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短脉冲非相参雷达的逆合成孔径成像及其稀疏恢复成像技术

汪海波 黄文华 巴涛 姜悦

引用本文: 汪海波, 黄文华, 巴涛, 姜悦. 短脉冲非相参雷达的逆合成孔径成像及其稀疏恢复成像技术[J]. 电子与信息学报, doi: 10.11999/JEIT180912 shu
Citation:  Haibo WANG, Wenhua HUANG, Tao Ba, Yue JIANG. Inverse Synthetic Aperture Radar Imaging with Non-Coherent Short Pulse Radar and its Sparse Recovery[J]. Journal of Electronics and Information Technology, doi: 10.11999/JEIT180912 shu

短脉冲非相参雷达的逆合成孔径成像及其稀疏恢复成像技术

    作者简介: 汪海波: 男,1987年生,工程师,研究方向为高功率微波技术和雷达信号处理;
    黄文华: 男,1968年生,研究员,博士生导师,研究方向为高功率微波技术;
    姜悦: 女,1989年生,工程师,研究方向为高功率微波技术、特征提取与目标识别;
    通讯作者: 汪海波, wanghaibo@nint.ac.cn
摘要: 短脉冲非相参雷达(NCSP)的辐射源输出微波脉冲持续时间短,针对于高速运动目标而言,其脉冲持续时间内的目标运动可忽略不计,对回波信号不需进行专门的脉冲内运动补偿。为了利用短脉冲非相参雷达信号进行逆合成孔径雷达成像,该文应用补偿相参处理的方法,去除辐射信号包络时间不确定性和初始相位的不确定性影响,在常规方法进行包络对齐和初相补偿后可利用距离-多普勒(RD)方法进行逆合成孔径雷达成像,仿真验证了补偿后信号成像的可行性。然而,短脉冲非相参雷达的载频随机抖动的因素会导致距离-多普勒成像结果在多普勒维度产生随机调制的旁瓣,影响成像的质量。利用稀疏恢复技术,在成像空间中对目标的散射中心进行稀疏重构,利用正交匹配追踪(OMP)算法和稀疏贝叶斯学习(SBL)算法进行成像,从而实现了抑制非相参因素引起的成像旁瓣,改进了成像质量,通过仿真验证了方法可行性。

English

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  • 图 1  短脉冲非相参雷达系统结构

    图 2  3种信号对运动目标回波的对比

    图 3  成像几何模型

    图 4  点目标模型的设定

    图 5  频率抖动示意

    图 6  RD成像结果

    图 7  稀疏恢复成像结果

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文章相关
  • 通讯作者:  汪海波, wanghaibo@nint.ac.cn
  • 收稿日期:  2018-09-21
  • 录用日期:  2019-01-12
  • 网络出版日期:  2019-05-20
通讯作者: 陈斌, bchen63@163.com
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