車(chē)載導(dǎo)航系統(tǒng)中數(shù)據(jù)處理與地圖匹配技術(shù)研究
[Abstract]:The vehicle navigation system usually takes the GPS receiver as the main means of positioning, and displays the position information to the user by embedded map display. The GPS receiver mainly includes three parts: signal receiving, baseband processing and positioning solution. The performance of map display is mainly determined by the spatial structure of map data and map matching algorithm. With the rapid development of intelligent transportation system and the continuous improvement of Beidou second generation navigation system constellation, the domestic vehicle navigation system is developing rapidly. It is helpful to master the key technologies of satellite navigation and its vehicle applications, and provides a theoretical basis for the development of applications based on Beidou satellite navigation. In this paper, the key data processing technology involved in GPS vehicle navigation system is studied, and the solution and implementation method are determined through analysis. The main contents are as follows: (1) based on the analysis and establishment of FPGA/DSP as the hardware implementation scheme of GPS receiver, the reasonable configuration method is determined by studying the working principle of RF chip. In order to improve the output frequency of GPS positioning result, the scheme of baseband processing module is implemented by FPGA logic unit. C / A code, carrier repetition module, coherent integration module, loop filter module and sub-frame synchronization module are designed. (2) in order to transmit the pseudo-range-related information from the baseband processing results to DSP quickly, the channel usable detection register, pseudo-range latch trigger register and ephemeris cache reading register are designed by using EMIF (External Memory Interface) interface. Calendar cache read registers to ensure the accuracy and ease of data transmission. (3) the key problems of positioning solution in DSP hardware platform are analyzed, and the advantages and disadvantages of two pseudo-range acquisition methods are emphatically discussed. The error of approximate calculation of satellite orbit is simulated and analyzed, and the data processing of DSP navigation solution is completed. The matters needing attention in concrete implementation are summarized. (4) as an important part of vehicle navigation system, the structure of map data directly affects the time complexity and space complexity of map program. In order to improve the speed of map data extraction by map display and map matching program, a spatial data construction scheme with the functions of spatial index, name index and road topology is proposed, which consists of six kinds of table files. The correctness and practicability of the scheme are verified by programming. (5) in order to analyze the tolerance of map matching algorithm to different location errors, a scheme of generating simulated location data based on actual map road data and actual GPS error model is proposed. Finally, the common map matching algorithms are analyzed, and the simulation results are compared with the converted map data, and the error tolerance results of different algorithms are obtained. It provides a theoretical basis for the practical map matching scheme design based on these algorithms.
【學(xué)位授予單位】:哈爾濱工程大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類(lèi)號(hào)】:TN967.1;TP368.1
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