MIMO雷達(dá)正交波形設(shè)計(jì)與仿真實(shí)驗(yàn)研究
發(fā)布時(shí)間：2018-08-16 08:05
【摘要】：現(xiàn)代信息化戰(zhàn)爭(zhēng)要求有更高的戰(zhàn)場(chǎng)感知能力,雷達(dá)作為一種全天候、遠(yuǎn)距離、高精度的戰(zhàn)場(chǎng)感知工具,在現(xiàn)代信息化戰(zhàn)爭(zhēng)中發(fā)揮著重要的作用。多輸入多輸出(Multiple-input Multiple-output, MIMO)雷達(dá)以通信領(lǐng)域的MIMO技術(shù)為基礎(chǔ),依靠多天線信號(hào)發(fā)射和多天線接收目標(biāo)反射信號(hào),利用波形分集技術(shù)有效提高雷達(dá)的綜合性能。本文研究MEMO雷達(dá)的正交波形設(shè)計(jì),既是實(shí)現(xiàn)MIMO雷達(dá)的關(guān)鍵問題,也是影響MIMO雷達(dá)最終性能的關(guān)鍵因素。本文完成的主要工作包括：1.研究和分析MIMO雷達(dá)原理和信號(hào)處理方式,推理出MIMO雷達(dá)正交波形的設(shè)計(jì)標(biāo)準(zhǔn),即良好的正交波形特性應(yīng)具有較低的自相關(guān)旁瓣峰值和互相關(guān)峰值。2.應(yīng)用頻分復(fù)用原理設(shè)計(jì)正交頻分復(fù)用線性調(diào)頻信號(hào)(Orthogonal Frequency Division Multiplexing Linear frequency modulation, OFDM-LFM)正交波形,通過對(duì)OFDM-LFM正交波形模糊函數(shù)的分析,研究OFDM-LFM正交波形的自相關(guān)特性和互相關(guān)特性,分析表明OFDM-LFM正交波形具有良好的正交性,較高的分辨率,較大的多普勒容限。3.建立正交多相編碼信號(hào)模型,以最小化自相關(guān)旁瓣峰值和互相關(guān)峰值為目標(biāo)函數(shù),利用遺傳算法設(shè)計(jì)MIMO雷達(dá)正交多相編碼波形,并分析其影響因素。4.分別對(duì)本文提出的MIMO雷達(dá)正交波形進(jìn)行相關(guān)仿真,驗(yàn)證波形設(shè)計(jì)的有效性和可行性。在自相關(guān)特性仿真中,驗(yàn)證正交波形具有較低的自相關(guān)旁瓣峰值,并引入多普勒頻率,比較多普勒效應(yīng)對(duì)自相關(guān)的影響；在互相關(guān)特性仿真中,驗(yàn)證正交波形具有較低的互相關(guān)峰值,變化影響因素值,驗(yàn)證理論分析的正確性。本文圍繞正交波形的設(shè)計(jì)準(zhǔn)則,實(shí)現(xiàn)了OFDM-LFM和基于遺傳算法的正交多相編碼兩種正交波形設(shè)計(jì),仿真實(shí)驗(yàn)表明兩種正交波形的自相關(guān)旁瓣峰值和互相關(guān)峰值均達(dá)到了設(shè)計(jì)要求,OFDM-LFM正交波形適用于搜索雷達(dá),正交多相編碼波形更適用于對(duì)多普勒變化窄、精確度要求非常高的場(chǎng)合,比如低速跟蹤雷達(dá)等。
[Abstract]:Modern information war requires higher battlefield perception ability. Radar, as a kind of all-weather, long-distance and high-precision battlefield sensing tool, plays an important role in modern information war. The Multiple-input Multiple-Output (MIMO) radar is based on the MIMO technology in the field of communication. It relies on the multi-antenna signal transmission and the multi-antenna to receive the target reflection signal. The waveform diversity technique is used to effectively improve the comprehensive performance of the radar. In this paper, the orthogonal waveform design of MEMO radar is not only the key problem to realize MIMO radar, but also the key factor to affect the final performance of MIMO radar. The main work accomplished in this paper includes 1: 1. The principle and signal processing of MIMO radar are studied and analyzed, and the design standard of orthogonal waveform of MIMO radar is deduced, that is, the good characteristic of orthogonal waveform should have lower autocorrelation sidelobe peak and cross-correlation peak value. The orthogonal waveform of orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing Linear frequency modulation, OFDM-LFM) signal is designed by using the principle of frequency division multiplexing. By analyzing the ambiguity function of OFDM-LFM orthogonal waveform, the autocorrelation and cross-correlation characteristics of OFDM-LFM orthogonal waveform are studied. The analysis shows that OFDM-LFM quadrature waveform has good orthogonality, high resolution and large Doppler tolerance. 3. The orthogonal polyphase coded signal model is established. The objective function is to minimize the peak of autocorrelation sidelobe and cross-correlation. The orthogonal polyphase coding waveform of MIMO radar is designed by genetic algorithm, and the influencing factors are analyzed. The orthogonal waveform of MIMO radar presented in this paper is simulated to verify the validity and feasibility of the waveform design. In the autocorrelation simulation, it is verified that the orthogonal waveform has lower autocorrelation sidelobe peak, and Doppler frequency is introduced to compare the influence of Doppler effect on autocorrelation. It is verified that the orthogonal waveform has low cross-correlation peak value and variable factor value, which verifies the correctness of the theoretical analysis. In this paper, OFDM-LFM and orthogonal polyphase coding based on genetic algorithm are designed around the design criteria of orthogonal waveforms. Simulation results show that the autocorrelation sidelobe peak and cross-correlation peak of the two orthogonal waveforms meet the design requirements. The OFDM-LFM orthogonal waveforms are suitable for searching radar, and the orthogonal polyphase coded waveforms are more suitable for narrow Doppler variations. Very high accuracy requirements, such as low-speed tracking radar and so on.
【學(xué)位授予單位】：中國(guó)科學(xué)院大學(xué)(工程管理與信息技術(shù)學(xué)院)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN958
本文編號(hào)：2185399
[Abstract]:Modern information war requires higher battlefield perception ability. Radar, as a kind of all-weather, long-distance and high-precision battlefield sensing tool, plays an important role in modern information war. The Multiple-input Multiple-Output (MIMO) radar is based on the MIMO technology in the field of communication. It relies on the multi-antenna signal transmission and the multi-antenna to receive the target reflection signal. The waveform diversity technique is used to effectively improve the comprehensive performance of the radar. In this paper, the orthogonal waveform design of MEMO radar is not only the key problem to realize MIMO radar, but also the key factor to affect the final performance of MIMO radar. The main work accomplished in this paper includes 1: 1. The principle and signal processing of MIMO radar are studied and analyzed, and the design standard of orthogonal waveform of MIMO radar is deduced, that is, the good characteristic of orthogonal waveform should have lower autocorrelation sidelobe peak and cross-correlation peak value. The orthogonal waveform of orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing Linear frequency modulation, OFDM-LFM) signal is designed by using the principle of frequency division multiplexing. By analyzing the ambiguity function of OFDM-LFM orthogonal waveform, the autocorrelation and cross-correlation characteristics of OFDM-LFM orthogonal waveform are studied. The analysis shows that OFDM-LFM quadrature waveform has good orthogonality, high resolution and large Doppler tolerance. 3. The orthogonal polyphase coded signal model is established. The objective function is to minimize the peak of autocorrelation sidelobe and cross-correlation. The orthogonal polyphase coding waveform of MIMO radar is designed by genetic algorithm, and the influencing factors are analyzed. The orthogonal waveform of MIMO radar presented in this paper is simulated to verify the validity and feasibility of the waveform design. In the autocorrelation simulation, it is verified that the orthogonal waveform has lower autocorrelation sidelobe peak, and Doppler frequency is introduced to compare the influence of Doppler effect on autocorrelation. It is verified that the orthogonal waveform has low cross-correlation peak value and variable factor value, which verifies the correctness of the theoretical analysis. In this paper, OFDM-LFM and orthogonal polyphase coding based on genetic algorithm are designed around the design criteria of orthogonal waveforms. Simulation results show that the autocorrelation sidelobe peak and cross-correlation peak of the two orthogonal waveforms meet the design requirements. The OFDM-LFM orthogonal waveforms are suitable for searching radar, and the orthogonal polyphase coded waveforms are more suitable for narrow Doppler variations. Very high accuracy requirements, such as low-speed tracking radar and so on.
【學(xué)位授予單位】：中國(guó)科學(xué)院大學(xué)(工程管理與信息技術(shù)學(xué)院)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN958
【參考文獻(xiàn)】
相關(guān)博士學(xué)位論文 前1條
1 曾建奎;MIMO雷達(dá)信號(hào)檢測(cè)的若干問題研究[D];電子科技大學(xué);2008年
相關(guān)碩士學(xué)位論文 前1條
1 崔向陽;基于二相編碼信號(hào)的雷達(dá)目標(biāo)檢測(cè)及實(shí)現(xiàn)[D];西安電子科技大學(xué);2010年
，本文編號(hào)：2185399
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