導航信號生成及捕獲方法研究
本文關鍵詞: GPS GALILEO 導航信號調制方式 匹配濾波捕獲 出處:《中國科學院研究生院(國家授時中心)》2013年碩士論文 論文類型:學位論文
【摘要】:隨著GPS現(xiàn)代化和其他新興導航定位系統(tǒng)如Galileo系統(tǒng)、“北斗二代”衛(wèi)星導航系統(tǒng)的逐步開發(fā)完善,新型信號調制技術正在逐步取代舊式PSK-R信號調制技術,BOC信號調制技術應運而生。BOC調制信號具有顯著的頻譜分裂特性,能與原有的衛(wèi)星導航信號互相兼容,同時可以使導航系統(tǒng)獲得更高的跟蹤精度和抗多徑干擾性能。BOC調制方式具有廣闊的應用前景,,其同步技術的研究引起了國內外廣大學者的重視。 本論文的主要研究內容如下: 1.介紹了國際上正在使用的GNSS系統(tǒng)概況,并對幾種GNSS系統(tǒng)的信號調制方式進行了研究。以Galileo E1頻段和GPS L1頻段為重點,深入分析了CBOC信號調制方式和TMBOC調制方式的調制原理;以Galileo E5頻段為重點深入分析比對雙碼AltBOC、標準AltBOC和恒包絡AltBOC信號調制方式的調制原理。 2.研究了GPS L1、GalileoE1和E5頻段導航信號生成技術:通過數(shù)學推導產(chǎn)生GPS C/A碼和GPS Weil碼,并仿真出GPS L1頻段信號;研究了Galileo E1頻段信號,并用MATLAB仿真了E1頻段的數(shù)據(jù)通道信號和導頻通道信號;研究了Galileo E5頻段的信號組成、擴頻碼生成及子載波生成等內容,并通過MATLAB仿真了Galileo E5信號。 3.介紹了傳統(tǒng)導航信號的捕獲方法,分析了各種導航信號的跟蹤精度和多徑誤差,重點研究了基于FFT匹配濾波器捕獲算法,從原理和實現(xiàn)兩個方面研究了能夠并行處理的匹配濾波器算法,并用此方法完成了對GPS L1民用導航信號的捕獲并獲得捕獲結果。
[Abstract]:With the modernization of GPS and other emerging navigation and positioning systems such as Galileo system, the "Beidou second generation" satellite navigation system is gradually developed and perfected. New signal modulation technology is gradually replacing the old PSK-R signal modulation technology. It can be compatible with the original satellite navigation signal, and can make the navigation system achieve higher tracking accuracy and anti-multipath interference performance. BOC modulation has a broad application prospects. The research of synchronization technology has attracted the attention of scholars at home and abroad. The main contents of this thesis are as follows: 1. The general situation of GNSS system in the world is introduced. The signal modulation modes of several GNSS systems are studied. The emphasis is on the Galileo E1 band and the GPS L1 band. The modulation principle of CBOC signal modulation and TMBOC modulation is analyzed. The modulation principle of dual code AltBOC, standard AltBOC and constant envelope AltBOC signal modulation is analyzed in detail in Galileo E5 band. 2. The technique of generating navigation signal in GPS L1G GalileoE1 and E5 band is studied. The GPS C / A code and GPS Weil code are generated by mathematical derivation. The GPS L1 band signal is simulated. The Galileo E1 band signal is studied, and the data channel signal and pilot channel signal of E1 band are simulated by MATLAB. The signal composition, spread spectrum code generation and subcarrier generation of Galileo E5 band are studied, and the Galileo E5 signal is simulated by MATLAB. 3. The traditional navigation signal acquisition method is introduced, the tracking accuracy and multipath error of various navigation signals are analyzed, and the acquisition algorithm based on FFT matched filter is studied emphatically. The matched filter algorithm which can be processed in parallel is studied from the aspects of principle and implementation. The acquisition of GPS L1 civil navigation signal is accomplished by this method and the acquisition results are obtained.
【學位授予單位】:中國科學院研究生院(國家授時中心)
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:P228.4
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