發(fā)布時間：2018-07-31 05:03

【摘要】：隨著衛(wèi)星導航在國防、民航管理、農業(yè)、智能交通、科技漁業(yè)以及高鐵監(jiān)控等方面的廣泛應用，世界各國也越來越重視衛(wèi)星導航技術的研究與發(fā)展。我國的北斗導航定位系統(tǒng)在設計之初就肩負著促進國家信息化建設和經(jīng)濟發(fā)展方式轉型的重要使命，滿足我們國家國防，經(jīng)濟和社會發(fā)展的戰(zhàn)略需求。系統(tǒng)在建設過程中也始終按照“堅持效益目標、堅持自主創(chuàng)新、堅持質量至上、堅持科學決策”的原則。根據(jù)“三步走”規(guī)劃，在2012年底，中國“北斗二代”區(qū)域導航系統(tǒng)已經(jīng)宣告建成，服務范圍已經(jīng)可以覆蓋整個中國以及大部分亞洲國家。整個系統(tǒng)預計會在2020年左右宣告建成，到時候將具備向全球大部分國家提供導航定位服務的能力。 本文基于北斗導航接收機研制項目，主要研究接收機的捕獲與跟蹤過程。首先，比較了全球四大全球定位系統(tǒng)的建設現(xiàn)狀以及各自的優(yōu)缺點，并重點對我國北斗衛(wèi)星導航定位系統(tǒng)做了介紹。其次，介紹了衛(wèi)星導航的理論基礎、擴頻通信的基本原理、鎖相環(huán)原理以及導航定位原理，，并在MATLAB仿真環(huán)境產生了捕獲用的本地偽碼和載波信號。最后，重點研究了接收機中基帶信號處理的方法，介紹了常用的捕獲算法和跟蹤環(huán)路的設計方法，通過分析比較，確定了捕獲算法采用改進的滑動相關法，跟蹤環(huán)路設計采用二階FLL輔助三階PLL，通過在MATLAB仿真環(huán)境下對該設計方案進行驗證，實驗結果表明本文捕獲算法與跟蹤算法設計的有效性。
[Abstract]:With the extensive application of satellite navigation in the fields of national defense, civil aviation management, agriculture, intelligent transportation, science and technology fisheries and high speed rail monitoring, the research and development of satellite navigation technology have been paid more and more attention all over the world. The Beidou navigation and positioning system in our country is at the beginning of the design of the national information construction and the transformation of economic development mode. The important mission is to meet the strategic needs of our national defense, economic and social development. In the process of construction, the system has always been in accordance with the principle of "adhering to the goal of efficiency, insisting on independent innovation, insisting on quality first, insisting on scientific decision-making". According to the "three steps" plan, China's "Beidou two generation" regional navigation system has already been established by the end of 2012. The whole system is expected to be completed around 2020 and will have the ability to provide navigation and positioning services to most countries around the world, as the service covers the whole of China and most of the Asian countries.
Based on the development project of the Beidou navigation receiver, this paper mainly studies the acquisition and tracking process of the receiver. Firstly, it compares the construction status of the four global positioning systems in the world and their advantages and disadvantages, and focuses on the introduction of the Beidou satellite navigation and positioning system in China. Secondly, it introduces the theoretical basis of the satellite navigation, and the spread spectrum communication. The basic principle, the principle of phase-locked loop and the principle of navigation and positioning, and the acquisition of local pseudo code and carrier signal in the MATLAB simulation environment. Finally, the method of the baseband signal processing in the receiver is studied, and the common acquisition algorithm and the design method of the tracking loop are introduced. Through the analysis and comparison, the acquisition algorithm is determined to be modified. In the sliding correlation method, the design of the tracking loop is designed by two order FLL auxiliary three order PLL, and the design scheme is verified by the MATLAB simulation environment. The experimental results show the validity of the design of the algorithm and the tracking algorithm.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN965.5

【參考文獻】

相關期刊論文 前2條

1 楊靈;趙笙罡;胡修林;;DSSS滑動相關捕獲算法改進及性能分析[J];電訊技術;2007年01期

2 周平,薛敏彪,胡永紅,陳銘;擴頻數(shù)字接收機匹配濾波器的設計與實現(xiàn)[J];微電子學與計算機;2004年09期

本文編號：2154491