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Radar imaging by using GTD near-field model and antenna array-factor

机译:利用GTD近场模型和天线阵列因子进行雷达成像

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摘要

As one of the image processing method of radar sensor, it is most typical method which employs synthetic aperture radar (SAR) processing. In this paper we investigate radar image of scattering models by using an extended idea of array-factor (AF) in antenna theory. Applying phase difference between each element of the array becomes so-called phased array beam-forming and weighting to each element becomes adaptive beam processing [1], [2]. Also, regarding AF as near sources, it has been directly applied to far-field transforming algorithm [3]. Since AF is considered as a sum of delayed phase signals from each antenna element, we can construct image of the signal from the sum which depends on degree of phase matching between the receiving signal and its coordinate. This procedure is a kind of aperture synthesis, also known as delay and sum (DAS), especially in the field of ultrasound medical imaging and acoustics [4].
机译:作为雷达传感器的图像处理方法之一,是最典型的采用合成孔径雷达(SAR)处理的方法。在本文中,我们通过在天线理论中使用阵列因子(AF)的扩展思想来研究散射模型的雷达图像。在阵列的每个元素之间施加相位差将成为所谓的相控阵波束成形,而对每个元素的加权将成为自适应波束处理[1],[2]。同样,将AF视为近源,它已直接应用于远场变换算法[3]。由于AF被认为是来自每个天线元件的延迟相位信号之和,因此我们可以根据该总和构造信号的图像,该图像取决于接收信号及其坐标之间的相位匹配程度。此过程是一种孔径合成,也称为延迟与总和(DAS),特别是在超声医学成像和声学领域[4]。

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