本文選題：安防雷達(dá) + FMCW頻率源��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：調(diào)頻連續(xù)波(FMCW:Frequency Modulation Continuous Wave)雷達(dá)具有低發(fā)射功率、結(jié)構(gòu)緊湊、高測(cè)距測(cè)相精度以及高抗有源干擾能力等優(yōu)點(diǎn),因此廣泛應(yīng)用于各種民用、軍工領(lǐng)域。如何產(chǎn)生分高辨率、高線性度、高變頻速度、低功耗的頻率源,是當(dāng)前頻率合成技術(shù)的發(fā)展方向。本文主要工作內(nèi)容如下:1.總結(jié)近年來FMCW雷達(dá)系統(tǒng)的國(guó)內(nèi)外研究現(xiàn)狀,分析FMCW雷達(dá)的硬件組成及測(cè)距測(cè)速信號(hào)處理原理。結(jié)合“Ka波段安防雷達(dá)系統(tǒng)”原理框圖,闡述安防雷達(dá)整機(jī)的工作方式。根據(jù)FMCW雷達(dá)整機(jī)系統(tǒng)指標(biāo),反推出頻率源的指標(biāo),研發(fā)安防雷達(dá)系統(tǒng)中的FMCW頻率源。根據(jù)頻率源的指標(biāo)要求,結(jié)合目前最為成熟的兩種頻率合成技術(shù),直接數(shù)字頻率合成(DDS:Direct Digital Synthesis)和鎖相環(huán)(PLL:Phase Lock Loop),本文最終選擇使用“DDS與PLL兩次混頻結(jié)構(gòu)”作為頻率源設(shè)計(jì)的核心方案,研制一款X波段頻率源。2.設(shè)計(jì)和測(cè)試頻率源中各芯片模塊的電路,主要包括了三個(gè)方面:(1)研發(fā)了一款基于HMC821和一款基于HMC834的鎖相環(huán)電路,并分別對(duì)這兩款鎖相環(huán)電路進(jìn)行了調(diào)試,計(jì)算頻率控制字,將其編寫成程序并寫入到相應(yīng)的寄存器。結(jié)合芯片基本工作原理,詳細(xì)分析調(diào)試中所遇到的問題。對(duì)鎖相環(huán)輸出信號(hào)需要進(jìn)行濾波處理,使其滿足系統(tǒng)指標(biāo)的要求。(2)研發(fā)了一款基于AD9910輸出信號(hào)為調(diào)頻連續(xù)波的DDS電路,詳細(xì)計(jì)算頻率控制字,設(shè)計(jì)芯片合理的外圍供電和控制電路,并對(duì)其進(jìn)行調(diào)試。選擇合適的放大器芯片,設(shè)計(jì)合理的放大器外圍供電、去耦濾波電路。(3)根據(jù)濾波器的指標(biāo)和參數(shù)選擇合適的濾波器,并將其應(yīng)用于頻率源電路中進(jìn)行濾波。根據(jù)濾波器的理論和設(shè)計(jì)方法,設(shè)計(jì)一款多模階梯阻抗諧振器(SIR:Step Impedance Resonator)的X波段微帶濾波器,并對(duì)其進(jìn)行測(cè)試,分析測(cè)試結(jié)果。3.在安防雷達(dá)系統(tǒng)各個(gè)功能模塊調(diào)試完成之后,把頻率源模塊、射頻收發(fā)機(jī)鏈路模塊、中頻自動(dòng)增益控制模塊、基帶信號(hào)處理模塊、電源模塊進(jìn)行整體裝配并進(jìn)行外場(chǎng)測(cè)試,分析實(shí)驗(yàn)數(shù)據(jù)。對(duì)比室外復(fù)雜環(huán)境和簡(jiǎn)單環(huán)境的條件下雷達(dá)的工作情況。分析各個(gè)模塊的功耗,以及系統(tǒng)的總功耗�？偨Y(jié)本文頻率源的設(shè)計(jì),提出還可以優(yōu)化和研究的方向。
[Abstract]:FMCW: frequency Modulation Continuous Waveradar has the advantages of low transmitting power, compact structure, high ranging precision and high anti-active jamming ability, so it is widely used in various civil and military fields.How to produce frequency source with high resolution, high linearity, high frequency conversion speed and low power consumption is the development direction of frequency synthesis technology.The main work of this paper is as follows: 1.This paper summarizes the research status of FMCW radar system at home and abroad in recent years, analyzes the hardware composition of FMCW radar and the principle of signal processing for ranging and velocimetry.Combined with the principle block diagram of Ka band security radar system, the working mode of security radar whole machine is expounded.According to the index of FMCW radar whole machine system and the index of frequency source, the FMCW frequency source in security radar system is developed.According to the requirements of the frequency source, combined with the two most mature frequency synthesis technologies,Direct Digital Frequency synthesizer (DDS: direct Digital Synthesis) and PLL: phase Lock Loopine (PLL: phase). In this paper, we choose "DDS and PLL double mixing structure" as the core scheme of frequency source design, and develop an X-band frequency source. 2.The circuit of each chip module in the frequency source is designed and tested, including three aspects: 1) A phase locked loop circuit based on HMC821 and a phase locked loop circuit based on HMC834 is developed, and the two phase locked loop circuits are debugged to calculate the frequency control word.Write it into a program and write it to the corresponding register.Combined with the basic working principle of the chip, the problems encountered in debugging are analyzed in detail.The output signal of PLL needs to be filtered to meet the requirements of the system. (2) A DDS circuit based on frequency modulation continuous wave (FM) output signal of AD9910 is developed, and the frequency control word is calculated in detail.The reasonable peripheral power supply and control circuit are designed and debugged.Select the appropriate amplifier chip, design the reasonable amplifier peripheral power supply, decoupling filter circuit. Choose the appropriate filter according to the filter index and parameters, and apply it to the frequency source circuit to filter.According to the theory and design method of the filter, an X-band microstrip filter of Sir: step Impedance Resonator is designed and tested, and the test results are analyzed.After debugging each function module of the security radar system, the frequency source module, RF transceiver link module, if automatic gain control module, baseband signal processing module and power supply module are assembled and tested.Analyze the experimental data.The performance of radar in complex outdoor environment is compared with that in simple environment.The power consumption of each module and the total power consumption of the system are analyzed.The design of frequency source in this paper is summarized, and the direction of optimization and research is put forward.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN959

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本文編號(hào)：1754148