Study Of The Integer Ambiguity Resolution In The RTK System

The single frequency RTK(Real Time Kinematic) is the important technology to reduce the cost of terminal and improve the precision of positioning, the integer ambiguity resolution is one of the key technologies for RTK. Based on the actual requirement of RTK system, this dissertation has a deep research on the fast algorithm of the integer ambiguity resolution in the RTK.The major content is as follows:Firstly, the components, the theory of RTK system are introduced. At the same time, the reason of main errors of the RTK system is discussed. After comparing some algorithms for the integer ambiguity resolution, the LAMBDA algorithm is regarded as a more effective algorithm considering application, time and the control of searching candidates and is discussed in this dissertation.The two key factors of ambiguity resolution are the accuracy of the float solution and the efficiency of the searching method. This dissertation has a relatively thorough study on how to promote this two factors, and synthesizes the TIKHONOV regularization method, the united ambiguity de-correlation method and the sequential conditional least-squares adjustment search algorithm as a compositive ambiguity resolution strategy. First, some TIKHONOV regularization methods have been studied to mitigate the ill-condition in single frequency rapid positioning. They can not only reduce the number of epochs for correct ambiguity integers, but also accelerate the searching of ambiguity integers. Secondly, the united ambiguity de-correlation method and iterative method are used to promote the efficiency of the search program further more. The experiment shows that the former is more steadiness and effective in dealing with the ill-decomposition because of the round error and noise.This dissertation constructs the simulating system. The module test and system test are used to validate the performance of compositive algorithm in the mixing constellation of BD-2 system. The results show that this method can resolve the correct ambiguity integers in the high success rate. RTK system can use this method to be initialized.The results in this dissertation can be applied to the monitoring receiver and control station of BD-2 system. It can provide the technology for the use of single frequency RTK technology in BD-2 system.