室内非法侵入雷达探测器的研制
发布时间：2018-08-14 12:03
【摘要】：在我国,每年发生的入室犯罪案件达一百多万件,约占全部刑事案件的四分之一,远高于其它类型的刑事案件,严重威胁着公民的人身和财产安全。目前市场上的各种类型室内安防产品很多,但是这些产品由于自身检测技术的限制,普遍存在对低速移动目标检测效果差,以及易受室外干扰,不能对门、窗等易入侵部位进行防护的问题。本文针对现有室内安防产品存在的上述缺陷,介绍了一种采用距离像对消来实现对低速及静止目标的检测方法,并采用距离门选通的方法来消除室外干扰。并且在研究信号处理方法的基础上,研制了一套线性调频连续波(LFMCW)体制的室内非法侵入雷达探测器的原理验证样机,并通过实验验证了信号处理方法的有效性。本文的主要工作有:(1)研究了多种体制连续波雷达的工作原理,及其获得距离像的方法和特点。在此基础上确定了系统的工作体制和波形参数。(2)建立了线性调频连续波信号的目标回波模型,并据此给出了距离像对消、距离门选通的信号处理方法,并使用计算机进行仿真验证。(3)为了验证信号处理方法的实际效果,研制了一套室内非法侵入雷达探测器的原理验证样机。系统采用锯齿波调制的线性调频连续波(LFMCW)体制。目标回波与发射信号耦合的一路本振信号自差拍,得到中频信号。经过滤波放大之后由采集卡进行模数转换,数字中频信号存储在上位机便于后期信号处理。(4)使用室内非法侵入雷达探测器原理验证系统进行了试验。使用得到的试验数据,验证了算法的可行性。
[Abstract]:In China, more than one million crimes occur every year, accounting for 1/4 of the total criminal cases, far higher than other types of criminal cases, seriously threatening the personal and property safety of citizens. At present, there are many kinds of indoor security products in the market. However, due to the limitations of their own detection techniques, these products generally have poor detection effects on low-speed moving targets, and are vulnerable to outdoor interference and cannot be used for doors. Windows and other vulnerable areas for protection. In view of the above defects of the existing indoor security products, this paper introduces a range image cancellation method to detect low speed and static targets, and a range gate gating method to eliminate outdoor interference. Based on the research of signal processing method, a prototype of the indoor trespass radar detector based on linear frequency modulated continuous wave (LFMCW) system is developed, and the validity of the signal processing method is verified by experiments. The main work of this paper is as follows: (1) the principle of continuous wave radar with various systems and the methods and characteristics of obtaining range profile are studied. On the basis of this, the working system and waveform parameters of the system are determined. (2) the target echo model of LFM continuous wave signal is established, and the signal processing method of range cancellation and range gate gating is given. In order to verify the actual effect of the signal processing method, a set of principle verification prototype of indoor trespass radar detector is developed. The linear frequency modulation continuous wave (LFMCW) system is adopted in the system. The homodyne beat of the local oscillator signal coupled with the target echo signal is used to obtain the intermediate frequency signal. After filtering and amplifying, the digital if signal is stored in the upper computer for later signal processing. (4) the principle verification system of indoor trespass radar detector is used to verify the system. The feasibility of the algorithm is verified by using the experimental data obtained.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
本文编号：2182801
[Abstract]:In China, more than one million crimes occur every year, accounting for 1/4 of the total criminal cases, far higher than other types of criminal cases, seriously threatening the personal and property safety of citizens. At present, there are many kinds of indoor security products in the market. However, due to the limitations of their own detection techniques, these products generally have poor detection effects on low-speed moving targets, and are vulnerable to outdoor interference and cannot be used for doors. Windows and other vulnerable areas for protection. In view of the above defects of the existing indoor security products, this paper introduces a range image cancellation method to detect low speed and static targets, and a range gate gating method to eliminate outdoor interference. Based on the research of signal processing method, a prototype of the indoor trespass radar detector based on linear frequency modulated continuous wave (LFMCW) system is developed, and the validity of the signal processing method is verified by experiments. The main work of this paper is as follows: (1) the principle of continuous wave radar with various systems and the methods and characteristics of obtaining range profile are studied. On the basis of this, the working system and waveform parameters of the system are determined. (2) the target echo model of LFM continuous wave signal is established, and the signal processing method of range cancellation and range gate gating is given. In order to verify the actual effect of the signal processing method, a set of principle verification prototype of indoor trespass radar detector is developed. The linear frequency modulation continuous wave (LFMCW) system is adopted in the system. The homodyne beat of the local oscillator signal coupled with the target echo signal is used to obtain the intermediate frequency signal. After filtering and amplifying, the digital if signal is stored in the upper computer for later signal processing. (4) the principle verification system of indoor trespass radar detector is used to verify the system. The feasibility of the algorithm is verified by using the experimental data obtained.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
【参考文献】
相关期刊论文 前1条
1 许果;;基于热释电红外的安防系统设计[J];自动化技术与应用;2010年04期
相关硕士学位论文 前1条
1 周永舜;基于微多普勒的人体探测和特征提取算法研究[D];电子科技大学;2010年
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