發(fā)布時(shí)間：2018-03-15 05:37

  本文選題：脈沖壓縮　切入點(diǎn)：數(shù)字下變頻　出處：《哈爾濱工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：脈沖壓縮技術(shù)能有效的解決目標(biāo)的探測(cè)距離、距離分辨力和速度分辨力矛盾的問題,而被廣泛的應(yīng)用于現(xiàn)代雷達(dá)信號(hào)處理中。隨著FPGA和CPLD器件的不斷發(fā)展,其數(shù)字信號(hào)處理性能的不斷提升,利用FPGA來實(shí)現(xiàn)雷達(dá)的數(shù)字脈沖壓縮成為一種主流趨勢(shì)。本文首先對(duì)脈沖壓縮系統(tǒng)的發(fā)展及現(xiàn)狀進(jìn)行了分析,介紹了脈沖壓縮系統(tǒng)的相關(guān)原理,其主要包括數(shù)字下變頻技術(shù)、線性調(diào)頻信號(hào)的脈沖壓縮技術(shù)和距離旁瓣的抑制方法;對(duì)于線性調(diào)頻信號(hào)、非線性調(diào)頻信號(hào)和相位編碼信號(hào)進(jìn)行了優(yōu)缺點(diǎn)對(duì)比,根據(jù)實(shí)際需要選用線性調(diào)頻信號(hào)實(shí)現(xiàn)脈沖壓縮。隨后對(duì)比分析了兩種實(shí)現(xiàn)數(shù)字脈沖壓縮的方法,選用頻域的脈沖壓縮方案實(shí)現(xiàn)脈沖壓縮系統(tǒng),通過理論分析選定合適的線性調(diào)頻信號(hào)參數(shù),采用MATLAB仿真軟件進(jìn)行了系統(tǒng)仿真驗(yàn)證,并分析了噪聲對(duì)脈壓系統(tǒng)的影響。對(duì)于硬件實(shí)現(xiàn)部分,采用結(jié)構(gòu)化的設(shè)計(jì)思想對(duì)脈壓系統(tǒng)進(jìn)行功能模塊的劃分,通過調(diào)用FPGA IP core和VHDL語言編程設(shè)計(jì)模塊的方法實(shí)現(xiàn)脈沖壓縮系統(tǒng),對(duì)于硬件實(shí)現(xiàn)系統(tǒng)的方案進(jìn)行了詳細(xì)的介紹。最后通過MATLAB與Quartus Ⅱ聯(lián)合仿真的方法對(duì)系統(tǒng)進(jìn)行了功能測(cè)試。本文設(shè)計(jì)的數(shù)字脈沖壓縮系統(tǒng)已經(jīng)在EP2S60 ( EP2S60F672C5ES )平臺(tái)上獲得實(shí)現(xiàn),通過實(shí)驗(yàn)測(cè)試,實(shí)際脈壓系統(tǒng)的脈壓結(jié)果良好,性能指標(biāo)達(dá)到了設(shè)計(jì)要求。
[Abstract]:Pulse compression technology can effectively solve the problem of target detection distance, range resolution and velocity resolution, which is widely used in modern radar signal processing. With the development of FPGA and CPLD devices, With the improvement of digital signal processing performance, it has become a mainstream trend to use FPGA to realize the digital pulse compression of radar. Firstly, the development and current situation of pulse compression system are analyzed, and the related principle of pulse compression system is introduced. It mainly includes digital down-conversion technology, pulse compression technology of linear frequency modulation signal and suppression method of range sidelobe, and compares advantages and disadvantages of linear frequency modulation signal, nonlinear frequency modulation signal and phase coded signal. According to the actual needs, the linear frequency modulation signal is selected to realize pulse compression. Then, two methods to realize digital pulse compression are compared and analyzed. The pulse compression system is realized by using frequency domain pulse compression scheme. Through theoretical analysis, the suitable parameters of LFM signal are selected, the system simulation is verified by MATLAB software, and the influence of noise on pulse compression system is analyzed. The function modules of pulse compression system are divided by structured design idea, and the pulse compression system is realized by calling FPGA IP core and VHDL language programming design module. The hardware implementation scheme of the system is introduced in detail. Finally, the function of the system is tested by the method of MATLAB and Quartus 鈪，

本文編號(hào)：1614684