【摘要】：機(jī)載分布式相參射頻探測(cè)系統(tǒng)作為新一代雷達(dá)體制,具有重大的軍事應(yīng)用前景。相比于機(jī)載相控陣?yán)走_(dá),機(jī)載分布式相參射頻探測(cè)系統(tǒng)具有探測(cè)視場(chǎng)寬、分辨率高、自由度高、抗干擾能力強(qiáng)等優(yōu)勢(shì)。然而,正交波形的發(fā)射和布陣結(jié)構(gòu)引起雜波譜特性發(fā)生變化,高自由度增加了雜波處理的樣本需求量和計(jì)算量。本文以機(jī)載分布式相參射頻探測(cè)系統(tǒng)為背景,重點(diǎn)研究機(jī)載分布式相參射頻探測(cè)系統(tǒng)雜波特性及雜波抑制方法。論文研究了機(jī)載分布式相參射頻探測(cè)系統(tǒng)雜波特性。收發(fā)陣列單元分別共線等間距布陣,以發(fā)射頻率正交信號(hào)為例,建立了雜波模型;分別從多普勒頻率維、角度-多普勒頻率維及多普勒頻率-距離維分析了雜波的多普勒特性、空時(shí)特性及時(shí)頻特性。在正側(cè)視陣列情況下,雜波多普勒頻率的變化與距離無(wú)關(guān),但是非正側(cè)視陣列情況,多普勒頻率與角度維成二次曲線關(guān)系且受近距離影響很大;分析了系統(tǒng)參數(shù)如CNR、采樣單元數(shù)和載頻步進(jìn)頻率對(duì)雜波特征譜的影響,及誤差如多普勒模糊、載機(jī)偏航和雜波擾動(dòng)對(duì)雜波特征譜和功率譜的影響。誤差導(dǎo)致雜波去相關(guān),使得雜波功率譜展寬、雜波自由度增大。進(jìn)一步提出了空時(shí)多通道降維雜波抑制方法。通過(guò)分析現(xiàn)有的雜波抑制方法,并比較處理器性能,提出了降低運(yùn)算量的空時(shí)多通道處理方法。將發(fā)射陣列-接收陣列-時(shí)間3維的處理變?yōu)楹铣申嚵?時(shí)間2維的處理,經(jīng)FFT后選擇若干個(gè)相鄰的波束通道和多普勒通道進(jìn)行空時(shí)聯(lián)合處理。仿真結(jié)果表明,該方法在低雜噪比環(huán)境下,不但能獲得同EFA方法和3DJDL方法相同的處理效果,而且具有更低的計(jì)算量和樣本需求量。最后從雜波改善因子、剩余雜波功率、計(jì)算量和樣本需求量幾個(gè)方面比較了不同雜波處理方法的性能。
[Abstract]:As a new generation radar system, airborne distributed coherent radio frequency detection system has a great prospect of military application. Compared with the airborne phased array radar, the airborne distributed radio-frequency detection system has the advantages of wide field of view, high resolution, high degree of freedom and strong anti-jamming ability. However, the transmission of orthogonal waveforms and the structure of arrays cause changes in the spectral characteristics of clutter, and the high degree of freedom increases the demand for samples and the amount of computation for clutter processing. In this paper, the clutter characteristics and clutter suppression methods of airborne distributed coherent radiofrequency detection system are studied with emphasis on the background of airborne distributed coherent radio frequency detection system. The clutter characteristics of airborne distributed coherent radio frequency detection system are studied in this paper. The clutter model is established by collinear equidistant array of transceiver array units, and the Doppler characteristics of the clutter are analyzed from Doppler frequency dimension, angle Doppler frequency dimension and Doppler frequency range dimension, respectively, taking the transmitted frequency orthogonal signal as an example, and analyzing the Doppler characteristics of the clutter from the Doppler frequency dimension, the angle Doppler frequency dimension and the Doppler frequency range dimension, respectively. Space-time characteristic-time-frequency characteristic. In the case of positive side-looking array, the Doppler frequency of clutter is independent of distance, but in the case of non-positive side-looking array, the relationship between Doppler frequency and angle dimension is conic and is greatly affected by the close-range. The effects of system parameters such as CNR, the number of sampling units and the step frequency of carrier frequency on the characteristic spectrum of clutter, as well as the effects of errors such as Doppler blur, carrier yaw and clutter disturbance on the characteristic spectrum and power spectrum of clutter are analyzed. The error causes the clutter to decorrelate and widen the power spectrum of the clutter and increase the degree of freedom of the clutter. Furthermore, a space-time multi-channel reduced-dimensional clutter suppression method is proposed. By analyzing the existing clutter suppression methods and comparing the performance of the processor, a space-time multichannel processing method is proposed to reduce the computational complexity. The processing of transmitting array, receiving array and time 3 D is changed into synthetic array 2 D processing. After FFT, several adjacent beam channels and Doppler channels are selected for space-time joint processing. The simulation results show that the proposed method can not only achieve the same processing effect as EFA and 3DJDL methods, but also have lower computational complexity and sample requirement under low clutter noise ratio environment. Finally, the performance of different clutter processing methods is compared in terms of clutter improvement factor, residual clutter power, calculation amount and sample demand.
【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】：2014
【分類號(hào)】：TN957.51

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