Near-Field Millimeter-Wave Phased Array Imaging With Compressive Sensin
Near-Field Millimeter-Wave Phased Array Imaging With Compressive Sensin
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DOI：
10.1109/access.2017.2753881
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Hao, Yang
中科院分区：
文献类型：
--
作者：
Cheng, Qiao;Alomainy, Akram;Hao, Yang
相控阵技术允许雷达成像系统的快速电子束转向和高天线增益。目前，常用的算法主要集中在目标在远场区域的情况下；然而，在近场区域，波束形成性能会受到影响。提出了一种基于压缩感知的近场相控阵成像方法。在近场聚焦技术的基础上提出了一种新的数据采集方法。CS测量是通过在近场区域随机聚焦光束进行的。与远场成像方法相比，该方法在存在噪声和背景干扰的情况下表现出优越的成像性能。此外，近场法能较好地减小因天线单元间距过大而引起的光栅瓣问题。最后，我们证明了CS成像系统的分辨能力会受到目标稀疏度的影响。
Phased array technology allows for fast electronic beam steering with high antenna gain for radar imaging systems. Currently, common algorithms mainly concentrate on scenarios where targets are in the far-field zone; however, the beamforming performance will be impaired in the near-field zone. This paper presents a compressive sensing (CS)-based phased array imaging method for near-field applications. A novel data acquisition methodology has been proposed on the basis of near-field focusing techniques. CS measurements are taken by randomly focusing beams in the near-field region. When compared with the far-field imaging approach, the proposed method shows superior performance in the presence of noise and background interference. Moreover, the near-field method can better minimize the grating lobe issues caused by using large antenna element spacing. Finally, we show that the resolving power of CS imaging systems can be affected by target sparsity.