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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >A Modified Cartesian Factorized Back-Projection Algorithm for Highly Squint Spotlight Synthetic Aperture Radar Imaging
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A Modified Cartesian Factorized Back-Projection Algorithm for Highly Squint Spotlight Synthetic Aperture Radar Imaging

机译：一种改进的笛卡尔分解背投影算法，用于高斜度聚光灯合成孔径雷达成像

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摘要

Highly squint synthetic aperture radar (SAR) increases the flexibility and aspect-information of observation but poses several challenges to frequency-domain algorithms. The back-projection (BP) algorithm is recognized to produce the best results for highly squint mode but at high computational expense. Several fast BP algorithms have been developed to enhance the efficiency of the BP integral. The Cartesian factorized BP (CFBP) algorithm has been proposed to improve the performance. However, CFBP is ineffective in the highly squint case because its range model (RM) is imprecise. In this letter, we propose a modified CFBP (MCFBP) algorithm for highly squint spotlight SAR imaging. We employ a transformed Cartesian coordinate system to treat the transceiver mode as approximately side-looking mode. According to the transformed coordinate system, we propose a modified RM (MRM) to reduce the range error. Based on the MRM, we derive modified image spectrum compression steps and the Nyquist sampling rate of the subaperture image. MCFBP inherits CFBP's accuracy and efficiency advantages. Results of simulations and experiments performed by the X-band airborne SAR system with a maximum bandwidth of 1.2 GHz validate the improved performance of the proposed algorithm relative to BP and fast factorized BP.
机译：斜视高度很高的合成孔径雷达（SAR）可以提高观测的灵活性和纵横比信息，但对频域算法提出了一些挑战。公认的反投影（BP）算法可在高斜视模式下产生最佳结果，但计算量较大。已经开发了几种快速的BP算法来增强BP积分的效率。提出了笛卡尔分解BP（CFBP）算法来提高性能。但是，CFBP在高度斜视的情况下无效，因为它的范围模型（RM）不精确。在这封信中，我们提出了一种改进的CFBP（MCFBP）算法，用于高度斜视的聚光SAR成像。我们采用变换后的笛卡尔坐标系将收发器模式视为近似侧视图模式。根据变换后的坐标系，我们提出了一种改进的RM（MRM），以减少距离误差。基于MRM，我们推导了修改后的图像光谱压缩步骤和子孔径图像的奈奎斯特采样率。 MCFBP继承了CFBP的准确性和效率优势。 X波段机载SAR系统的最大带宽为1.2 GHz的仿真和实验结果验证了所提出算法相对于BP和快速分解BP的改进性能。

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  • 来源
    《IEEE Geoscience and Remote Sensing Letters》 |2019年第6期|902-906|共5页
  • 作者

    Luo Yin; Zhao Fengjun; Li Ning; Zhang Heng;

  • 作者单位

    Chinese Acad Sci, Inst Elect, Dept Space Microwave Remote Sensing Syst, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Sch Elect Elect & Commun Engn, Beijing 100039, Peoples R China;

    Chinese Acad Sci, Inst Elect, Dept Space Microwave Remote Sensing Syst, Beijing 100190, Peoples R China;

    Henan Univ, Sch Comp & Informat Engn, Kaifeng 475004, Peoples R China|Henan Univ, Key Lab Big Data Anal & Proc Henan Prov, Kaifeng 475004, Peoples R China;

    Chinese Acad Sci, Inst Elect, Dept Space Microwave Remote Sensing Syst, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Sch Elect Elect & Commun Engn, Beijing 100039, Peoples R China;

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

    Back-projection (BP); Cartesian factorized BP (CFBP); highly squint spotlight synthetic aperture radar (SAR); SAR;

    机译：背投（BP）;笛卡尔分解BP（CFBP）;高度斜视聚光灯合成孔径雷达（SAR）;SAR;

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