本文選題：多普勒效應(yīng) + 微波探測(cè)��； 參考：《杭州電子科技大學(xué)》2015年碩士論文

【摘要】：設(shè)計(jì)一個(gè)基于多普勒效應(yīng)的小型微波探測(cè)系統(tǒng),可實(shí)現(xiàn)對(duì)移動(dòng)目標(biāo)的實(shí)時(shí)探測(cè)。該系統(tǒng)主要包括微波傳感器、信號(hào)放大濾波電路和單片機(jī)采樣處理電路。微波傳感器發(fā)射10.52G赫茲的高頻微波信號(hào),遇到目標(biāo)障礙物反射回來(lái),將發(fā)射信號(hào)和回波信號(hào)進(jìn)行混頻,輸出一個(gè)頻率較低的中頻信號(hào),即系統(tǒng)預(yù)警信號(hào)。通過(guò)放大電路將毫伏級(jí)中頻信號(hào)放大,利用PIC12F675單片機(jī)對(duì)放大后的信號(hào)進(jìn)行采樣判斷,實(shí)現(xiàn)對(duì)警示燈的開(kāi)關(guān)控制。分析了系統(tǒng)的探測(cè)原理和結(jié)構(gòu)組成,簡(jiǎn)單介紹了該課題的國(guó)內(nèi)外的研究概況,分別從理論、仿真和設(shè)計(jì)等多角度論述系統(tǒng)的制作過(guò)程。探測(cè)傳感器設(shè)計(jì)部分,采用介質(zhì)柱(DR)和高頻FET管組成的介質(zhì)振蕩器為系統(tǒng)提供頻率源,采用電容直接耦合,第一路信號(hào)由發(fā)射天線發(fā)射出去,第二路信號(hào)送往混頻器,混頻器采用U型傳輸線和二極管組成的反相單平衡混頻器,收發(fā)天線分別采用矩形貼片天線單元；信號(hào)放大處理部分,選用集成運(yùn)放芯片LM358設(shè)計(jì)兩級(jí)放大電路,同時(shí)實(shí)現(xiàn)帶通濾波,對(duì)傳感器輸出的中頻信號(hào)進(jìn)行放大,濾除高頻干擾；信號(hào)采樣部分,以PIC12F675單片機(jī)為處理器,將采樣到的信號(hào)電壓與設(shè)定的門限電壓3V進(jìn)行比較,超過(guò)門限電壓表示移動(dòng)物體存在,點(diǎn)亮警示燈。整個(gè)系統(tǒng)制作調(diào)試完成,分別選用不同物體作移動(dòng)目標(biāo),對(duì)整個(gè)探測(cè)系統(tǒng)的徑向最遠(yuǎn)距離和空間探測(cè)范圍進(jìn)行測(cè)試,系統(tǒng)在一定區(qū)域內(nèi)能實(shí)現(xiàn)對(duì)移動(dòng)目標(biāo)的實(shí)時(shí)探測(cè),工作穩(wěn)定可靠。
[Abstract]:A small microwave detection system based on Doppler effect is designed, which can detect moving targets in real time. The system mainly includes microwave sensor, signal amplifying and filtering circuit and single chip microcomputer sampling and processing circuit. The microwave sensor emits 10.52 G Hz high frequency microwave signal. When the target obstacle is reflected back, the transmitting signal and echo signal are mixed, and a low-frequency intermediate frequency signal is output, that is, the early warning signal of the system. The millivolt intermediate frequency signal is amplified by amplifying circuit, and the amplified signal is sampled and judged by PIC12F675 single chip microcomputer, and the switch control of warning lamp is realized. This paper analyzes the detection principle and structure of the system, introduces the research situation of the system at home and abroad, and discusses the manufacture process of the system from the aspects of theory, simulation and design. In the design part of the detection sensor, the dielectric oscillator composed of a dielectric cylinder (DRD) and a high frequency FET tube is used to provide the frequency source for the system. The first signal is transmitted by the transmitting antenna and the second signal is sent to the mixer. The mixer is composed of U-type transmission line and diode, and the transceiver antenna uses rectangular patch antenna unit respectively, and the signal amplification processing part is designed by LM358, the integrated operational amplifier chip is used to design the two-stage amplifier circuit. At the same time, the band-pass filter is realized to amplify the intermediate frequency signal from the sensor and filter out the high frequency interference. In the signal sampling part, the signal voltage is compared with the threshold voltage 3V by using PIC12F675 single chip microcomputer as the processor. Beyond the threshold voltage indicates the presence of a moving object and lights the warning light. The whole system is made and debugged, different objects are selected as moving targets, and the radial longest distance and space detection range of the whole detection system are tested. The system can realize the real-time detection of moving targets in a certain area. The work is stable and reliable.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN015

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本文編號(hào)：1889821