基于改进sinc插值的变PRF采样聚束SAR成像

陈世阳 黄丽佳 俞雷

陈世阳, 黄丽佳, 俞雷. 基于改进sinc插值的变PRF采样聚束SAR成像[J]. 雷达学报, 2019, 8(4): 527–536. doi: 10.12000/JR18095
引用本文: 陈世阳, 黄丽佳, 俞雷. 基于改进sinc插值的变PRF采样聚束SAR成像[J]. 雷达学报, 2019, 8(4): 527–536. doi: 10.12000/JR18095
CHEN Shiyang, HUANG Lijia, and YU Lei. A novel sinc interpolation for continuous PRF sampled sequences reconstruction in spotlight SAR[J]. Journal of Radars, 2019, 8(4): 527–536. doi: 10.12000/JR18095
Citation: CHEN Shiyang, HUANG Lijia, and YU Lei. A novel sinc interpolation for continuous PRF sampled sequences reconstruction in spotlight SAR[J]. Journal of Radars, 2019, 8(4): 527–536. doi: 10.12000/JR18095

基于改进sinc插值的变PRF采样聚束SAR成像

doi: 10.12000/JR18095
基金项目: 国家自然科学基金(61331017)
详细信息
    作者简介:

    陈世阳(1994–),男,硕士研究生,研究方向为合成孔径雷达信号处理。Email: m15528309300@163.com

    黄丽佳(1984–),女,博士,副研究员,硕士生导师,研究方向为合成孔径雷达信号处理与图像分析。Email: iecas8huanglijia@163.com

    俞雷:俞   雷(1979–),男,博士生,高级工程师。研究方向为合成孔径雷达系统、雷达信号处理和遥感应用处理。E-mail: ylanlei@buaa.edu.cn

    通讯作者:

    黄丽佳   iecas8huanglijia@163.com

  • 中图分类号: TN958

A Novel sinc Interpolation for Continuous PRF Sampled Sequences Reconstruction in Spotlight SAR

Funds: The National Science Foundation of China (61331017)
More Information
  • 摘要: 该文针对周期性变PRF采样高分辨率聚束模式合成孔径雷达(SAR)提出了一种改进的两步成像算法。变脉冲重复频率(PRF)设计可解决固定盲区等问题,是解决星载SAR高分宽幅矛盾的一种有效手段,但变PRF采样会引起频谱混叠和虚假目标等问题。该文从离散非均匀傅里叶变换原理出发,推导改进sinc插值核函数并建立了时域-时域的回波重建方法,将变PRF采样回波重构为均匀采样回波。此外将改进sinc插值与两步式成像算法结合,据此发展出针对非均匀采样回波的改进两步式聚束SAR成像算法,拓展了传统两步式成像算法的使用范围。仿真数据和实际数据处理结果验证了成像算法的有效性和精确性,并且改进sinc插值具备更高的计算效率。

     

  • 图  1  固定PRF时,排除星下点干扰和发射干扰后的时序图

    Figure  1.  Illustration of PRF excluded zones as a result of transmit and nadir interference

    图  2  给定参数下的盲区分布图

    Figure  2.  Blind ranges location for a given parameters of different PRI variations

    图  3  基于改进sinc插值的两步式成像算法流程图

    Figure  3.  Procedure of the two-step processing approach based on the modified sinc interpolation

    图  4  慢变PRI序列两步式成像方位包络

    Figure  4.  Azimuth envelope of slow PRI change by different two-step algorithms

    图  5  快变PRI序列两步式成像方位包络

    Figure  5.  Azimuth envelope of fast PRI change by different two-step algorithms

    图  6  高分三号数据处理结果

    Figure  6.  Experiments on GF-3 data

    表  1  快变慢变仿真参数

    Table  1.   SAR parameters of two types of PRI variation

    参数
    视角(°)49
    慢变PRF变化范围(Hz)3243~3355
    快变PRF变化范围(Hz)3243~5964
    方位向瞬时多普勒带宽(Hz)*2703
    方位向总带宽(Hz)**72703
    脉冲持续时间(μs)30
    慢变序列的一周期内脉冲数量110
    快变序列的一周期内脉冲数量64
    方位向分辨率0.1
    成像场景宽度(km)8
    *表示聚束成像模式中的方位向瞬时带宽,**表示聚束成像模式中的方位向总带宽,即瞬时带宽与场景固定带宽之和
    下载: 导出CSV

    表  2  计算量对比

    Table  2.   Complexity of calculation

    算法乘法运算量加法运算量总运算量
    NUDFTNa 2Na(Na–1)Na(2Na–1)
    改进sinc插值NaLNa(L–1)Na(2L–1)
    下载: 导出CSV

    表  3  虚假电平指标测量结果

    Table  3.   Estimation of false targets level

    PRF变化方式算法近距目标(dB)中距目标(dB)远距目标(dB)
    慢变PRF传统两步式成像算法–20.56–48.44–22.11
    两步式成像结合NUDFT–71.56–72.91–72.57
    两步式成像结合sinc插值–49.38–50.17–49.87
    两步式成像结合改进sinc插值–67.22–66.89–71.61
    快变PRF传统两步式成像算法–12.33–31.98–12.04
    两步式成像结合NUDFT–54.03–54.25–54.57
    两步式成像结合sinc插值–26.05–26.11–26.02
    两步式成像结合改进sinc插值–56.48–53.36–54.95
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-11-14
  • 修回日期:  2019-02-22
  • 刊出日期:  2019-08-28

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