【摘要】：在我國,每年發(fā)生的入室犯罪案件達一百多萬件,約占全部刑事案件的四分之一,遠高于其它類型的刑事案件,嚴重威脅著公民的人身和財產(chǎn)安全。目前市場上的各種類型室內(nèi)安防產(chǎn)品很多,但是這些產(chǎn)品由于自身檢測技術(shù)的限制,普遍存在對低速移動目標(biāo)檢測效果差,以及易受室外干擾,不能對門、窗等易入侵部位進行防護的問題。本文針對現(xiàn)有室內(nèi)安防產(chǎn)品存在的上述缺陷,介紹了一種采用距離像對消來實現(xiàn)對低速及靜止目標(biāo)的檢測方法,并采用距離門選通的方法來消除室外干擾。并且在研究信號處理方法的基礎(chǔ)上,研制了一套線性調(diào)頻連續(xù)波(LFMCW)體制的室內(nèi)非法侵入雷達探測器的原理驗證樣機,并通過實驗驗證了信號處理方法的有效性。本文的主要工作有:(1)研究了多種體制連續(xù)波雷達的工作原理,及其獲得距離像的方法和特點。在此基礎(chǔ)上確定了系統(tǒng)的工作體制和波形參數(shù)。(2)建立了線性調(diào)頻連續(xù)波信號的目標(biāo)回波模型,并據(jù)此給出了距離像對消、距離門選通的信號處理方法,并使用計算機進行仿真驗證。(3)為了驗證信號處理方法的實際效果,研制了一套室內(nèi)非法侵入雷達探測器的原理驗證樣機。系統(tǒng)采用鋸齒波調(diào)制的線性調(diào)頻連續(xù)波(LFMCW)體制。目標(biāo)回波與發(fā)射信號耦合的一路本振信號自差拍,得到中頻信號。經(jīng)過濾波放大之后由采集卡進行模數(shù)轉(zhuǎn)換,數(shù)字中頻信號存儲在上位機便于后期信號處理。(4)使用室內(nèi)非法侵入雷達探測器原理驗證系統(tǒng)進行了試驗。使用得到的試驗數(shù)據(jù),驗證了算法的可行性。
[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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN957.51

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本文編號：2182801