系统工程与电子技术 ›› 2022, Vol. 44 ›› Issue (10): 3029-3036.doi: 10.12305/j.issn.1001-506X.2022.10.05

• 电子技术 • 上一篇    下一篇

强杂波下基于压缩感知的低空风切变速度解模糊

李海1,*, 呼延泽1, 毛志杰2   

  1. 1. 中国民航大学电子信息与自动化学院, 天津 300300
    2. 国防科技大学信息通信学院, 陕西 西安 710106
  • 收稿日期:2021-03-17 出版日期:2022-09-20 发布日期:2022-10-24
  • 通讯作者: 李海
  • 作者简介:李海(1976—), 男, 教授, 博士, 主要研究方向为机载气象雷达信号处理、分布式目标检测与参数估计、自适应信号处理|呼延泽(1995—), 女, 硕士研究生, 主要研究方向为机载气象雷达信号处理|毛志杰(1972—), 男, 教授, 博士, 主要研究方向为通信与信号处理及应用研究
  • 基金资助:
    民机项目(MJ-2018-S-28);天津市自然基金重点项目(20JCZDJC00490);天津市自然基金重点项目(19JCQNJC01000)

Low-altitude wind-shear velocity ambiguity resolution based on compressed sensing under strong clutter

Hai LI1,*, Ze HUYAN1, Zhijie MAO2   

  1. 1. College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China
    2. College of Information and Communication, National University of Defense Technology, Xi'an 710106, China
  • Received:2021-03-17 Online:2022-09-20 Published:2022-10-24
  • Contact: Hai LI

摘要:

毫米波线性调频连续波(linear frequency modulated continuous wave, LFMCW)雷达进行低空风切变检测时, 会严重受到地杂波信号干扰, 并且风速估值模糊。针对该问题, 本文提出强杂波背景下利用压缩感知实现低空风切变速度解模糊。该方法依据多重频脉组参差方式下雷达回波的非均匀欠采样特性在角度-多普勒域中构建无模糊冗余字典(感知矩阵), 之后利用压缩感知技术提取杂波谱主要分量, 估计杂波能量支撑区, 建立杂波抑制矩阵, 接着基于加权的最小l1范数优化模型实现杂波抑制并恢复出低空风切变在角度-多普勒域中不模糊的稀疏向量, 得到风场无模糊多普勒信息, 最终求得准确的速度值。

关键词: 毫米波线性调频连续波雷达, 压缩感知, 强杂波, 低空风切变, 速度解模糊

Abstract:

When millimeter wave linear frequency modulated continuous wave (LFMCW) radar detects low-altitude wind-shear, it is severely interfered by ground clutter signals, and the wind velocity estimation is ambiguous. In response to this problem, this paper proposes a low-altitude wind-shear velocity ambiguity resolution method based on compressed sensing in the background of strong clutter. According to the non-uniform undersampling characteristics of radar echo in multi frequency and pulse group stagger mode, the unambiguous redundant dictionary (sensing matrix) is constructed in the angle Doppler domain. Then, the main components of clutter spectrum are extracted by compressed sensing technology, the clutter energy support area is estimated, and the clutter suppression matrix is established. Then the clutter suppression based on the weighted minimum l1 norm optimization model is implemented, the unambiguous sparse vector of the low-altitude wind-shear is restored in the angle Doppler domain and the unambiguous Doppler information of the wind field is obtained. The accurate velocity is finally obtained.

Key words: millimeter wave linear frequency modulated continuous wave (LFMCW) radar, compressed sensing, strong clutter, low-altitude wind-shear, velocity ambiguity resolution

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