【摘要】：MIMO(Multi-input Multi-output)雷達(dá)是一種將多輸入多輸出通信技術(shù)與雷達(dá)技術(shù)相結(jié)合的新型雷達(dá),它通過同時(shí)發(fā)射多個(gè)相互正交的波形,在接收端進(jìn)行匹配濾波以及多波束形成完成對整個(gè)空間的觀測。機(jī)載雷達(dá)有利于檢測地面目標(biāo),而利用了MIMO雷達(dá)技術(shù)的機(jī)載雷達(dá)對于地面動目標(biāo)有著更好的檢測結(jié)果。本文在對機(jī)載MIMO雷達(dá)特點(diǎn)分析的基礎(chǔ)上,深入研究了機(jī)載MIMO雷達(dá)發(fā)射波形設(shè)計(jì)及動目標(biāo)檢測技術(shù),提出了相應(yīng)的波形設(shè)計(jì)方法,并通過動目標(biāo)檢測技術(shù)分析了該波形的檢測性能。本文的主要工作如下:1.針對Hybrid-LFM信號調(diào)頻斜率僅包含正值的不足,提出了MMFS信號的模型,該波形擁有更大的斜率變化范圍。2.針對機(jī)載MIMO雷達(dá)波形設(shè)計(jì)中所需要考慮的正交性以及多普勒容忍性的問題,提出了優(yōu)化MMFS信號的遺傳算法,使得優(yōu)化后的MMFS信號相比Hybrid-LFM信號擁有更好的正交性、更低的自相關(guān)旁瓣峰值以及更低的多普勒敏感性。3.研究了機(jī)載MIMO雷達(dá)雜波建模方法和信號處理流程,給出了整個(gè)處理流程的數(shù)學(xué)公式。結(jié)合機(jī)載MIMO雷達(dá)系統(tǒng)的特點(diǎn),對回波進(jìn)行MTD處理,分析了MIMO雷達(dá)使用MMFS信號時(shí)的動目標(biāo)檢測性能。4.構(gòu)建了機(jī)載MIMO雷達(dá)的仿真系統(tǒng),實(shí)現(xiàn)了發(fā)射波形生成,雜波環(huán)境模擬以及動目標(biāo)檢測三個(gè)方面的功能。給出了系統(tǒng)實(shí)現(xiàn)框圖,GUI界面布局,數(shù)據(jù)處理流程。最后,通過仿真驗(yàn)證了MMFS波形在正交性和多普勒容忍性方面的優(yōu)勢以及在機(jī)載MIMO雷達(dá)系統(tǒng)中的適應(yīng)性。
[Abstract]:MIMO (Multi-input Multi-output) radar is a new type of radar, which combines multi-input and multi-output communication technology with radar technology. By simultaneously transmitting multiple orthogonal waveforms, matching filtering and multi-beam forming are carried out at the receiving end to complete the observation of the whole space. Airborne radar is advantageous to ground target detection, while airborne radar using MIMO radar technology has better detection results for ground moving target. Based on the analysis of the characteristics of airborne MIMO radar, the design of airborne MIMO radar transmitting waveform and the detection technology of moving target are studied in this paper, and the corresponding waveform design method is put forward. The detection performance of the waveform is analyzed by moving target detection technology. The main work of this paper is as follows: 1. Aiming at the deficiency that the frequency modulation slope of Hybrid-LFM signal contains only positive value, the model of MMFS signal is proposed. The waveform has a larger slope range. 2. Aiming at the problem of orthogonality and Doppler tolerance in waveform design of airborne MIMO radar, a genetic algorithm for optimizing MMFS signal is proposed, which makes the optimized MMFS signal have better orthogonality than Hybrid-LFM signal. Lower autocorrelation sidelobe peak and lower Doppler sensitivity. 3. The modeling method and signal processing flow of airborne MIMO radar clutter are studied, and the mathematical formulas of the whole processing flow are given. Combined with the characteristics of airborne MIMO radar system, the echo is processed by MTD, and the detection performance of moving target is analyzed when MIMO radar uses MMFS signal. The simulation system of airborne MIMO radar is constructed, which realizes three functions: waveform generation, clutter environment simulation and moving target detection. The system implementation diagram and GUI interface layout and data processing flow are given. Finally, the advantages of MMFS waveform in orthogonality and Doppler tolerance and adaptability in airborne MIMO radar system are verified by simulation.
【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：2234218