基于線陣的MIMO-ISAR二維成像方法
doi: 10.11999/JEIT140529
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61382166)和陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃(2014JM8308)資助課題
Two-dimensional Imaging Using MIMO Radar and ISAR Technique Based on Linear Array
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摘要: 針對(duì)多輸入多輸出逆合成孔徑雷達(dá)(MIMO-ISAR)成像中空-時(shí)陣列非均勻造成的成像數(shù)據(jù)不均勻，該文基于線陣建立了目標(biāo)空-時(shí)回波信號(hào)模型，經(jīng)過(guò)推導(dǎo)，提出一種相同距離單元橫向聚焦的成像方法。該方法首先進(jìn)行距離補(bǔ)償，將空時(shí)分布的距離像對(duì)齊至目標(biāo)初始位置；然后構(gòu)建相位因子，補(bǔ)償非關(guān)心方向運(yùn)動(dòng)引起的相位變化；最后對(duì)相同距離單元數(shù)據(jù)沿橫向相干疊加，實(shí)現(xiàn)橫向聚焦。該算法不受陣列形式的限制，無(wú)需數(shù)據(jù)均勻化處理，而且能夠橫向定標(biāo)，仿真驗(yàn)證了該方法的有效性。
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關(guān)鍵詞:
- 多輸入多輸出逆合成孔徑雷達(dá)成像 /
- 距離補(bǔ)償 /
- 橫向聚焦
Abstract: In view of the uneven imaging data caused by the uneven space-time array in the MIMO-ISAR imaging, the echo signal model of a target is established based on a linear array, an imaging algorithm that focuses on the cross-range direction following range unit is proposed. The range compensation is applied firstly, which can make range profiles that distribute in the space-time domain align at the initial position of target. Then phase changes caused by motion in unconcerned direction are compensated. Finally, the range profiles are focused in the cross-range direction following range unit by coherent addition. The algorithm is not restricted by the structure of the array and the processing of uniformity is not needed. In addition, it can determine the ISAR image scale in the cross-range direction. The simulation results verify the validity of the proposed algorithm. -
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