【摘要】：目前對(duì)雷達(dá)海雜波特性的研究,仍然是以脈沖雷達(dá)回波的歸一化橫截面積的統(tǒng)計(jì)模型為主。雷達(dá)的海雜波是滿足某種概率密度函數(shù)的相關(guān)序列,這體現(xiàn)在它的幅度分布特性和功率譜特性上。而對(duì)線性調(diào)頻連續(xù)波雷達(dá)海雜波的研究很少,相關(guān)的文獻(xiàn)和實(shí)測(cè)數(shù)據(jù)也不多。本文根據(jù)線性調(diào)頻連續(xù)波雷達(dá)的信號(hào)處理理論和脈沖雷達(dá)的海雜波經(jīng)典統(tǒng)計(jì)模型之間的關(guān)系,推導(dǎo)出了線性調(diào)頻連續(xù)波雷達(dá)海雜波的計(jì)算公式。并且仿真出了在典型的海清下,線性調(diào)頻連續(xù)波雷達(dá)海雜波的模型,分析了它的幅度概率密度函數(shù)分布特性和功率譜特性。也仿真出了包含海雜波、噪聲和點(diǎn)目標(biāo)的回波模型,應(yīng)用線性調(diào)頻連續(xù)波雷達(dá)“差拍-FFT”的信號(hào)處理體制,成功提取預(yù)設(shè)目標(biāo)包含距離和速度的信息。本文主要工作概況如下:1.分別分析了鋸齒形和對(duì)稱三角形線性調(diào)頻連續(xù)波雷達(dá)在單掃頻周期和多掃頻周期情況下的動(dòng)目標(biāo)回波,根據(jù)“差拍-FFT”信號(hào)處理體制,介紹了混頻后的差拍信號(hào)及其傅里葉變換后的特性。分析了脈沖雷達(dá)海雜波經(jīng)典統(tǒng)計(jì)模型,應(yīng)用被廣泛認(rèn)可的雜波建模方法仿真出了幾種典型的海雜波模型,仿真出的海雜波與理論值具有很好的吻合性。2.根據(jù)線性調(diào)頻連續(xù)波雷達(dá)與常規(guī)脈沖雷達(dá)的特性,建立出了每個(gè)掃頻周期發(fā)射信號(hào)與每個(gè)發(fā)射脈沖之間的關(guān)系。根據(jù)線性調(diào)頻連續(xù)波雷達(dá)的距離分辨率,將雷達(dá)照射的區(qū)域按徑向距離劃分成若干個(gè)距離單元。從而推導(dǎo)出了線性調(diào)頻連續(xù)波雷達(dá)海雜波的計(jì)算公式。3.根據(jù)推導(dǎo)出的線性調(diào)頻連續(xù)波雷達(dá)海雜波的計(jì)算公式,分析出了線性調(diào)頻連續(xù)波雷達(dá)海雜波距離上的相關(guān)性、幅度分布特性和相關(guān)特性,并且用仿真數(shù)據(jù)驗(yàn)證了分析結(jié)果的正確性。同時(shí),也仿真出了鋸齒形和對(duì)稱三角形線性調(diào)頻連續(xù)波雷達(dá)包含海雜波、噪聲和點(diǎn)目標(biāo)的回波模型。4.對(duì)差拍混頻后的海雜波距離上的相關(guān)性、幅度分布特性和相關(guān)特性進(jìn)行了分析。
[Abstract]:At present, the statistical model of normalized cross section area of pulse radar echo is still used to study the characteristics of radar sea clutter. The sea clutter of radar is a correlation sequence which satisfies a certain probability density function, which is reflected in its amplitude distribution and power spectrum characteristics. However, there are few researches on LFM continuous wave radar sea clutter, and few related literatures and measured data. Based on the relationship between the signal processing theory of linear frequency modulated continuous wave radar and the classical statistical model of sea clutter of pulse radar, a formula for calculating the sea clutter of linear frequency modulated continuous wave radar is derived in this paper. The model of linear frequency modulated continuous wave radar sea clutter under typical sea clear is simulated and its amplitude probability density function distribution characteristic and power spectrum characteristic are analyzed. The echo model including sea clutter, noise and point target is simulated, and the range and velocity information of the preset target is extracted successfully by using the signal processing system of linear frequency modulated continuous wave radar "beat FFT". The main work of this paper is as follows: 1. In this paper, the echo of the moving target in the case of single sweep period and multiple sweep period of zigzag and symmetrical triangular linear frequency modulated continuous wave radar is analyzed, according to the signal processing system of "differential beat FFT", The beat signal after mixing and its characteristics after Fourier transform are introduced. The classical statistical model of pulsed radar sea clutter is analyzed. Several typical sea clutter models are simulated by using the widely accepted clutter modeling method. The simulated sea clutter is in good agreement with the theoretical value. 2. According to the characteristics of linear frequency modulated continuous wave radar and conventional pulse radar, the relationship between each frequency sweeping period transmitting signal and each transmitting pulse is established. According to the range resolution of linear frequency modulated continuous wave radar, the region illuminated by the radar is divided into several range units according to the radial distance. Thus, the formula for calculating the sea clutter of linear frequency modulated continuous wave radar is derived. 3. Based on the deduced formula for calculating the sea clutter of linear frequency modulated continuous wave radar, the correlation, amplitude distribution and correlation characteristics of the range of sea clutter in linear frequency modulated continuous wave radar are analyzed. The correctness of the analysis results is verified by simulation data. At the same time, the echo models of zigzag and symmetric triangular LFM continuous wave radar including sea clutter, noise and point target are also simulated. 4. The correlation, amplitude distribution and correlation characteristics of the sea clutter after subtraction mixing are analyzed.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN957.51

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本文編號(hào)：2270937