天波超视距雷达非均匀采样信号频谱重构

doi:10.12305/j.issn.1001-506X.2024.04.12

摘要/Abstract

摘要：

受瞬态干扰影响和空海同时探测的需求，在长相参积累时间条件下，天波超视距雷达(over-the-horizon radar, OTHR)回波信号的有效采样点往往缺损且非均匀，严重影响目标检测性能。针对此问题, 提出了一种基于压缩感知的OTHR频谱重构方法。首先, 建立了OTHR频域信号的稀疏模型; 然后, 提出了快速自适应复近似消息传递(fast adaptive complex approximate message passing, FACAMP)频谱重构算法并给出了算法实现步骤; 最后, 利用FACAMP算法实现了OTHR频谱重构并分析了重构性能。与现有重构算法相比, FACAMP算法具有重构精度高、运算复杂度低、可自适应调整参数和保留背景噪声高斯性的优势。理论分析和仿真实验均验证了所提算法的有效性。

关键词: 天波超视距雷达, 压缩感知, 频谱重构, 复近似消息传递

Abstract:

Due to the influence of transient interference and the requirement of simultaneous air and sea detection, under the condition of long coherent integration time, the effective sampling points of the skywave over-the-horizon radar (OTHR) echo signal are often defective and non-uniform, seriously affecting the performance of target detection. To solve this problem, an OTHR spectrum reconstruction method is proposed based on compressed sensing. Firstly, the sparse model of OTHR frequency domain signal is established. Secondly, a fast adaptive complex approximate message passing (FACAMP) algorithm is proposed and its implementation steps are given. Finally, the OTHR spectrum reconfiguration is implemented using FACAMP algorithm and the reconfiguration performance is analyzed. Compared with existing reconstruction algorithms, FACAMP algorithm has the advantages of high reconstruction accuracy, low computational complexity, adaptive parameter adjustment and retaining the Gaussian property of background noise. Both theoretical analysis and simulation experiments verify the effectiveness of the proposed algorithm.

Key words: over-the-horizon radar (OTHR), compressed sensing, spectrum reconstruction, complex approximation messaging passing (FACAMP)

中图分类号:

TN958.93

陈子睿, 陈阿磊, 刘维建, 杨军, 陈文峰, 马晓岩. 天波超视距雷达非均匀采样信号频谱重构[J]. 系统工程与电子技术, 2024, 46(4): 1236-1246.

Zirui CHEN, Alei CHEN, Weijian LIU, Jun YANG, Wenfeng CHEN, Xiaoyan MA. Spectrum reconstruction of nonuniformly sampled signals for over-the-horizon radar[J]. Systems Engineering and Electronics, 2024, 46(4): 1236-1246.

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参数	目标1	目标2	目标3
信噪比/dB	26.517	20.454	29.515
相参积累增益/dB	25.934	26.084	26.551
频率/Hz	1.160	2.116	-0.795

算法	M=256		M=400
算法	运算时间/s	NMSE/dB	运算时间/s	NMSE/dB
OMP	15.810	-25.11	21.430	-29.89
ACAMP	29.640	-23.26	31.510	-33.21
RPCA-SVT	737.900	-16.71	478.300	-30.93
IALM	2 455.000	-11.85	2 421.000	-34.37
FACAMP	0.982	-26.37	1.125	-34.21

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