基于四阶累积量的机载多基线SAR谱估计解叠掩方法

张斌 韦立登 胡庆荣 李爽

张斌, 韦立登, 胡庆荣, 李爽. 基于四阶累积量的机载多基线SAR谱估计解叠掩方法[J]. 雷达学报, 2018, 7(6): 740-749. doi: 10.12000/JR18087
引用本文: 张斌, 韦立登, 胡庆荣, 李爽. 基于四阶累积量的机载多基线SAR谱估计解叠掩方法[J]. 雷达学报, 2018, 7(6): 740-749. doi: 10.12000/JR18087
Zhang Bin, Wei Lideng, Hu Qingrong, Li Shuang. Solution to Layover Problemin Airborne Multi-baseline SAR Based on Spectrum Estimation with Fourth-order Cumulant[J]. Journal of Radars, 2018, 7(6): 740-749. doi: 10.12000/JR18087
Citation: Zhang Bin, Wei Lideng, Hu Qingrong, Li Shuang. Solution to Layover Problemin Airborne Multi-baseline SAR Based on Spectrum Estimation with Fourth-order Cumulant[J]. Journal of Radars, 2018, 7(6): 740-749. doi: 10.12000/JR18087

基于四阶累积量的机载多基线SAR谱估计解叠掩方法

doi: 10.12000/JR18087
基金项目: 国家科技部重点项目
详细信息
    作者简介:

    张 斌(1990–),男,博士生,研究方向为机载InSAR处理与TomoSAR技术。E-mail: zbhian123@163.com

    韦立登(1973–),男,研究员,研究方向为机载SAR成像与InSAR处理

    胡庆荣(1974–),男,研究员,研究方向为雷达总体技术与机载SAR成像

    李 爽(1982–),女,高级工程师,研究方向为星载InSAR仿真与数据处理

    通讯作者:

    张斌   zbhian123@163.com

  • 中图分类号: TN957.52

Solution to Layover Problemin Airborne Multi-baseline SAR Based on Spectrum Estimation with Fourth-order Cumulant

Funds: Key Projects of the Ministry of Science and Technology of China
  • 摘要: 叠掩问题是SAR成像处理的一个技术难点,在机载多基线SAR系统中,传统的谱估计解叠掩方法受到非均匀基线和基线数目少的限制,使得其在解叠掩过程中的散射点高度向测量误差大、分辨性能差。针对以上问题,该文将4阶累积量统计特性用于传统的谱估计解叠掩方法中,利用4阶累积量的盲高斯性和非均匀阵列的虚拟阵列扩展性能,结合传统的Capon, MUSIC谱估计方法,能在有效去除高斯噪声的同时,提高叠掩处各散射点的高度向测量精度及分辨率。仿真和实测数据实验证明了该文方法的有效性。

     

  • 图  1  多基线SAR叠掩成像模型

    Figure  1.  Layover model of multi-baseline SAR

    图  2  散射点高度估计随SNR变化结果

    Figure  2.  Height estimation results via SNR

    图  3  散射点高度估计随视数变化结果

    Figure  3.  Height estimation results via number of looks

    图  4  散射点高度估计随高度差变化结果

    Figure  4.  Height estimation results via height differences

    图  5  高度-归一化谱分布

    Figure  5.  Height-normalized spectral distribution

    图  6  原始数据图

    Figure  6.  Raw SAR data

    图  7  图像散射点个数

    Figure  7.  Numbers of scattering points

    图  8  高度-归一化谱函数

    Figure  8.  Height-normalized spectral distribution

    图  9  剖面散射点高度分布图

    Figure  9.  Height profile of scattering points

    图  10  叠掩处散射点高度差统计

    Figure  10.  Height difference statistics of scattering points in layover

    表  1  系统仿真参数

    Table  1.   System parameters of simulation data

    传感器 MEMPHIS
    载频(GHz) 35
    下视角 $\theta $(°) 60
    基线长度(m) 0, 0.055, 0.165, 0.275
    斜距(m) 1545
    SNR(dB) 20
    基线倾角 $\alpha $(°) 60
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-10-15
  • 修回日期:  2018-12-11
  • 网络出版日期:  2018-12-28

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