本文選題：GPS　切入點：軟件接收機　出處：《北京郵電大學》2013年碩士論文

【摘要】：目前,全球定位系統(tǒng)GPS(Global Position System)接收機中算法的研究正隨著全球定位系統(tǒng)(GPS)的飛速發(fā)展而受到業(yè)界越來越多的關注。基于軟件無線電的GPS接收機軟件化的實現(xiàn),以其可編程、易修改、模塊化、對算法適應性強、可擴展性優(yōu)等特點,成為近些年衛(wèi)星導航領域的研究熱點。而捕獲、跟蹤、PVT(Position Velocity Time)解算等算法作為軟件接收機中的關鍵技術,對軟件接收機的性能起著至關重要的作用。通過對這些關鍵算法的研究,可以為我國自主研制的北斗導航接收機提供參考和借鑒。 文中重點對GPS軟件接收機中捕獲、跟蹤的相關算法進行了研究。首先,文章介紹了構(gòu)成GPS系統(tǒng)的各個部分以及它們之間的工作方式；其次就GPS信號的構(gòu)成、調(diào)制方式、信號特性以及信號源設計進行了詳細的闡述,在matlab/simulink平臺上實現(xiàn)各參數(shù)可控的GPS信號源的建模與仿真,以便利用該信號源對捕獲、跟蹤算法進行驗證；然后分析了GPS接收機的基本工作原理,具體剖析了GPS信號的捕獲、跟蹤算法的原理；接著對常用的捕獲和跟蹤的算法進行了研究。提出時域頻率雙并行捕獲算法,該算法在頻移上利用并行頻率搜索法對多普勒頻移進行一次性搜索,在時域上利用多相關器對C/A碼相位偏移進行多點搜索,通過雙并行的方式減少搜索單元的數(shù)量,從而提高搜索捕獲速度；同時,在捕獲判決策略上提出變長-定長聯(lián)合檢測法的捕獲搜索判決策略,該策略以變長時間搜索法為主,固定時間搜索法為輔,在有效節(jié)約搜索時間的同時,避免搜索進入死循環(huán),有效的節(jié)約了特殊情況下的捕獲搜索時間；然后在matlab/simulink平臺上完成算法的建模和仿真,驗證算法的可行性和可靠性；最后,結(jié)合面向?qū)ο缶幊痰乃枷?使用C++語言實現(xiàn)一個軟件接收機。
[Abstract]:At present, the research of algorithms in GPS(Global Position system receiver is getting more and more attention with the rapid development of GPS. The realization of GPS receiver based on software radio is programmable. Easy to modify, modularization, strong adaptability to algorithm, excellent scalability and other characteristics, it has become a research hotspot in the field of satellite navigation in recent years. As the key technology of software receiver, acquisition, tracking, position Velocity time algorithm and other algorithms are the key technologies. It plays an important role in the performance of the software receiver. Through the research of these key algorithms, it can provide reference and reference for the Beidou navigation receiver which is developed independently in our country. This paper focuses on the acquisition and tracking algorithms in the GPS software receiver. Firstly, this paper introduces the components of the GPS system and how to work between them. Secondly, the structure and modulation of the GPS signal are introduced. The characteristics of the signal and the design of the signal source are described in detail. The modeling and simulation of the GPS signal source with controllable parameters are realized on the matlab/simulink platform, so that the acquisition and tracking algorithm can be verified by the signal source. Then the basic working principle of GPS receiver is analyzed, the principle of GPS signal acquisition and tracking algorithm is analyzed in detail, and then the common algorithms of acquisition and tracking are studied. The algorithm uses parallel frequency search method to search the Doppler frequency shift in time domain, and uses multiple correlators to search the phase shift of C / A code in time domain, and reduces the number of search units by double parallel method. In order to improve the speed of search and acquisition, at the same time, in the acquisition decision strategy, a new strategy of variable length and fixed length joint detection is proposed, which is mainly based on the variable time search method, supplemented by the fixed time search method. At the same time to save the search time effectively, avoid the search into a dead cycle, effectively save the acquisition search time under special circumstances; then complete the algorithm modeling and simulation on the matlab/simulink platform, verify the feasibility and reliability of the algorithm; finally, Combined with the idea of object-oriented programming, C language is used to implement a software receiver.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4

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本文編號：1697017