Virtual Antenna Array Analysis for MIMO Synthetic Aperture Radars
Virtual Antenna Array Analysis for MIMO Synthetic Aperture Radars
复制标题
MIMO 合成孔径雷达的虚拟天线阵列分析
DOI：
10.1155/2012/587276
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发表时间：
2012-01-01
影响因子：
1.5
通讯作者：
Wang, Wen-Qin
中科院分区：
文献类型：
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作者：
Wang, Wen-Qin
多输入多输出（MIMO）合成孔径雷达（SAR）是最近提出的遥感概念，它采用多个天线发射正交波形并使用多个天线接收雷达回波。事实证明，MIMO SAR 可用于提高遥感系统性能。迄今为止，大多数 MIMO SAR 研究都集中在信号/数据模型和相应的信号处理算法上。与 MIMO SAR 天线分析相关的工作很少。 MIMO SAR的主要优点之一是通过虚拟天线阵列的概念可以大大增加自由度。在本文中，我们分析了 MIMO SAR 高分辨率宽测绘带遥感应用的虚拟天线阵列。研究了一维均匀和非均匀线性天线阵列，介绍了它们在高分辨率大测绘带遥感中的应用潜力。分析了虚拟天线阵列中非均匀空间采样的影响以及基于多通道滤波的重建算法。提供了概念系统和讨论。结果表明，利用MIMO SAR系统提供的虚拟天线阵列可以获得较高的操作灵活性和可重构性，从而获得令人满意的遥感性能。
Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) that employs multiple antennas to transmit orthogonal waveforms and multiple antennas to receive radar echoes is a recently proposed remote sensing concept. It has been shown that MIMO SAR can be used to improve remote sensing system performance. Most of the MIMO SAR research so far focused on signal/data models and corresponding signal processing algorithm. Little work related to MIMO SAR antenna analysis can be found. One of the main advantages of MIMO SAR is that the degrees of freedom can be greatly increased by the concept of virtual antenna array. In this paper, we analyze the virtual antenna array for MIMO SAR high-resolution wide-swath remote sensing applications. The one-dimensional uniform and nonuniform linear antenna arrays are investigated and their application potentials in high-resolution wide-swath remote sensing are introduced. The impacts of nonuniform spatial sampling in the virtual antenna array are analyzed, along with a multichannel filtering-based reconstruction algorithm. Conceptual system and discussions are provided. It is shown that high operation flexibility and reconfigurability can be obtained by utilizing the virtual antenna arrays provided by the MIMO SAR systems, thus enabling a satisfactory remote sensing performance.