GPS baseline vector and inside & outside reliability index, advanced a theory about reliability of GPS network based on correlative analysis, and summarized methods that improve reliability of GPS network; It worked out a software of reliability analysis about GPS observation, which made reliability analysis automatic and convenient.
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