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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >A Modified Fixed-Point Chirp Scaling Algorithm Based on Updating Phase Factors Regionally for Spaceborne SAR Real-Time Imaging
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A Modified Fixed-Point Chirp Scaling Algorithm Based on Updating Phase Factors Regionally for Spaceborne SAR Real-Time Imaging

机译：一种基于区域更新相位因子的修正定点线性调频缩放算法，用于星载SAR实时成像

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摘要

To realize real-time imaging for the spaceborne synthetic aperture radar (SAR) using the chirp scaling (CS) algorithm, high generation rates of phase factors and heavy computation loads are unavoidable. For example, updating phase factors continuously in the 2-D time or frequency space is difficult for generating phase factors for real-time imaging. To solve this problem, a modified CS algorithm based on updating phase factors regionally is proposed. Moreover, conventional floating-point arithmetic is unaffordable for real-time imaging onboard. Therefore, fixed-point processing is adopted. In the proposed imaging algorithm, the phase factors are updated only at some specified times and frequencies, and fixed-point operation is adopted. Furthermore, based on the paired echo theory and the finite word length error mathematical model, the effect of the proposed imaging algorithm on the SAR image quality is studied. Moreover, based on the above analysis and the experiments of Chinese HJ-1C and GF-3 spaceborne SAR practical measured data, a hardware system including digital signal processor and field-programmable gate array boards is constructed.
机译：为了使用线性调频缩放（CS）算法实现星载合成孔径雷达（SAR）的实时成像，不可避免的是相位因子的高生成率和繁重的计算负荷。例如，在二维时间或频率空间中连续更新相位因子对于生成用于实时成像的相位因子是困难的。为了解决这个问题，提出了一种基于局部更新相位因子的改进CS算法。而且，传统的浮点算法对于船上的实时成像是无法承受的。因此，采用定点处理。在提出的成像算法中，仅在某些指定的时间和频率处更新相位因子，并采用定点运算。此外，基于成对的回波理论和有限的字长误差数学模型，研究了所提出的成像算法对SAR图像质量的影响。此外，基于以上分析和中国HJ-1C和GF-3星载SAR实测数据的实验，构建了包括数字信号处理器和现场可编程门阵列板的硬件系统。

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  • 来源
    《IEEE Transactions on Geoscience and Remote Sensing.》 |2018年第12期|7436-7451|共16页
  • 作者

    Zegang Ding; Feng Xiao; Yizhuang Xie; Wenyue Yu; Zhu Yang; Liang Chen; Teng Long;

  • 作者单位

    Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

    Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

    Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

    Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

    Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

    Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

    Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Real-time systems; Synthetic aperture radar; Focusing; Spaceborne radar; Chirp;

    机译：实时系统;合成孔径雷达;聚焦;星载雷达;线性调频;

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