Research and implementation of dual-freq carrier positioning for satellite receiver

Based on summarizing the research of relative positioning principle, the factors and disadvantages which affect the result of pseudorange positioning are analyzed in this paper. The mathematical model of dual-frequency carrier-phase differential positioning algorithm is given, which make a transformation between pseudorange and carrier-phase measurements. In order to make liberalized solution for the model, the least square method is used. LAMBDA is chosen as the solution of the integer ambiguity, a critical problem in carrier-phase positioning. Finally the flow chart for the program of dual-frequency carrier-phase differential positioning algorithm is designed. The implementation of the algorithm on the TMS320C6747 hardware platform is given, verifying the feasibility.