【摘要】：北斗系統(tǒng)是我國(guó)自行研制的衛(wèi)星導(dǎo)航定位系統(tǒng),它將衛(wèi)星導(dǎo)航與定位通信集成一體,能夠全天候、全天時(shí)為各類(lèi)用戶(hù)提供高精度、高可靠定位、導(dǎo)航、授時(shí)服務(wù)。北斗MEO/IGSO衛(wèi)星1B頻點(diǎn)1D信號(hào)調(diào)制的NH碼,使信號(hào)每毫秒發(fā)生翻轉(zhuǎn)的幾率大大增加,這給捕獲、跟蹤方案帶來(lái)了一系列的問(wèn)題。本文在深入研究北斗MEO/IGSO衛(wèi)星1B頻點(diǎn)1D信號(hào)組成及捕獲跟蹤原理的基礎(chǔ)上,重點(diǎn)研究C/A碼和載波的捕獲與跟蹤方案。論文的主要工作如下:1.論文研究了擴(kuò)頻信號(hào)的各種捕獲算法,分析了碼并行捕獲算法和基于部分匹配濾波器的PMF-FFT捕獲算法兩種常規(guī)方法,并論證了其對(duì)北斗信號(hào)的局限性。2.設(shè)計(jì)了兩種基于并行碼相位法的C/A碼捕獲算法,針對(duì)載波頻率捕獲精度較低的缺點(diǎn),設(shè)計(jì)了“并行碼相位法粗捕”和“頻率串行細(xì)捕”相結(jié)合的方案,在小幅增加捕獲時(shí)間和計(jì)算量的情況下,將載波頻率捕獲誤差縮小。在MATLAB環(huán)境下的仿真結(jié)果表明,該方法不受NH碼調(diào)制影響,捕獲性能良好;還設(shè)計(jì)了一種基于部分匹配濾波器(PMF)與快速傅里葉變換(FFT)相結(jié)合的改進(jìn)的C/A碼快速捕獲算法,仿真結(jié)果表明,與已有的PMF-FFT算法的仿真結(jié)果進(jìn)行對(duì)比,所設(shè)計(jì)方法捕獲性能提高2dB。3.論文設(shè)計(jì)了北斗信號(hào)的跟蹤環(huán)路,該跟蹤環(huán)路采用的鑒相器和鑒頻器均可克服NH碼調(diào)制帶來(lái)的問(wèn)題。載波跟蹤環(huán)采用二階鎖頻環(huán)與三階鎖相環(huán)的組合環(huán)路,并對(duì)環(huán)路參數(shù)進(jìn)行了詳細(xì)的設(shè)計(jì),仿真結(jié)果表明所設(shè)計(jì)環(huán)路具有良好的跟蹤性能。
[Abstract]:Beidou system is a satellite navigation and positioning system developed by our country. It integrates satellite navigation and positioning and communication, and can provide high precision, high reliability positioning, navigation and time service to all kinds of users all the time. The NH code modulated by 1B frequency 1D signal of Beidou MEO/IGSO satellite greatly increases the probability of signal flipping per millisecond, which brings a series of problems to the scheme of acquisition and tracking. On the basis of deeply studying the 1D signal composition of Beidou MEO/IGSO 1B frequency point and the principle of acquisition and tracking, this paper focuses on the acquisition and tracking scheme of C / A code and carrier. The main work of the thesis is as follows: 1: 1. In this paper, various acquisition algorithms for spread spectrum signals are studied, two conventional methods, code parallel acquisition algorithm and PMF-FFT acquisition algorithm based on partial matched filter, are analyzed, and its limitation to Beidou signal is demonstrated. Two C / A code acquisition algorithms based on parallel code phase method are designed. Aiming at the low accuracy of carrier frequency acquisition, a scheme of "parallel code phase coarse capture" and "frequency serial fine capture" is designed. The carrier frequency acquisition error is reduced when the acquisition time and computation are increased. The simulation results under MATLAB environment show that the method is not affected by NH code modulation and has good capture performance. An improved C / A code fast acquisition algorithm based on the combination of partial matched filter (PMF) and Fast Fourier transform (FFT) is also designed. The simulation results show that compared with the simulation results of the existing PMF-FFT algorithm, the acquisition performance of the proposed method is improved by 2dB.3. The tracking loop of Beidou signal is designed in this paper. The phase discriminator and frequency discriminator used in the tracking loop can overcome the problems caused by NH code modulation. The carrier tracking loop adopts the combination of second-order frequency locking loop and third-order phase-locked loop, and the loop parameters are designed in detail. The simulation results show that the designed loop has good tracking performance.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN967.1

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本文編號(hào)：2181161