Study On BDS/GPS Integer Ambiguity Resolution Algorithm

In the precision navigation and positioning, determining the integer ambiguity is a key issue positioning, accurate and fast ambiguity solver is very important to ensure the positioning accuracy, shorten the positioning time and improve the efficiency of targeting. In this paper, the double difference observation equations and linear equations were introduced in detail. For GNSS ambiguity solver, describes the principles, models and algorithms of their solving, simultaneously we propose a new method for ambiguity resolution according to several fast methods of solving ambiguity, at last,with the new experimental data the new algorithm is validated. The main contents of this paper are as follows:1. The coordinate calculation method of BDS and GPS systems at different respective satellite broadcast ephemeris.2. The constitutions of GNSS system are summarized, at the same time,an study about the three types of GNSS, that is associated with the receiving device, satellite, signal propagation of the error, is researched and the size of these three types of errors and effective correction method in the Baseline Solution.3. In the pretreatment of baseline solution, we study the unified space-time reference, the various types of satellite position calculation cycle slip detection and repair of theory, the ambiguity fixing policy, the application of different frequency measurements with a linear combination,and the stochastic model for the Baseline Solution is put forward.4. A new method about ambiguity resolution were implemented, and we verify the feasibility of the algorithm in conjunction with the measured data.