Research And Implementation Of Long Base Line High Precision Positioning

In this paper,we studied how to improve the positioning accuracy of the underwater target,and finish the simulation analysis of the principle of the algorithm and the design and implementation of the software function,which is derived from the long baseline navigation and positioning system.For the long baseline navigation and positioning system,its most important function is to provide a continuous,reliable target trajectory.Therefore,improving the positioning accuracy and reducing the calculation error is the most important work in the positioning system,which is also the difficulty and focus.In this paper,the positioning accuracy is improved by optimizing the localization algorithm and modifying the system error respectively.In the optimizing of localization algorithm,this paper firstly discusses the spherical intersection model and the hyperboloid intersection model commonly used in the long baseline positioning system.This method is simple and intuitionistic,and the computation is small.However,the number of elements needed for each solution is fixed and cannot be solved by using redundant elements.In order to make full use of the pulse information of each element,the iterative formula of long baseline positioning is deduced based on optimization theory.In the presence of ranging error,the distance between the measured point and the geometric distance The mean square error is minimized and the optimal solution of the target position is obtained.The simulation results show that under the same condition,the optimization algorithm is less error than the intersection algorithm and the performance of the algorithm is more stable.In the part of system error correction,the factors that may lead to positioning errors are analyzed and discussed,including timing error,position error,velocity error,target motion,and corresponding solutions are put forward for each case.Object-oriented idea,in the Windows / winning unicorn platform using cross-platform class library Qt to complete the preparation of the various functional modules,the code between the modules independent,low coupling,according to the actual situation to add / remove the various functions,High-precision navigation of the target location.The high-precision positioning algorithm introduced in this paper has been applied to two sets of long baseline navigation and positioning systems,which play an important role in the jointing of water,lake and sea.The performance of the algorithm has been fullyverified.Finally,the data of sea test are analyzed and processed,and the positioning accuracy of the target is given,which satisfies the actual demand.