摘要
与只提供角度依赖天线方向图的相控阵不同,频率分集阵列(FDA)在每个阵元上引入了载频差,以提供距离-角度相关的天线方向图,这使得FDA具有抑制距离模糊杂波、抗距离依赖性干扰等相控阵没有的优点。简要介绍了FDA的基本原理、波束形成和接收处理机制,梳理了FDA的研究进展,主要包括目标位置估计、FDA与MIMO雷达结合抗干扰、在SAR成像中的应用以及机载雷达距离模糊杂波抑制等4个方面,最后分析了FDA雷达在实际应用中所面临的两个关键问题以及应用前景。
Unlike phased arrays which provide only angle-dependent antenna patterns,the frequency diversity array( FDA) employs carrier-frequency differences on each array element to provide range-angle-dependent antenna patterns. Thus,it makes FDA have the advantage to suppress ambiguity clutter,distance-dependent jamming and so on,which phased arrays do not have. A brief introduction of the FDA's fundamentals,beam forming and receive processing architectures are given. And the FDA' s research progress are summarized,including estimating target positions,anti-interference by combining FDA and multiple-input multiple-output( MIMO) radars,synthetic aperture radar( SAR) imaging applications and suppression of ambiguous clutter in airborne radar. Finally,the two key problems that FDA radar faces in practical application and promising applications are analyzed.
引文
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