本文關(guān)鍵詞：衛(wèi)星導(dǎo)航系統(tǒng)中窄帶干擾抑制技術(shù)研究與實(shí)現(xiàn)　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 衛(wèi)星導(dǎo)航 窄帶干擾抑制 時域 頻域

【摘要】：全球?qū)Ш叫l(wèi)星系統(tǒng)(Global Navigation Satellite System,GNSS)通過全天候、不間斷地播發(fā)導(dǎo)航信號,可實(shí)現(xiàn)對目標(biāo)的實(shí)時定位、導(dǎo)航和監(jiān)督管理。GNSS已深入應(yīng)用于生產(chǎn)生活等多個領(lǐng)域。但在復(fù)雜的無線環(huán)境中,經(jīng)過長距離地傳輸,衛(wèi)星導(dǎo)航信號到達(dá)地面時已經(jīng)很微弱。同時,導(dǎo)航信號還受到多種有意和無意的干擾,嚴(yán)重時使得接收機(jī)無法正常工作。窄帶干擾就是一種常見的干擾。因此,需在接收機(jī)中加入窄帶干擾抑制模塊,以保證接收機(jī)的正常工作。在單天線接收導(dǎo)航信號的前提下,本文主要對時域和頻域的窄帶干擾抑制技術(shù)進(jìn)行了深入研究,并在此基礎(chǔ)上對時域LMS濾波器和頻域的50%重疊加窗法頻譜濾波器進(jìn)行了實(shí)現(xiàn)。根據(jù)導(dǎo)航信號和窄帶干擾在時域和頻域中的不同特性,本文主要做了以下工作:(1)通過對接收機(jī)面臨干擾種類的分析,對接收的導(dǎo)航信號和窄帶干擾進(jìn)行了建模,并根據(jù)模型對窄帶干擾對接收機(jī)的影響進(jìn)行了詳細(xì)分析。(2)基于預(yù)測估計思想,在時域研究了導(dǎo)航信號的窄帶干擾抑制技術(shù)。詳細(xì)介紹了LMS(Least Mean Square)及其改進(jìn)的變步長濾波器和LS(Least Squares)、LSL(Least Squares lattice)濾波器的基本原理,對各個濾波器的窄帶干擾抑制性能進(jìn)行了仿真對比。(3)介紹了頻域窄帶干擾抑制的基本原理,并對其中涉及模塊的相關(guān)算法進(jìn)行了深入研究。詳細(xì)介紹了導(dǎo)致“頻譜泄露”現(xiàn)象的原因,并闡述了改善頻譜泄露和信號失真的方法--50%重疊加窗法、反加窗法。頻域的干擾抑制模塊可分為干擾檢測和干擾消除兩部分。因此,本文同時詳細(xì)介紹了用于自適應(yīng)計算干擾門限的N-Sigma算法,研究了用于限幅的條件中值濾波器并對其進(jìn)行了改進(jìn)。最后對相關(guān)算法組成的頻域窄帶干擾抑制方案進(jìn)行了仿真比較。(4)根據(jù)仿真結(jié)果,用Verilog從時域和頻域上實(shí)現(xiàn)了窄帶干擾抑制模塊。驗(yàn)證模塊功能后,將模塊加入導(dǎo)航信號的接收系統(tǒng)。然后對加入窄帶干擾模塊前后的系統(tǒng)進(jìn)行測試,給出了測試結(jié)果。
[Abstract]:Global Navigation Satellite System (GNSS), through all-weather and continuous broadcasting of navigation signals, enables real-time location, navigation and supervision of targets. GNSS has been used in many fields, such as production and life. But in a complex wireless environment, through long distance transmission, the satellite navigation signal is very weak when it reaches the ground. At the same time, the navigation signal is also disturbed by a variety of intentional and unintentional, which makes the receiver unable to work properly. Narrowband interference is a common kind of interference. Therefore, the narrowband interference suppression module should be added to the receiver so as to ensure the normal operation of the receiver. Under the premise of single antenna receiving navigation signals, this paper mainly studies the narrow-band interference suppression technology in the time domain and frequency domain. On this basis, we implemented the 50% time overlapped window filter and LMS filter in the frequency domain. According to the different characteristics of the navigation signal and narrowband interference in time domain and in frequency domain, this paper mainly do the following work: (1) through the analysis of the interference type face of the receiver, a model of the navigation signal and narrowband interference received, and according to the model of narrowband interference receiving machine is analyzed in detail. (2) based on the thought of prediction and estimation, the narrowband interference suppression technique of navigation signals is studied in the time domain. The basic principles of LMS (Least Mean Square) and its improved variable step size filter, LS (Least Squares) and LSL (Least Squares lattice) filter are introduced in detail, and the narrow-band interference suppression performance of each filter is simulated and compared. (3) the basic principle of frequency domain narrowband interference suppression is introduced, and the related algorithms involving modules are studied in depth. The cause of the phenomenon of "spectrum leakage" is introduced in detail, and the method of improving the spectrum leakage and signal distortion, --50% overlapping window method and back window method, is expounded. The interference suppression module in frequency domain can be divided into two parts: interference detection and interference cancellation. Therefore, this paper introduces the N-Sigma algorithm for adaptive computation of interference threshold, and studies the conditional median filter used for clipping, and improves it. Finally, the frequency domain narrowband interference suppression scheme, which is composed of the related algorithms, is simulated and compared. (4) according to the simulation results, the narrowband interference suppression module is realized in the time domain and frequency domain by Verilog. After the function of the module is verified, the module is added to the receiving system of the navigation signal. Then the system is tested before and after the narrow band interference module is added, and the test results are given.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN967.1

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