Forward-Looking Planar Array 3D-STAP using Space Time Illumination Patterns (STIP)
Forward-Looking Planar Array 3D-STAP using Space Time Illumination Patterns (STIP)
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DOI：
10.1109/sam.2006.1706205
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发表时间：
2006-07
期刊：
影响因子：
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通讯作者：
P. Corbell;M. Temple;T. D. Hale
中科院分区：
文献类型：
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作者：
P. Corbell;M. Temple;T. D. Hale
城市作战需要近距离感知，地面移动目标指示（GMTI）可以通过安装在小型高度可拆卸机载平台上的前向或后向多功能阵列雷达提供。然而，机载雷达阵列的任何方向以外的侧视导致海拔依赖的角度多普勒关系的杂波返回。这种非平稳性在感兴趣场景上方存在高度多样性的近距离感测几何结构中是严重的。然而，由于平面阵列能够观察作为仰角函数的杂波统计，因此平面阵列具有优于线性阵列的固有优势。本文通过合成一个单一的3D-STAP滤波器，表现出一个仰角依赖的方位角多普勒响应，这是定制的零杂波“碗”的特点，前视杂波频谱的仰角分集演示的效用。这种能力在发射时尤其可利用，其中所有仰角被同时照射。为了证明潜在的好处，本文提出了使用最近开发的空间时间照明模式（STIP）从平面AESA调用海拔不同的空间时间照明在前视杂波的情况下。结果表明，3D-STIP（方位角-仰角-多普勒）有利于仰角特定的空时波束形成，它消除了杂波能量从一个给定的多普勒频率在所有范围内，潜在地简化了接收处理。使用合成的训练数据和千里眼协方差知识进行模拟，以证明概念验证
Close-in sensing is needed for urban warfare operations, where ground moving target indication (GMTI) could be provided via forward or rear-facing multi-function array radars mounted on small highly-maneuverable airborne platforms. However, airborne radar arrays oriented any direction other than side-looking cause an elevation dependent angle-Doppler relationship in the clutter returns. This non-stationarity is acute in close-in sensing geometries where elevation diversity exists over the scene of interest. However, planar arrays have an inherent advantage over linear arrays due to their ability to observe clutter statistics as a function of elevation. This paper demonstrates the utility of elevation diversity by synthesizing a single 3D-STAP filter that exhibits an elevation dependent azimuth-Doppler response which is tailored to null the clutter "bowl" which characterizes the forward-looking clutter spectrum. Such a capability is particularly exploitable on transmit, where all elevation angles are simultaneously illuminated. To demonstrate potential benefits, this paper proposes the use of recently developed space time illumination patterns (STIP) from a planar AESA to invoke elevation diverse space-time illumination in a forward-looking clutter scenario. It is shown that 3D-STIP (azimuth-elevation-Doppler) facilitates elevation specific space-time beamforming which removes the clutter energy from a given Doppler frequency across all ranges, potentially simplifying processing on receive. Simulations using synthesized training data and clairvoyant covariance knowledge are conducted to demonstrate proof-of-concept