基于复迭代滤波的连续波调频雷达同频非相参调频干扰抑制方法

doi:10.12382/bgxb.2023.0996

摘要/Abstract

摘要：

针对连续波调频(Frequency Modulation Continuous Wave, FMCW)雷达易被同频非相参调频信号干扰的问题,设计基于复迭代滤波(Complex Iterative Filtering, CIF)的干扰抑制方法。根据FMCW雷达目标回波差频信号为多个单音信号叠加以及干扰差频信号为覆盖雷达通带的调频信号的特点,采用所提的CIF方法将FMCW雷达输出差频信号分解在本征模态函数(Intrinsic Mode Function, IMF)域,并通过各IMF恒虚警检测获得干扰信号能量分布位置,设计干扰能量剔除及目标回波差频信号幅相重构方法实现干扰抑制。通过仿真和实测数据验证了抗干扰方法的有效性。实验结果表明,在低于-20dB信干噪比条件下,所提方法能够有效抑制同频非相参调频信号的干扰。

关键词: 连续波调频, 同频干扰, 干扰抑制, 复迭代滤波, 本征模态函数

Abstract:

An interference suppression approach based on complex iterative filtering (CIF) is designed to address the issue of frequency modulation continuous wave (FMCW) radar being susceptible to FM interference which has the same bandwidth with the radar. Based on the fact that the beat signal of target echo is a superposition of multiple single tone signal but the beat signal of interference is an FM signal covering the bandwidth of radar receiver, the CIF algorithm proposed in this paper is used to decompose the beat signal of radar into the intrinsic mode functions (IMFs) domain, and the energy distribution position of interference signal is obtained by the constant false alarm detection of each IMF. Furthermore, a method for eliminating the interference energy and reconstructing the amplitude and phase of target echo is designed. The proposed interference suppression approach is verified by the simulation and measured data. The results show that the proposed approach has a suppression effect of the signals with co-frequency and noncoherent frequency modulation at signal-to-interference-plus-noise-ratio of less than 20dB.

Key words: frequency modulation continuous wave, co-frequency interference, interference suppression, complex iterative filtering, intrinsic mode function

中图分类号:

TN957.51

陈齐乐, 杨瑾, 乔彩霞, 张睿恒. 基于复迭代滤波的连续波调频雷达同频非相参调频干扰抑制方法[J]. 兵工学报, 2024, 45(12): 4589-4596.

CHEN Qile, YANG Jin, QAO Caixia, ZHANG Ruiheng. Interference Suppression Approach for FMCW Radar Based on Complex Iterative Filtering[J]. Acta Armamentarii, 2024, 45(12): 4589-4596.

图/表 14

图1 干扰作用下输出差频

Fig.1 Beat signal under interference

图2 干扰抑制方法总体方案

Fig.2 Scheme of interference suppression method

图3 方法伪代码

Fig.3 Pseudocode ofinterference suppression and signal reconstruction method

表1 仿真参数

Table 1 Simulation parameters

参数	数值
载波频率/GHz	10
调制周期/μs	30
调制带宽/MHz	100
带通滤波器频带/MHz	1~45
雷达探测范围/m	10~2000
ADC速率/MHz	90

图4 干扰作用下差频信号的时域和频域

Fig.4 Time domain and frequency domain of beat signal under interference

图5 差频信号的IMF和希尔伯特谱

Fig.5 IMFs and the Hilbert spectrum of beat signal

图6 干扰抑制方法仿真结果

Fig.6 Simulated results of interference suppression

图7 干扰抑制后的差频信号仿真结果

Fig.7 Beat signal after interference suppression

图8 SINR=-23dB时不同抗干扰方法下雷达测距结果

Fig.8 Ranging results with different interference suppression methods for SINR=-23dB

图9 不同信干噪比条件下方法干扰抑制效果

Fig.9 Interferencesuppression effects of the proposed method under different SINRs

表2 运行时间

Table 2 Computational time s

方法	数值
本文方法	0.0194
ANC方法	0.0030
自适应滤波方法	0.3848
EMD是方法	0.6241

图10 实测场景

Fig.10 Measured scene

图11 干扰下差频信号时域图

Fig.11 Time domain diagram ofbeat signal under swept frequency jamming

图12 测距结果对比

Fig.12 Comparison of ranging results

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