The Ambiguity Algorithm Research For GPS/GLONASS Combination Of Network RTK

In recent years, network RTK has become a new technology,which is built up on the basis of conventional RTK and differential GNSS.The network RTK can make a region mapping work to become an organic whole.Network RTK commonly used the GPS single system for data collection.With the modernization of the Russian GLONASS system,greatly increases the availability of GLONASS satellites.The use of GPS/GLONASS combination system has better stability and operating efficiency compared to a single GPS system.Ambiguity correctly solving is the key issues in the network RTK positioning technology.In this paper,the ultimate goal is the GPS/GLONASS combination system ambiguity.Detailed study a series of problems in calculation process,and use VC++6.0Programming to solve the GPS/GLONASS combination system Ambiguity.Firstly,the paper need to resolve the satellite coordinates of the GPS/GLONASS system combination problems.Due to the different contents of the broadcast ephemeris format of the GLONASS system and the GPS system and included ephemeris,the method of orbit calculation is different,the paper focuses on the GLONASS satellite coordinates calculation.Otherwise,GPS/GLONASS system, there is a difference on the basis of time and space,firstly the satellite coordinates need to be unified into a single system.The paper blends the GLONASS space-time basis into the GPS space-time basis.Programming data fusion,and output common-view file.The emphasis of the paper is calculate ambiguity.In the process of calculating ambiguity,first studied cycle slip detection.The method of Ionosphere Residual Error Method and Melbourne-Wubbena combination for cycle slip detecting are analyzed in this paper.Through building up GPS/GLONASS combination of zero-differences, single-differences and double-difference observation equation,using the least squares method and sequential adjustment parameter estimation method to obtain the real solutions of ambiguity.Ambiguity fixing uses LAMBDA algorithm,which is the most advanced method.Finally,detailed analysis the LAMBDA algorithm.