基于方位相位编码的脉内聚束SAR成像方法

吴玉峰 叶少华 冯大政

吴玉峰, 叶少华, 冯大政. 基于方位相位编码的脉内聚束SAR成像方法[J]. 雷达学报, 2018, 7(4): 437-445. doi: 10.12000/JR17114
引用本文: 吴玉峰, 叶少华, 冯大政. 基于方位相位编码的脉内聚束SAR成像方法[J]. 雷达学报, 2018, 7(4): 437-445. doi: 10.12000/JR17114
Wu Yufeng, Ye Shaohua, Feng Dazheng. Intra-pulse Spotlight SAR Imaging Method Based on Azimuth Phase Coding[J]. Journal of Radars, 2018, 7(4): 437-445. doi: 10.12000/JR17114
Citation: Wu Yufeng, Ye Shaohua, Feng Dazheng. Intra-pulse Spotlight SAR Imaging Method Based on Azimuth Phase Coding[J]. Journal of Radars, 2018, 7(4): 437-445. doi: 10.12000/JR17114

基于方位相位编码的脉内聚束SAR成像方法

doi: 10.12000/JR17114
基金项目: 航空基金(2015ZC07005)
详细信息
    作者简介:

    吴玉峰(1985–),男,浙江衢州人,博士,工程师。现为中国航空工业集团公司雷华电子技术研究所系统工程师,主要研究方向为SAR系统设计、SAR成像算法。E-mail: wyf1176@163.com

    叶少华(1966–),男,江苏江阴人,研究员,副总工程师。现为中国航空工业集团公司雷华电子技术研究所副总工程师,主要研究方向为雷达系统设计、雷达信号处理。E-mail: ye_shaohua@sina.com

    冯大政(1959–),男,陕西安康人,教授,博士生导师。现为西安电子科技大学电子工程学院二级教授,主要研究方向为雷达信号处理、类脑神经网络和图像处理等。E-mail: dzfeng@xidian.edu.cn

    通讯作者:

    吴玉峰   wyf1176@163.com

Intra-pulse Spotlight SAR Imaging Method Based on Azimuth Phase Coding

Funds: The Aeronautical Foundation of China (2015ZC07005)
  • 摘要: 脉内聚束模式有效克服了星载合成孔径雷达(Synthetic Aperture Radar, SAR)高分辨率与宽测绘带之间的矛盾,同时可以兼顾回波的信噪比。然而距离维空域滤波的信号分离方法容易受地形起伏的影响,甚至失效。针对此,该文提出了一种结合方位相位编码(Azimuth Phase Coding, APC)的脉内聚束SAR成像方法,利用APC技术使不同子脉冲回波的方位频谱处在不同的脉冲重复频率(Pulse Repetition Frequencies, PRF)范围,然后利用方位自适应波束形成技术来分离回波信号。文中对信号分离方法以及频移因子的选择进行了详细的讨论。最后仿真实验结果验证了所提方法的有效性。

     

  • 图  1  方位多通道脉内聚束SAR收发信号模型

    Figure  1.  Transmitting and receiving signal modes of azimuth multi-channel intra-pulse spotlight SAR

    图  2  斜距平面成像几何

    Figure  2.  Imaging geometry in the slant-range plane

    图  3  不同方位子场景回波信号的时频关系

    Figure  3.  Time-frequency relation of different azimuth sub-scene echo signal

    图  4  引入APC技术后的时频关系

    Figure  4.  Time-frequency relation after adopting the APC technique

    图  5  某一通道的回波信号及其频谱

    Figure  5.  Echo signal and spectrum of one channel

    图  6  文献[13]方法信号分离结果

    Figure  6.  Signal division results by the method in Ref. [13]

    图  7  本文方法信号分离结果

    Figure  7.  Signal division results by the method in the paper

    图  8  完整的多普勒频谱以及成像结果

    Figure  8.  Imaging result of the combined complete Doppler spectrum

    图  9  面目标仿真结果

    Figure  9.  Simulation results of area target

    表  1  仿真参数

    Table  1.   Simulation parameters

    参数 参数
    雷达载频(GHz) 9.65 方位孔径(m) 4.8
    脉冲总时宽(μs) 30 脉冲重复频率(Hz) 3600
    子脉冲信号带宽(MHz) 150 场景中心距离(km) 596
    采样频率(MHz) 180 子脉冲个数 3
    平台速度(m/s) 7200 方位通道数 3
    下载: 导出CSV

    表  2  成像性能参数统计

    Table  2.   Parameters of the focused targets

    距离向 方位向
    PSLR (dB) –13.28 PSLR (dB) –13.28
    ISLR (dB) –9.67 ISLR (dB) –9.81
    分辨率 (m) 1.0087 分辨率 (m) 0.8157
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-11-28
  • 修回日期:  2018-02-07
  • 网络出版日期:  2018-08-28

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