本文選題：MIMO雷達(dá) + 雷達(dá)干擾��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：作為一種新興體制的雷達(dá),多輸入多輸出(multiple-input multiple-output,MIMO)雷達(dá)成為雷達(dá)研究領(lǐng)域的熱點(diǎn)之一。目前關(guān)于MIMO雷達(dá)的信號處理研究主要集中在目標(biāo)檢測、參數(shù)估計(jì)、波形設(shè)計(jì)等方面。由于MIMO雷達(dá)出現(xiàn)時(shí)間較晚,關(guān)于其在對抗環(huán)境下的電子反對抗(electronic counter-countermeasures,ECCM)性能的研究目前并不多見。基于此,本文主要研究了集中式MIMO雷達(dá)的ECCM性能,包括抗偵察與抗干擾兩方面,其中對于MIMO雷達(dá)抗干擾的研究集中在空域上,所做的工作主要包括以下幾個(gè)方面。首先,介紹了 MIMO雷達(dá)的信號處理結(jié)構(gòu),包括發(fā)射信號模型和接收信號處理流程。在此基礎(chǔ)上,介紹了常見的雷達(dá)干擾及對抗方法。其次,研究了雷達(dá)信號截獲的原理,針對影響截獲性能的主要因素,即發(fā)射信號的空間功率分布水平,分析了 MIMO雷達(dá)的抗截獲性能。研究了雷達(dá)信號脈內(nèi)調(diào)制類型識別的原理,并針對信號識別過程中特征提取這一關(guān)鍵步驟,研究了MIMO雷達(dá)信號的時(shí)頻特征,進(jìn)而對其抗識別性能進(jìn)行分析。之后,采用空域?yàn)V波,即自適應(yīng)波束形成的方法進(jìn)行MIMO雷達(dá)抗干擾性能研究。從MIMO雷達(dá)接收端信號處理流程入手,分析了其聯(lián)合方向圖的特點(diǎn),包括主瓣寬度、旁瓣高度和自由度優(yōu)勢。對于自適應(yīng)波束形成中的兩個(gè)非理想因素,研究了穩(wěn)健波束形成的相關(guān)算法,將它們移植到MIMO雷達(dá)上。結(jié)合MIMO雷達(dá)聯(lián)合導(dǎo)向矢量的結(jié)構(gòu)特點(diǎn),給出了一種降低時(shí)間復(fù)雜度的穩(wěn)健算法,并進(jìn)行了仿真驗(yàn)證。最后,采用頻率分集陣列(frequency diverse array, FDA)技術(shù)進(jìn)行主瓣干擾抑制研究。普通的波束形成算法在干擾位于主瓣方向時(shí)會影響目標(biāo)信號的接收,造成干擾抑制性能下降。采用了 FDA結(jié)構(gòu)的FDA-MIMO雷達(dá)的聯(lián)合方向圖具有角度-距離二位分辨能力,可以在主瓣方向通過距離維進(jìn)行干擾抑制。此外,針對線性頻率偏移量的FDA方向圖存在距離周期性這一缺陷,本文采用了對數(shù)形式的頻率偏移量進(jìn)行改進(jìn),仿真結(jié)果驗(yàn)證了所提方法的有效性。
[Abstract]:As a new radar system, multiple-input multiple-output MIMO radar has become one of the hotspots in radar research field. At present, the research of MIMO radar signal processing is mainly focused on target detection, parameter estimation, waveform design and so on. Due to the late appearance of MIMO radar, there are few researches on its electronic countermeasures-counter ECCM performance in antagonistic environment. Based on this, this paper mainly studies the ECCM performance of centralized MIMO radar, including anti-reconnaissance and anti-jamming, in which the research of anti-jamming of MIMO radar is focused on the airspace, the work done mainly includes the following aspects. Firstly, the signal processing structure of MIMO radar is introduced, including the transmitting signal model and the receiving signal processing flow. On this basis, the common radar jamming and countermeasures are introduced. Secondly, the principle of radar signal interception is studied, and the anti-interception performance of MIMO radar is analyzed according to the main factors that affect the interception performance, namely, the spatial power distribution level of the transmitted signal. The principle of intrapulse modulation type recognition of radar signal is studied. Aiming at the key step of feature extraction in the process of signal recognition, the time-frequency feature of MIMO radar signal is studied and its anti-recognition performance is analyzed. After that, the anti-jamming performance of MIMO radar is studied by using spatial filtering, that is, adaptive beamforming. Based on the signal processing flow of the MIMO radar receiver, the characteristics of the joint pattern are analyzed, including the width of the main lobe, the height of the sidelobe and the advantages of the degree of freedom. For two non-ideal factors in adaptive beamforming, the correlation algorithms of robust beamforming are studied, and they are transplanted to MIMO radar. A robust algorithm to reduce the time complexity is presented based on the structural characteristics of the joint guidance vector of MIMO radar, and the simulation results are given. Finally, the frequency diversity array frequency diverse array, FDA) technique is used to study the main lobe interference suppression. The conventional beamforming algorithm will affect the receiver of the target signal when the interference is in the direction of the main lobe, resulting in the degradation of interference suppression performance. The joint pattern of FDA-MIMO radar with FDA structure has the ability of angle-range binary resolution, which can suppress the interference in the direction of the main lobe through the range dimension. In addition, the FDA pattern of linear frequency offset has the defect of distance periodicity. In this paper, the logarithmic frequency offset is improved. The simulation results verify the effectiveness of the proposed method.
【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】：2017
【分類號】：TN958

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本文編號：1920149