本文選題：米波MIMO制導(dǎo)雷達(dá) + 信號(hào)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(diǎn),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(duì)抗反輻射導(dǎo)彈等方面具有潛在的優(yōu)勢(shì),在未來(lái)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(dòng)制導(dǎo)模式下,導(dǎo)引頭的信號(hào)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(wèn)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(hào)處理的相關(guān)理論,包括:多速率信號(hào)處理、拉伸信號(hào)處理、綜合脈沖孔徑處理、恒虛警檢測(cè)及單脈沖測(cè)角。其中,多速率信號(hào)處理降低子陣的采樣頻率,減少數(shù)據(jù)率;拉伸信號(hào)處理對(duì)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(cè);綜合脈沖孔徑處理對(duì)目標(biāo)進(jìn)行距離精測(cè)與角度粗測(cè);恒虛警檢測(cè)則在存在干擾的背景中檢測(cè)出感興趣目標(biāo);單脈沖測(cè)角在目標(biāo)粗測(cè)角的基礎(chǔ)上進(jìn)行目標(biāo)角度精測(cè)。設(shè)計(jì)MIMO制導(dǎo)雷達(dá)系統(tǒng)中導(dǎo)引頭的信號(hào)處理流程:數(shù)字中頻正交采樣、通道分離、目標(biāo)距離粗測(cè)、目標(biāo)距離精測(cè)與角度粗測(cè)、恒虛警檢測(cè)及目標(biāo)角度精測(cè)。并對(duì)導(dǎo)引頭信號(hào)處理流程建立數(shù)學(xué)模型;對(duì)信號(hào)處理流程中每一個(gè)子模塊,給出相應(yīng)的MATLAB仿真結(jié)果。仿真結(jié)果表明:各個(gè)模塊均能完成相應(yīng)的功能。3.對(duì)于目標(biāo)角度的精測(cè),研究了振幅-和差式單脈沖測(cè)角與基于窗函數(shù)的數(shù)字單脈沖測(cè)角這兩種單脈沖測(cè)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(diǎn);探討雷達(dá)工作參數(shù)、目標(biāo)速度與測(cè)距誤差對(duì)這兩種單脈沖測(cè)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(cè)角后,能提高米波MIMO制導(dǎo)雷達(dá)的測(cè)角精度。根據(jù)MATLAB的仿真結(jié)果可知,回波信號(hào)經(jīng)過(guò)導(dǎo)引頭信號(hào)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(shí)也存在著兩個(gè)亟待解決的問(wèn)題:(1)由目標(biāo)速度引起的多普勒頻移會(huì)導(dǎo)致目標(biāo)粗測(cè)距離誤差偏大;(2)角度相位項(xiàng)與距離相位項(xiàng)相耦合,導(dǎo)致測(cè)距誤差會(huì)引起較大的測(cè)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(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN957.51

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 秦國(guó)棟;微波稀布陣SIAR參數(shù)估計(jì)及相關(guān)技術(shù)研究[D];西安電子科技大學(xué);2009年

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本文編號(hào)：1839077