脉冲多普勒雷达信号处理MATLAB仿真研究

发布时间：2018-03-06 01:36

本文选题：模糊函数　切入点：数字正交采样　出处：《安徽理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：脉冲多普勒(PD)雷达,它利用了多普勒效应原理,既具备脉冲雷达的测距性能,又具备多普勒雷达的测速性能,同时对杂波的抑制能力也比较突出,是一种重要的全相参体制的雷达。雷达信号处理是雷达技术发展的核心内容,它主要包含了以下几个方面的技术内容,如信号选择、正交采样技术、脉冲压缩技术、动目标检测技术和恒虚警检测技术等。雷达信号处理的仿真研究具有灵活、方便、快速、经济等特点,对于雷达技术的研究发展具有重要意义。论文首先分析了脉冲多普勒雷达的距离和速度的检测原理,对PD雷达的模糊函数的含义和性质进行了研究,分析了几种不同信号所对应的模糊函数并分别进行了仿真。以此为据,选择能够获得较高分辨率的波形设计方法。其次,根据雷达的检测性能、分辨率以及测量精度等性能要求,以线性调频(LFM)信号为主进行了研究,主要分析了线性调频信号的特性。模拟目标回波信号,将其加入噪声和杂波形成混合信号并对其进行脉冲压缩、动目标检测以及恒虚警处理。其中,脉冲压缩部分,论文选择采用相关处理器法实现。动目标检测部分,论文选择采用脉冲对消器级联多普勒滤波器组来实现。恒虚警处理部分,论文选择采用单元平均恒虚警检测来实现。最后,论文给出了雷达信号处理系统框图,建立目标函数,对其进行相关处理并进行仿真。对仿真结果进行分析,验证通过以上方法进行处理,能够有效获取目标的距离和速度信息,满足精度要求。
[Abstract]:Pulse Doppler Radar (PDR), which utilizes the principle of Doppler effect, not only has the range performance of pulse radar, but also has the performance of velocity measurement of Doppler radar. At the same time, it has a remarkable ability to suppress clutter. Radar signal processing is the core of radar technology development. It mainly includes the following aspects, such as signal selection, quadrature sampling technology, pulse compression technology, radar signal processing, radar signal processing is the core of radar technology development, it mainly includes the following aspects of the technical content, such as signal selection, quadrature sampling technology, pulse compression technology, Moving target detection technology and CFAR detection technology. The simulation research of radar signal processing has the characteristics of flexibility, convenience, speed, economy, etc. It is of great significance for the research and development of radar technology. Firstly, the detection principle of range and velocity of pulsed Doppler radar is analyzed, and the meaning and properties of ambiguity function of PD radar are studied. The fuzzy functions corresponding to several different signals are analyzed and simulated respectively. Based on this, a waveform design method with high resolution is selected. Secondly, according to the radar detection performance, The performance requirements such as resolution and measurement accuracy are studied in this paper. The characteristics of the LFM signal are analyzed, and the echo signal of the target is simulated. It is added into noise and clutter to form mixed signal and pulse compression, moving target detection and CFAR processing are carried out. In this paper, the pulse canceller cascade Doppler filter bank is chosen to realize. The CFAR processing part, the unit average CFAR detection, is chosen to realize. Finally, the radar signal processing system block diagram is given, and the objective function is established. The simulation results are analyzed to verify that the distance and velocity information of the target can be obtained effectively and the precision requirement can be satisfied by analyzing the simulation results.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN957.51

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