Research And Simulation On The Positioning Arithmetic With GPS Carrier Phase

Recently, with the development and completion of GPS (Global Positioning System), it is not enough to position only by using pseudo, so people begin to pay attention to make use of the GPS carrier phase to realize localized rapidly accurate research, and certainty of carrier phase integer ambiguity resolution is the key technologies among them. The main question of the carrier phase measures is how to make sure the carrier phase integer ambiguity and the determination and recovery of cycle slip. Those two problems will be studied and discussed in this paper, and a carrier phase algorithm function module belonging to GPS analysis and simulation software will be designed and realized.The method and the principle of GPS measures to fix position are introduced in the paper firstly, and then the position technology by using carrier phase allocation technology is introduced further. secondly, the mathematic model of the carrier phase measures are discussed, including several kinds of difference equations and the mathematic model for fixing position relatively that deduced GPS has been amended.Those problems are researched in the paper, through the analyze of the integer ambiguity search technique, and several integer ambiguity search techniques are discussed according to the difference of the observation fields, the integer ambiguity search based on the observation field, the coordinate field and the ambiguity field are included, and some typical algorithm such as the phase group is legal from the carrier phase, Ambiguity Function (AMF) method and LAMBDA (Least-square AMBiguity Decorrelation Adjustment) are introduced, too. And the LAMBDA algorithm is analyzed in detail, and the vector estimation of GPS integer ambiguity and the navigation parameters, and the related covariance matrix are deduced by the use of Markov estimation. After the analysis and the comparison of several integer ambiguity confirm algorithm by processing the exam data, the LAMBDA is proved to be the effective algorithm to realize the dynamic integer ambiguity, a simulate software are designed and the algorithm are simulated. Besides that, several common methods for the detection and the restoration of cycle slips are researched, too. And the double-channel P-code pseudo and the carrier phase are used for the determination and recovery, and the algorithms are certified by the test data. At last, the carrier phase algorithmfunction module—GPS analysis and simulation function module was designedand realized.