Extending the classical aperture determined angular resolution limits of array antennas for radar applications

J. Detlefsen
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Abstract

The angular resolution and the angular width of the field of view are in the frame of autonomous intelligent cruise control (AICC) critical system parameters. A promising solution which avoids conventional phased array techniques and a large number of receivers is to use an array of receivers and the methods of digital beamforming in order to extract the complete 2D radar information. The angular resolution is in this case closely related to the number of receiving antennas and their aperture size. This paper shows that the angular resolution can be considerably improved without increasing the number of antennas and receivers by using several apertures for transmitting purposes. The results indicate that by sequentially using different transmitting aperture locations angular resolution can be improved beyond the classical Rayleigh limits using conventional beamforming techniques. Linear prediction algorithms can be applied additionally.
扩展经典孔径决定了雷达阵列天线的角分辨率极限
视场角分辨率和视场角宽度是自动智能巡航控制(AICC)系统的关键参数。利用接收机阵列和数字波束形成的方法来提取完整的二维雷达信息是一种很有前途的解决方案,可以避免传统的相控阵技术和大量的接收机。在这种情况下,角分辨率与接收天线的数量及其孔径大小密切相关。本文表明,在不增加天线和接收机数量的情况下,通过使用几个孔径进行发射,可以大大提高角分辨率。结果表明,采用传统波束形成技术,通过依次使用不同的发射孔径位置,可以提高角分辨率,使其超出经典的瑞利极限。线性预测算法也可以应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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