亚奈奎斯特采样雷达的运动目标回波信号的快速重构

doi:10.3969/j.issn.0372-2112.2019.10.011

电子学报 ›› 2019, Vol. 47 ›› Issue (10): 2098-2107.DOI: 10.3969/j.issn.0372-2112.2019.10.011

亚奈奎斯特采样雷达的运动目标回波信号的快速重构

张素玲, 陈胜垚, 席峰, 刘中

南京理工大学电子工程系, 江苏南京 210094

收稿日期:2018-07-23 修回日期:2019-01-02 出版日期:2019-10-25
- 通讯作者:
- 刘中
- 作者简介:
- 张素玲 女,1985年12月出生于河南博爱,南京理工大学博士生,研究方向为压缩采样、雷达信号处理.E-mail:zsljust@163.com;陈胜垚 男,1985年10月出生于安徽庐江,南京理工大学副教授,硕士生导师,研究方向为压缩采样、雷达信号处理.E-mail:chenshengyao@njust.edu.cn;席峰男,1980年11月出生于江苏宜兴,南京理工大学副教授,硕士生导师,研究方向为压缩感知理论、雷达信号处理、传感器网络.E-mail:xifeng@njust.edu.cn
- 基金资助:
- 国家自然科学基金 (No.61571228，No.61671245）

Fast Reconstruction of Moving Target Echoes Based on Sub-Nyquist Radar

ZHANG Su-ling, CHEN Sheng-yao, XI Feng, LIU Zhong

Department of Electronic Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China

Received:2018-07-23 Revised:2019-01-02 Online:2019-10-25 Published:2019-10-25
- Corresponding author:
- LIU Zhong
- Supported by:
- National Natural Science Foundation of China (No.61571228, No.61671245)

摘要/Abstract

摘要： 亚奈奎斯特采样雷达是利用回波信号的稀疏性，基于模信转换系统发展起来的欠采样雷达系统.本文研究亚奈奎斯特采样雷达的运动目标回波信号的快速重构问题.与单脉冲回波重构不同，运动目标在脉冲积累时间内可能产生跨距离单元现象，使得回波信号表示系数呈现稀疏时变性.本文采用概率分布模型描述稀疏位置的变化，首先将多脉冲回波信号重构转化为加权稀疏重构问题；然后根据分段滑动重构思想，提出一种基于正交投影的加权稀疏分段滑动重构方法来实现快速重构.该方法利用前一个脉冲稀疏位置估计信息，构造分段产生干扰的正交补空间，将子段压缩测量投影到构造的正交补空间，有效地抑制了相邻段引入的干扰.数值仿真验证了方法的有效性.

关键词: 压缩采样, 稀疏时变, 加权稀疏重构, 分段滑动重构, 正交投影

Abstract: Sub-Nyquist radar is an analog-to-information based radar system with the assumption of sparse echo signals. We study the reconstruction of moving target echoes obtained from the sub-Nyquist radar. Different from the reconstruction of echo signals from a single pulse, the moving targets may be across range cells in a coherent processing interval and thus the echo signals have the property of the time-varying sparsity. However, it has been found that the sparse positions obey a probabilistic distribution and then a random model is adopted to describe the sparsity. The reconstruction of the multiple echoes is transformed into a weighted sparse reconstruction problem. An orthogonal-projection-based weighted sparse segment-sliding reconstruction (OP-WSegSR) scheme is proposed in this paper. Utilizing the estimation of sparse positions in the previous pulse, the scheme projects the measurements of the current segment onto the orthogonal complement subspace spanned by the interference generated in the segmentation process and then the adjacent interference is greatly rejected. Simulations show the effectiveness of the OP-WSegSR scheme.

Key words: compressive sampling, time-varying sparsity, weighted sparse reconstruction, segment-sliding reconstruction, orthogonal projection

中图分类号:

TN911.7

张素玲, 陈胜垚, 席峰, 等. 亚奈奎斯特采样雷达的运动目标回波信号的快速重构[J]. 电子学报, 2019, 47(10): 2098-2107.

ZHANG Su-ling, CHEN Sheng-yao, XI Feng, et al. Fast Reconstruction of Moving Target Echoes Based on Sub-Nyquist Radar[J]. Acta Electronica Sinica, 2019, 47(10): 2098-2107.

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亚奈奎斯特采样雷达的运动目标回波信号的快速重构

Fast Reconstruction of Moving Target Echoes Based on Sub-Nyquist Radar

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