24GHz调频连续波雷达信号处理技术研究

【作者】 李健；

【导师】 车文荃；

【作者基本信息】 南京理工大学 ， 电磁场与微波技术， 2017， 硕士

【摘要】 近年来,随着毫米波器件、电路及天线技术的提升,毫米波雷达的应用也获得了很大的发展。随着我国经济的飞速发展,民用领域对雷达的需求也越来越多。其中,24GHz调频连续波(FMCW)雷达在汽车防撞、自适应巡航控制、交通监管等领域均有广泛的应用,人们对此开展了很多的研究。中频信号处理是整个雷达系统不可或缺的部分,本文针对24GHz调频连续波雷达信号处理方法进行了较为深入的研究。本论文的主要工作包括两个方面,算法的研究和硬件平台的实现,具体如下:1、24GHzFMCW雷达的算法的研究。首先对差拍信号进行了数学建模,详细分析了它的时域和频域特性,给出了目标检测的数学依据;对单目标检测的各个流程如FIR滤波、加窗FFT、恒虚警处理、积累处理等进行了研究,给出了一种能提高频率测量精度的方法;最后,对多目标检测中的不同波形设计进行了研究,针对传统波形中的多目标配对困难的问题,提出了一种改进的波形,仿真结果验证了方案的可行性。2、基于TMS320C6748的硬件平台搭建。以TMS320C6748为核心板来搭建硬件平台,控制采用D/A和A/D模块输出所需要的三角波及对中频信号进行采样,完成基本算法在DSP里的实现。最后,给出实际测试结果,对算法的正确性和可行性进行了验证。更多还原

【Abstract】 With the improvement of millimeter wave devices and antenna technology etc,the millimeter wave radars have had quite big development in recent years.Along with the rapid economic development of China,more and more radars applied in civil fields are demanded,among of them,24GHz frequency modulated continuous wave(FMCW)radar has been widely used in the field of automotive anti-collision,adaptive cruise control,traffic regulation.Many researches have been carried out in this field.This thesis is focused on analyses of signal processing of 24GHz continuous wave radar radar system.The main researches are focused on the research of algorithm and implementation of the hardware platform,as listed in follows:Firstly,the research of algorithm of 24GHz FMCW radar is carried out.The beat signal is modeled by mathematical method and the time domain and frequency domain characteristics are analyzed in detail,which is the mathematical basis for target detection.Furthermore,the flow of a single target detection such as FIR filter,windowed FFT,CFAR processing and accumulation is given,and a method of frequency measurement to improve the precision is presented.Finally,the design of different waveforms in multi-target detection is studied,aiming at solving the problem of multi-target matching,and an improved waveform is proposed,which is proved by the simulation results.Secondly,the hardware platform setup based on TMS320C6748 is constructed,TMS320C6748 is used as the core board to build the hardware platform,which controls the D/A and A/D converter to output the needed triangle wave signal and complete sampling.Finally,the actual test results are given to verify the validity and feasibility of the algorithm.更多还原