發(fā)布時間：2018-12-27 19:39

【摘要】：隨著社會的發(fā)展,人們對周界檢測的需求日益強(qiáng)烈。周界檢測雷達(dá)因其可以廣泛應(yīng)用于反恐、島礁防衛(wèi)、機(jī)場監(jiān)視等諸多領(lǐng)域而受到高度重視。本文縱觀國內(nèi)外研究動態(tài),確定調(diào)頻連續(xù)波(FMCW)的工作體制。根據(jù)周界檢測雷達(dá)的實(shí)際特點(diǎn)設(shè)計了一種獨(dú)立本振的雷達(dá)系統(tǒng)結(jié)構(gòu)。在此基礎(chǔ)上研究了周界檢測雷達(dá)雜波背景下的慢速入侵目標(biāo)檢測算法。針對該算法存在盲速的不足,提出了一種周界入侵目標(biāo)綜合檢測算法實(shí)現(xiàn)大動態(tài)速度范圍入侵目標(biāo)檢測。設(shè)計周界檢測雷達(dá)算法驗(yàn)證樣機(jī),從實(shí)際的角度對綜合檢測算法進(jìn)行驗(yàn)證。主要工作包括:1.從接收機(jī)匹配濾波器輸出的角度推導(dǎo)線性調(diào)頻連續(xù)波(LFMCW)雷達(dá)信號歸一化模糊函數(shù),分析其固有的目標(biāo)分辨率。設(shè)計獨(dú)立本振的雷達(dá)系統(tǒng)結(jié)構(gòu),研究該結(jié)構(gòu)下的信號處理技術(shù),從信號處理的角度解釋LFMCW信號存在的“距離-多普勒”耦合現(xiàn)象,最終確定對稱三角線性調(diào)頻連續(xù)波(ST-LFMCW)的發(fā)射波形。2.針對雜波背景下的慢速入侵目標(biāo)檢測問題,建立多周期ST-LFMCW雷達(dá)中頻回波信號模型,結(jié)合運(yùn)動目標(biāo)顯示(MTI)與二維快速傅里葉變換(2D-FFT)技術(shù)研究了周界檢測雷達(dá)的慢速入侵目標(biāo)檢測算法。從目標(biāo)分辨率、積累增益、信雜比改善、最小可檢測速度以及盲速的角度分析算法的性能。通過計算機(jī)仿真驗(yàn)證了算法的效果,為系統(tǒng)參數(shù)設(shè)計提供依據(jù)。3.針對周界檢測雷達(dá)MTI+2D-FFT算法存在盲速的不足,研究了頻域?qū)ο?FDC)算法,以此為基礎(chǔ)提出了綜合入侵檢測算法,在實(shí)現(xiàn)慢速入侵目標(biāo)檢測的同時克服MTI算法的盲速問題,實(shí)現(xiàn)大動態(tài)速度范圍入侵目標(biāo)檢測。從目標(biāo)分辨率、積累增益、信雜比改善以及速度檢測范圍的角度對算法進(jìn)行性能分析,并利用計算機(jī)仿真驗(yàn)證了算法的效果。4.研制周界檢測雷達(dá)算法驗(yàn)證樣機(jī)。依據(jù)仿真的參數(shù)進(jìn)行總體方案的規(guī)劃,著重設(shè)計了雷達(dá)核心控制器的時序邏輯并進(jìn)行了仿真驗(yàn)證。開展外場實(shí)驗(yàn),從實(shí)際的角度驗(yàn)證了周界檢測雷達(dá)綜合入侵檢測算法大動態(tài)速度范圍入侵目標(biāo)檢測的有效性。
[Abstract]:With the development of society, the demand for perimeter detection is increasingly strong. Perimeter detection radar has been widely used in anti-terrorism, reef defense, airport surveillance and many other fields. In this paper, the research trends at home and abroad are reviewed, and the working system of FM CW (FMCW) is determined. According to the practical characteristics of perimeter detection radar, an independent local oscillator radar system structure is designed. On the basis of this, the detection algorithm of slow intrusion target in the background of perimeter detection radar clutter is studied. In order to solve the problem of blind speed, a comprehensive detection algorithm of perimeter intrusion target is proposed to detect large dynamic velocity target in large dynamic range. The algorithm verification prototype of perimeter detection radar is designed, and the synthetic detection algorithm is verified from the practical point of view. The main work includes: 1. From the point of view of the output of receiver matched filter, the normalized ambiguity function of linear frequency modulated continuous wave (LFMCW) radar signal is derived, and its inherent target resolution is analyzed. The radar system structure of independent local oscillator is designed, the signal processing technology under this structure is studied, and the "range-Doppler" coupling phenomenon of LFMCW signal is explained from the point of view of signal processing. Finally, the transmitting waveform of symmetric triangular linear frequency modulated continuous wave (ST-LFMCW) is determined. 2. Aiming at the problem of slow intrusion target detection in clutter background, a multi-period ST-LFMCW radar intermediate frequency echo signal model is established. Combined with moving target display (MTI) and two-dimensional fast Fourier transform (2D-FFT) technology, the slow intrusion target detection algorithm of perimeter detection radar is studied. The performance of the algorithm is analyzed from the angle of target resolution, cumulative gain, improved signal-to-clutter ratio, minimum detectable speed and blind velocity. The effect of the algorithm is verified by computer simulation, which provides the basis for the design of system parameters. 3. Aiming at the shortage of blind speed in MTI 2D-FFT algorithm of perimeter detection radar, the frequency domain canceling (FDC) algorithm is studied. Based on this, a comprehensive intrusion detection algorithm is proposed, which can overcome the blind speed problem of MTI algorithm while realizing slow speed target detection. The large dynamic velocity range intrusion target detection is realized. The performance of the algorithm is analyzed from the point of view of target resolution, accumulated gain, improved signal-to-clutter ratio and speed detection range, and the effect of the algorithm is verified by computer simulation. The algorithm verification prototype of perimeter detection radar is developed. According to the parameters of the simulation, the overall scheme planning is carried out, and the timing logic of the radar core controller is designed and verified by simulation. The outfield experiments are carried out to verify the effectiveness of the synthetic intrusion detection algorithm for perimeter detection radar in large dynamic velocity range.
【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】：TN95

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