基于FMCW的周界检测雷达关键技术研究
发布时间：2018-12-27 19:39
【摘要】：随着社会的发展,人们对周界检测的需求日益强烈。周界检测雷达因其可以广泛应用于反恐、岛礁防卫、机场监视等诸多领域而受到高度重视。本文纵观国内外研究动态,确定调频连续波(FMCW)的工作体制。根据周界检测雷达的实际特点设计了一种独立本振的雷达系统结构。在此基础上研究了周界检测雷达杂波背景下的慢速入侵目标检测算法。针对该算法存在盲速的不足,提出了一种周界入侵目标综合检测算法实现大动态速度范围入侵目标检测。设计周界检测雷达算法验证样机,从实际的角度对综合检测算法进行验证。主要工作包括:1.从接收机匹配滤波器输出的角度推导线性调频连续波(LFMCW)雷达信号归一化模糊函数,分析其固有的目标分辨率。设计独立本振的雷达系统结构,研究该结构下的信号处理技术,从信号处理的角度解释LFMCW信号存在的“距离-多普勒”耦合现象,最终确定对称三角线性调频连续波(ST-LFMCW)的发射波形。2.针对杂波背景下的慢速入侵目标检测问题,建立多周期ST-LFMCW雷达中频回波信号模型,结合运动目标显示(MTI)与二维快速傅里叶变换(2D-FFT)技术研究了周界检测雷达的慢速入侵目标检测算法。从目标分辨率、积累增益、信杂比改善、最小可检测速度以及盲速的角度分析算法的性能。通过计算机仿真验证了算法的效果,为系统参数设计提供依据。3.针对周界检测雷达MTI+2D-FFT算法存在盲速的不足,研究了频域对消(FDC)算法,以此为基础提出了综合入侵检测算法,在实现慢速入侵目标检测的同时克服MTI算法的盲速问题,实现大动态速度范围入侵目标检测。从目标分辨率、积累增益、信杂比改善以及速度检测范围的角度对算法进行性能分析,并利用计算机仿真验证了算法的效果。4.研制周界检测雷达算法验证样机。依据仿真的参数进行总体方案的规划,着重设计了雷达核心控制器的时序逻辑并进行了仿真验证。开展外场实验,从实际的角度验证了周界检测雷达综合入侵检测算法大动态速度范围入侵目标检测的有效性。
[Abstract]:With the development of society, the demand for perimeter detection is increasingly strong. Perimeter detection radar has been widely used in anti-terrorism, reef defense, airport surveillance and many other fields. In this paper, the research trends at home and abroad are reviewed, and the working system of FM CW (FMCW) is determined. According to the practical characteristics of perimeter detection radar, an independent local oscillator radar system structure is designed. On the basis of this, the detection algorithm of slow intrusion target in the background of perimeter detection radar clutter is studied. In order to solve the problem of blind speed, a comprehensive detection algorithm of perimeter intrusion target is proposed to detect large dynamic velocity target in large dynamic range. The algorithm verification prototype of perimeter detection radar is designed, and the synthetic detection algorithm is verified from the practical point of view. The main work includes: 1. From the point of view of the output of receiver matched filter, the normalized ambiguity function of linear frequency modulated continuous wave (LFMCW) radar signal is derived, and its inherent target resolution is analyzed. The radar system structure of independent local oscillator is designed, the signal processing technology under this structure is studied, and the "range-Doppler" coupling phenomenon of LFMCW signal is explained from the point of view of signal processing. Finally, the transmitting waveform of symmetric triangular linear frequency modulated continuous wave (ST-LFMCW) is determined. 2. Aiming at the problem of slow intrusion target detection in clutter background, a multi-period ST-LFMCW radar intermediate frequency echo signal model is established. Combined with moving target display (MTI) and two-dimensional fast Fourier transform (2D-FFT) technology, the slow intrusion target detection algorithm of perimeter detection radar is studied. The performance of the algorithm is analyzed from the angle of target resolution, cumulative gain, improved signal-to-clutter ratio, minimum detectable speed and blind velocity. The effect of the algorithm is verified by computer simulation, which provides the basis for the design of system parameters. 3. Aiming at the shortage of blind speed in MTI 2D-FFT algorithm of perimeter detection radar, the frequency domain canceling (FDC) algorithm is studied. Based on this, a comprehensive intrusion detection algorithm is proposed, which can overcome the blind speed problem of MTI algorithm while realizing slow speed target detection. The large dynamic velocity range intrusion target detection is realized. The performance of the algorithm is analyzed from the point of view of target resolution, accumulated gain, improved signal-to-clutter ratio and speed detection range, and the effect of the algorithm is verified by computer simulation. The algorithm verification prototype of perimeter detection radar is developed. According to the parameters of the simulation, the overall scheme planning is carried out, and the timing logic of the radar core controller is designed and verified by simulation. The outfield experiments are carried out to verify the effectiveness of the synthetic intrusion detection algorithm for perimeter detection radar in large dynamic velocity range.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN95
本文编号：2393510
[Abstract]:With the development of society, the demand for perimeter detection is increasingly strong. Perimeter detection radar has been widely used in anti-terrorism, reef defense, airport surveillance and many other fields. In this paper, the research trends at home and abroad are reviewed, and the working system of FM CW (FMCW) is determined. According to the practical characteristics of perimeter detection radar, an independent local oscillator radar system structure is designed. On the basis of this, the detection algorithm of slow intrusion target in the background of perimeter detection radar clutter is studied. In order to solve the problem of blind speed, a comprehensive detection algorithm of perimeter intrusion target is proposed to detect large dynamic velocity target in large dynamic range. The algorithm verification prototype of perimeter detection radar is designed, and the synthetic detection algorithm is verified from the practical point of view. The main work includes: 1. From the point of view of the output of receiver matched filter, the normalized ambiguity function of linear frequency modulated continuous wave (LFMCW) radar signal is derived, and its inherent target resolution is analyzed. The radar system structure of independent local oscillator is designed, the signal processing technology under this structure is studied, and the "range-Doppler" coupling phenomenon of LFMCW signal is explained from the point of view of signal processing. Finally, the transmitting waveform of symmetric triangular linear frequency modulated continuous wave (ST-LFMCW) is determined. 2. Aiming at the problem of slow intrusion target detection in clutter background, a multi-period ST-LFMCW radar intermediate frequency echo signal model is established. Combined with moving target display (MTI) and two-dimensional fast Fourier transform (2D-FFT) technology, the slow intrusion target detection algorithm of perimeter detection radar is studied. The performance of the algorithm is analyzed from the angle of target resolution, cumulative gain, improved signal-to-clutter ratio, minimum detectable speed and blind velocity. The effect of the algorithm is verified by computer simulation, which provides the basis for the design of system parameters. 3. Aiming at the shortage of blind speed in MTI 2D-FFT algorithm of perimeter detection radar, the frequency domain canceling (FDC) algorithm is studied. Based on this, a comprehensive intrusion detection algorithm is proposed, which can overcome the blind speed problem of MTI algorithm while realizing slow speed target detection. The large dynamic velocity range intrusion target detection is realized. The performance of the algorithm is analyzed from the point of view of target resolution, accumulated gain, improved signal-to-clutter ratio and speed detection range, and the effect of the algorithm is verified by computer simulation. The algorithm verification prototype of perimeter detection radar is developed. According to the parameters of the simulation, the overall scheme planning is carried out, and the timing logic of the radar core controller is designed and verified by simulation. The outfield experiments are carried out to verify the effectiveness of the synthetic intrusion detection algorithm for perimeter detection radar in large dynamic velocity range.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN95
【参考文献】
相关期刊论文 前9条
1 缪圣凯;;浅谈周界报警市场现状及发展趋势[J];中国安防;2014年17期
2 王月鹏,赵国庆;二维FFT算法在LFMCW雷达信号处理中的应用及其性能分析[J];电子科技;2005年05期
3 杜川华,龚耀寰;LFMCW雷达的距离/多普勒处理[J];电子科技大学学报;2004年01期
4 杨建宇,凌太兵,贺峻;LFMCW雷达运动目标检测与距离速度去耦合[J];电子与信息学报;2004年02期
5 张尉,宁永安;X频段在地面警戒雷达中的应用特性[J];火力与指挥控制;2003年05期
6 杨建宇;LFMCW雷达信号模糊函数分析[J];信号处理;2002年01期
7 张立志,汪学刚,向敬成;线形调频连续波雷达的动目标显示[J];信号处理;2000年03期
8 陈祝明，丁义元，向敬成;线性调频连续波雷达的噪声性能分析[J];电子科技大学学报;1999年01期
9 刘国岁，，孙光民，顾红，朱晓华;连续波雷达及其信号处理技术[J];现代雷达;1995年06期
相关博士学位论文 前1条
1 吴礼;近程毫米波LFMCW雷达多目标信号分析与处理方法研究[D];南京理工大学;2008年
相关硕士学位论文 前5条
1 张也;低截获测速雷达技术研究[D];电子科技大学;2015年
2 孙作亮;基于步进频率的安防雷达设计[D];电子科技大学;2013年
3 曾海涛;基于LFMICW雷达的入侵检测技术研究[D];电子科技大学;2012年
4 林伟;LFMCW警戒雷达信号处理算法分析及硬件设计[D];西安电子科技大学;2012年
5 罗茂麒;近程警戒雷达信号处理设计与实现[D];电子科技大学;2010年
本文编号：2393510
本文链接：https://www.wllwen.com/kejilunwen/xinxigongchenglunwen/2393510.html
