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Target Image Enhancement in Radar Imaging Using Fractional Fourier Transform

机译:使用分数阶傅里叶变换的雷达成像中的目标图像增强

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摘要

This paper presents a new Range-Doppler Algorithm based on Fractional Fourier Transform (RDA-FrFT) to obtain High-Resolution (HR) images for targets in radar imaging. The performance of the proposed RDA-FrFT is compared with the classical RDA algorithm, which is based on the Fast Fourier Transform (FFT). A closed-form expression for the range and azimuth compression of the proposed RDA-FrFT is mathematically derived and analyzed from the HR Synthetic Aperture Radar (SAR) imaging point of view. The proposed RDA-FrFT takes its advantage of the property of the FrFT to resolve chirp signals with high precision. Results show that the proposed RDA-FrFT gives low Peak Side-Lobe (PSL) and Integrated Side-Lobe (ISL) levels in range and azimuth directions for detected targets. HR images are obtained using the proposed RDA-FrFT algorithm.
机译:本文提出了一种基于分数阶傅里叶变换(RDA-FrFT)的新型距离多普勒算法,以获取雷达成像目标的高分辨率(HR)图像。将所提出的RDA-FrFT的性能与基于快速傅里叶变换(FFT)的经典RDA算法进行了比较。从HR合成孔径雷达(SAR)成像角度,以数学方式得出并分析了所提出的RDA-FrFT的射程和方位角压缩的闭式表达式。提出的RDA-FrFT利用了FrFT的特性来高精度解析线性调频信号。结果表明,所提出的RDA-FrFT在所检测目标的范围和方位方向上给出了较低的峰值旁瓣(PSL)和集成的旁瓣(ISL)水平。使用建议的RDA-FrFT算法获得HR图像。

著录项

  • 来源
    《Sensing and imaging》 |2012年第1期|p.37-53|共17页
  • 作者单位

    Department of Electronics and Electrical Communications, Faculty of Electronic Engineering,Menoufia University, Menouf 32952, Egypt;

    Department of Electronics and Electrical Communications, Faculty of Electronic Engineering,Menoufia University, Menouf 32952, Egypt;

    Department of Electronics and Electrical Communications, Faculty of Electronic Engineering,Menoufia University, Menouf 32952, Egypt;

    Department of Electronics and Electrical Communications, Faculty of Electronic Engineering,Menoufia University, Menouf 32952, Egypt;

    Department of Electronics and Electrical Communications, Faculty of Electronic Engineering,Menoufia University, Menouf 32952, Egypt;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SAR; RDA-FrFT; azimuth; resolution; chirp signal;

    机译:SAR;RDA-FrFT;方位角解析度;信号;

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