米波MIMO制导雷达信号处理方法研究

发布时间：2018-05-03 15:38

本文选题：米波MIMO制导雷达 + 信号正交性　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：由于结合了米波雷达和MIMO技术各自的优点,米波MIMO制导雷达系统在抗干扰、反隐身、降低雷达截获概率、对抗反辐射导弹等方面具有潜在的优势,在未来雷达中,具有广阔的应用前景。本文主要研究了米波MIMO制导雷达工作在半主动制导模式下,导引头的信号处理方法及相关理论。1.论文介绍米波MIMO制导雷达系统的组成,建立该系统的平面模型与空间模型,研究调频中断连续波(FMICW)的波形特性与参数选择的问题,并论证调频中断连续波的正交性。2.介绍导引头信号处理的相关理论,包括:多速率信号处理、拉伸信号处理、综合脉冲孔径处理、恒虚警检测及单脉冲测角。其中,多速率信号处理降低子阵的采样频率,减少数据率;拉伸信号处理对正交的调频中断连续波进行通道分离与目标距离粗测;综合脉冲孔径处理对目标进行距离精测与角度粗测;恒虚警检测则在存在干扰的背景中检测出感兴趣目标;单脉冲测角在目标粗测角的基础上进行目标角度精测。设计MIMO制导雷达系统中导引头的信号处理流程:数字中频正交采样、通道分离、目标距离粗测、目标距离精测与角度粗测、恒虚警检测及目标角度精测。并对导引头信号处理流程建立数学模型;对信号处理流程中每一个子模块,给出相应的MATLAB仿真结果。仿真结果表明:各个模块均能完成相应的功能。3.对于目标角度的精测,研究了振幅-和差式单脉冲测角与基于窗函数的数字单脉冲测角这两种单脉冲测角算法在米波MIMO制导雷达中的应用,并比较它们各自的优缺点;探讨雷达工作参数、目标速度与测距误差对这两种单脉冲测角精度的影响,并给出相应的MATLAB仿真结果。仿真结果表明:采用单脉冲测角后,能提高米波MIMO制导雷达的测角精度。根据MATLAB的仿真结果可知,回波信号经过导引头信号处理流程处理后,能得到高精度的目标距离值与角度值。但同时也存在着两个亟待解决的问题:(1)由目标速度引起的多普勒频移会导致目标粗测距离误差偏大;(2)角度相位项与距离相位项相耦合,导致测距误差会引起较大的测角误差。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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