Study Of Precise Single Point Positioning Ground High-Precision Local Positioning System

Ground high-precision local positioning system(GH-LPS)is a new type of radio positioning system proposed to overcome the problem that the global navigation satellite system(GNSS)is susceptible to jamming and interference,resulting in degrading performance or even uselessness,such as the quality of the transmitted signal,the synchronization accuracy of the base station time,and the processing performance of the receiver for the navigation signal,are introduced.The focus is on the positioning solution model and the fuzzy degree fixed model.Based on GH-LPS,this paper carries out the following research work on the design and optimization of the base station layout algorithm for ground-based high-precision regional positioning system:1.Studying the method of positioning the navigation system of the foundation.Simulations have been carried out to test four fixed base stations by using commonlyused mathematical models for the problems of base station fixation of ground-based positioning system and equation within ill-posed error of positioning data in the post-processing,such as ridge estimation,truncated singular values and the analysis of improvement of positioning result for least square in TIKHONOV regularization.2.Coming up with the design for using the drone equipped pseudo-satellite platform in fast and high-performance of positioning algorithm based on the station fixation of ground-based navigation system.In the simulation,the single-difference carrier observation equation is used for the positioning solution,and the On the Fly(OTF)ambiguity resolution method is used to design the corresponding TIKHNOV regularization matrix for the observation equation of the OTF solution.By comparing with the ambiguity floating point solution,the ambiguity covariance matrix and the baseline floating point solution positioning time,it is possible to determine the relative fixed base station.The addition of TIKHONOV regularization can improve the ambiguity resolution accuracy to some extent,and the aerial pseudolite platform The addition can not only make the positioning result converge quickly,but also improve the positioning accuracy of the ambiguity floating point solution.The combination of the two can optimize the positioning algorithm.3.Studying the fixed algorithm of the integer ambiguity.Compared with the positioning accuracy of the floating-point solution,the positioning accuracy for the fixed solution is obviously improved,and the LAMBDA,FARA,and FASF ambiguity search algorithms were also compared and verified.The basic principle of fixed ambiguity is introduced and deduced to verify its effectiveness of the whole-week fuzzy fixed algorithm.4.Carrying out a ground-based positioning experiment,using the method of static initialization(KPI)ambiguity and building the inter-satellite single-difference carrier observation equation to solve the ambiguity to verify the effectiveness of the proposed algorithm.Firstly,obtain the ambiguity floating point solution and its covariance matrix.Secondly,fix the ambiguity by using the most suitable ambiguity fixed search algorithm LAMBDA algorithm.Finally,the fixed solution of the ambiguity is obtained,and then the carrier observation equation is substituted to obtain the baseline fixed solution.The experimental results show the availability of the system and verify the effectiveness of the algorithm.