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基于Keystone变换和扰动重采样的机动平台大斜视SAR成像方法

李根 马彦恒 侯建强 徐公国

引用本文: 李根, 马彦恒, 侯建强, 徐公国. 基于Keystone变换和扰动重采样的机动平台大斜视SAR成像方法[J]. 电子与信息学报, doi: 10.11999/JEIT190831 shu
Citation:  Gen LI, Yanheng MA, Jianqiang HOU, Gongguo XU. Maneuvering Platform High-squint SAR Imaging Method Based on Keystone Transform and Perturbation Resampling[J]. Journal of Electronics and Information Technology, doi: 10.11999/JEIT190831 shu

基于Keystone变换和扰动重采样的机动平台大斜视SAR成像方法

    作者简介: 李根: 男,1991年生,博士生,主要从事机动平台大斜视SAR成像和压缩感知雷达成像研究;
    马彦恒: 男,1968年生,教授,博士生导师,主要从事机动SAR成像、低小慢目标探测等方向的研究;
    侯建强: 男,1991年生,博士生,主要从事曲线SAR3维成像研究;
    徐公国: 男,1990年生,博士生,主要从事雷达信号处理与传感器融合研究
    通讯作者: 李根,radarlg@163.com
摘要: 加速度和下降速度的存在使机动平台大斜视SAR的成像参数存在明显的2维空变性,严重影响场景的聚焦深度。针对这个问题,该文提出了一种基于Keystone变换和扰动重采样的机动SAR成像方法。首先,通过距离走动校正和去加速处理实现距离方位解耦以及方位频谱去混叠,然后采用方位时域的Keystone变换校正空变的距离徙动;在方位压缩过程中,通过引入时域的高阶扰动因子去除多普勒参数的2阶及3阶方位空变性,然后通过方位频域的重采样处理去除多普勒参数的方位1阶空变性。所提方法能够有效校正距离徙动轨迹和方位聚焦参数的2维空变性,实现机动平台大斜SAR的大场景成像,仿真分析验证了所提方法的有效性。

English

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  • 图 1  机动平台大斜视SAR成像模型

    图 2  成像算法流程

    图 3  有效成像区域分析

    图 4  机动SAR成像目标分布示意图

    图 5  空变距离徙动校正结果

    图 6  点目标聚焦结果方位剖面图

    表 1  仿真参数

    参数数值参数数值
    载频15 GHz地面斜视角60°
    距离带宽300 MHz平台高度4 km
    合成孔径时间3 s中心斜距12 km
    脉冲宽度5 us速度(150, 0, –30) m/s
    脉冲重复频率1.5 kHz加速度(2.4, 0.8, –2.2) m/s2
    下载: 导出CSV

    表 2  点目标方位向测量指标

    测量指标FDPF方法[13]本文扰动重采样方法
    点1点2点3点1点2点3
    PSLR(dB)–3.98–13.26–4.78–12.68–13.27–13.39
    ISLR(dB)–7.11–9.83–6.78–9.37–9.81–10.28
    MW20.6715.6028.3515.6215.6115.62
    下载: 导出CSV
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  • 通讯作者:  李根, radarlg@163.com
  • 收稿日期:  2019-10-28
  • 网络出版日期:  2020-06-04
通讯作者: 陈斌, bchen63@163.com
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