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Compared with conventional RTK,Network RTK possesses the advantages of wide coverage,high real-time positioning accuracy,high reliability and etc.,which becomes a hot spot in the field of high-precision positioning with its wide application range.The positioning principle of BDS/GPS Network RTK algorithm and the processing strategies of observation errors are explored,based on which,the resolution algorithm of integer ambiguities of double difference carrier phase between reference stations for BDS/GPS is researched.Then a high-precision BDS/GPS error processing model is established within the coverage range of reference stations.Further,the error processing of the mobile station is made by using the method of regional error correction between BDS/GPS reference stations.After that,the integer ambiguity resolution method of BDS/GPS carrier phase in mobile station is studied.