本文選題：米波MIMO制導(dǎo)雷達(dá) + 信號正交性�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：由于結(jié)合了米波雷達(dá)和MIMO技術(shù)各自的優(yōu)點,米波MIMO制導(dǎo)雷達(dá)系統(tǒng)在抗干擾、反隱身、降低雷達(dá)截獲概率、對抗反輻射導(dǎo)彈等方面具有潛在的優(yōu)勢,在未來雷達(dá)中,具有廣闊的應(yīng)用前景。本文主要研究了米波MIMO制導(dǎo)雷達(dá)工作在半主動制導(dǎo)模式下,導(dǎo)引頭的信號處理方法及相關(guān)理論。1.論文介紹米波MIMO制導(dǎo)雷達(dá)系統(tǒng)的組成,建立該系統(tǒng)的平面模型與空間模型,研究調(diào)頻中斷連續(xù)波(FMICW)的波形特性與參數(shù)選擇的問題,并論證調(diào)頻中斷連續(xù)波的正交性。2.介紹導(dǎo)引頭信號處理的相關(guān)理論,包括:多速率信號處理、拉伸信號處理、綜合脈沖孔徑處理、恒虛警檢測及單脈沖測角。其中,多速率信號處理降低子陣的采樣頻率,減少數(shù)據(jù)率;拉伸信號處理對正交的調(diào)頻中斷連續(xù)波進(jìn)行通道分離與目標(biāo)距離粗測;綜合脈沖孔徑處理對目標(biāo)進(jìn)行距離精測與角度粗測;恒虛警檢測則在存在干擾的背景中檢測出感興趣目標(biāo);單脈沖測角在目標(biāo)粗測角的基礎(chǔ)上進(jìn)行目標(biāo)角度精測。設(shè)計MIMO制導(dǎo)雷達(dá)系統(tǒng)中導(dǎo)引頭的信號處理流程:數(shù)字中頻正交采樣、通道分離、目標(biāo)距離粗測、目標(biāo)距離精測與角度粗測、恒虛警檢測及目標(biāo)角度精測。并對導(dǎo)引頭信號處理流程建立數(shù)學(xué)模型;對信號處理流程中每一個子模塊,給出相應(yīng)的MATLAB仿真結(jié)果。仿真結(jié)果表明:各個模塊均能完成相應(yīng)的功能。3.對于目標(biāo)角度的精測,研究了振幅-和差式單脈沖測角與基于窗函數(shù)的數(shù)字單脈沖測角這兩種單脈沖測角算法在米波MIMO制導(dǎo)雷達(dá)中的應(yīng)用,并比較它們各自的優(yōu)缺點;探討雷達(dá)工作參數(shù)、目標(biāo)速度與測距誤差對這兩種單脈沖測角精度的影響,并給出相應(yīng)的MATLAB仿真結(jié)果。仿真結(jié)果表明:采用單脈沖測角后,能提高米波MIMO制導(dǎo)雷達(dá)的測角精度。根據(jù)MATLAB的仿真結(jié)果可知,回波信號經(jīng)過導(dǎo)引頭信號處理流程處理后,能得到高精度的目標(biāo)距離值與角度值。但同時也存在著兩個亟待解決的問題:(1)由目標(biāo)速度引起的多普勒頻移會導(dǎo)致目標(biāo)粗測距離誤差偏大;(2)角度相位項與距離相位項相耦合,導(dǎo)致測距誤差會引起較大的測角誤差。
[Abstract]:Because of combining the advantages of the meter wave radar and the MIMO technology, the meter wave MIMO guidance radar system has potential advantages in the aspects of anti-jamming, anti-stealth, reducing the probability of radar interception and countering the anti-radiation missile. It has broad application prospect. In this paper, the signal processing method and related theory of Meter-wave MIMO guidance radar operating in semi-active guidance mode are studied. This paper introduces the composition of meter wave MIMO guidance radar system, establishes the plane model and space model of the system, studies the waveform characteristics and parameter selection of FM interrupt continuous wave, and proves the orthogonality of FM interrupt continuous wave. This paper introduces the related theories of seeker signal processing, including multi-rate signal processing, stretch signal processing, synthetic pulse aperture processing, constant false alarm rate detection and monopulse angle measurement. The multi-rate signal processing reduces the sampling frequency and the data rate of the subarray, and the stretch signal processing performs channel separation and target distance coarse measurement for the orthogonal frequency modulated interrupted continuous wave. Synthetic pulse aperture processing is used to measure the range and angle of the target, CFAR detection detects the object of interest in the background of interference, and the monopulse angle is measured on the basis of the coarse angle of the target. The signal processing flow of seeker in MIMO guidance radar system is designed: digital if quadrature sampling, channel separation, target range coarse measurement, target range precision measurement and angle coarse measurement, CFAR detection and target angle precision measurement. The mathematical model of the seeker signal processing flow is established, and the corresponding MATLAB simulation results are given for each sub-module in the signal processing process. The simulation results show that each module can complete the corresponding function. 3. For the precise measurement of target angle, the application of amplitude-sum differential monopulse angle measurement and digital monopulse angle measurement based on window function in Meter-wave MIMO guidance radar is studied, and their respective advantages and disadvantages are compared. The effects of radar operating parameters, target velocity and ranging error on the angle measurement accuracy of these two monopulse are discussed, and the corresponding MATLAB simulation results are given. The simulation results show that the angle measurement accuracy of the meter wave MIMO guidance radar can be improved by using monopulse angle measurement. According to the simulation results of MATLAB, the echo signal can be processed by the seeker signal processing process, and the target distance and angle value can be obtained with high accuracy. But at the same time, there are two urgent problems to be solved: 1) the Doppler frequency shift caused by the target velocity will lead to the coupling of the angle phase term with the range phase term, which will lead to the large angle error caused by the ranging error.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN957.51

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相關(guān)博士學(xué)位論文 前1條

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本文編號：1839077