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首页> 外文期刊>International journal of antennas and propagation >A Parasitic Array Receiver for ISAR Imaging of Ship Targets Using a Coastal Radar
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A Parasitic Array Receiver for ISAR Imaging of Ship Targets Using a Coastal Radar

机译：使用海岸雷达对舰船目标进行ISAR成像的寄生阵列接收器

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摘要

The detection and identification of ship targets navigating in coastal areas are essential in order to prevent maritime accidents and to take countermeasures against illegal activities. Usually, coastal radar systems are employed for the detection of vessels, whereas noncooperative ship targets as well as ships not equipped with AIS transponders can be identified by means of dedicated active radar imaging system by means of ISAR processing. In this work, we define a parasitic array receiver for ISAR imaging purposes based on the signal transmitted by an opportunistic coastal radar over its successive scans. In order to obtain the proper cross-range resolution, the physical aperture provided by the array is combined with the synthetic aperture provided by the target motion. By properly designing the array of passive devices, the system is able to correctly observe the signal reflected from the ships over successive scans of the coastal radar. Specifically, the upper bounded interelement spacing provides a correct angular sampling accordingly to the Nyquist theorem and the lower bounded number of elements of the array ensures the continuity of the observation during multiple scans. An ad hoc focusing technique has been then proposed to provide the ISAR images of the ships. Simulated analysis proved the effectiveness of the proposed system to provide top-view images of ship targets suitable for ATR procedures.
机译：为了防止海事事故并采取打击非法活动的对策，必须对沿海地区航行的船舶目标进行检测和识别。通常，沿海雷达系统用于检测船舶，而非合作船舶目标以及未配备AIS应答器的船舶可以通过专用主动雷达成像系统通过ISAR处理来识别。在这项工作中，我们基于机会海岸雷达连续扫描发送的信号，定义了用于ISAR成像的寄生阵列接收器。为了获得适当的跨范围分辨率，将阵列提供的物理孔径与目标运动提供的合成孔径相结合。通过正确设计无源设备阵列，该系统能够在连续雷达连续扫描期间正确观察从舰船反射的信号。具体而言，元素间的上界间距对应于奈奎斯特定理提供了正确的角度采样，并且数组中元素的下界数确保了多次扫描期间观察的连续性。然后，提出了一种特殊的聚焦技术来提供舰船的ISAR图像。仿真分析证明了所提系统提供适合ATR程序的舰船目标俯视图的有效性。

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  • 来源
    《International journal of antennas and propagation》 |2016年第2期|8485305.1-8485305.11|共11页
  • 作者

    Santi Fabrizio; Pastina Debora;

  • 作者单位

    Univ Roma La Sapienza, Dept Informat Engn Elect & Telecommun, Via Eudossiana 18, I-00184 Rome, Italy;

    Univ Roma La Sapienza, Dept Informat Engn Elect & Telecommun, Via Eudossiana 18, I-00184 Rome, Italy;

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