Anti-frequency sweeping jamming method for linear frequency modulated fuze based on CFAR detection
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摘要:
针对线性调频引信受扫频式干扰后易出现的“早炸”和“瞎火”问题，提出了一种恒虚警率(CFAR)检测与Burg外推法结合的干扰剔除与信号重构方法。该方法根据线性调频引信目标回波差频信号同干扰差频信号在时频域平面的分布差异，利用CFAR检测干扰差频信号的时频分布，并将干扰所在位置能量置零，从而剔除干扰对引信的影响；针对干扰置零法引起的目标回波信号部分片段丢失、信噪比下降等问题，提出了基于Burg外推法的信号重构方法，重构置零区间内的目标回波差频信号。通过仿真和实测验证了所提方法的性能，结果表明：所提方法可有效抑制线性调频引信差频信号中的干扰成分。
Abstract:In response to the problems of “premature explosion” and “misfire” caused by sweeping jamming in frequency modulated fuzes, a jamming elimination and signal reconstruction method combining constant false alarm rate (CFAR) detection and Burg extrapolation is proposed. To eliminate the impact of jamming on the fuzes, the technique uses a CFAR detector to detect the time-frequency distribution of the jamming and sets the signal energy of the jamming position to zero. This is based on the distribution differences between the target echo signal and the jamming of the beat signal in the time-frequency domain. A Burg extrapolation-based signal reconstruction technique is suggested to rebuild the target echo during the zeroing interval, aiming to address issues like partial fragment loss and the decrease in signal-to-noise ratio brought on by zeroing. The performance of the method is verified by simulation and actual measurement. The outcomes demonstrate that the anti-jamming method put forth in this research is capable of successfully suppressing sweep interference in the frequency modulated fuze beat signal.
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图 1 扫频干扰作用下调频引信差频信号
Figure 1. The beat signal of frequency modulated fuze affected by sweep jamming
图 3 受扫频干扰影响的差频信号时域波形
Figure 3. The waveform of the beat signal contaminated by sweep jamming in time domain
图 4 受扫频干扰影响的差频信号时频分布
Figure 4. Spectrogram of the beat signal contaminated by sweep jamming in time-frequency domain
图 6 基于CFAR-Burg抗干扰处理后差频信号的时频图谱
Figure 6. The time-frequency domain spectra of the beat signal after anti-jamming with CFAR-Burg
图 7 基于CFAR-Burg抗干扰处理后的时域恢复信号
Figure 7. The recovered beat signals in time domain after anti-jamming with the CFAR-Burg
图 10 不同信干噪比条件下不同方法抗干扰性能
Figure 10. Anti-jamming performance of various approach under different SINR
图 12 实验采集到的差频信号时域波形
Figure 12. The waveform of the beat signal in time domain collected in the experiment
图 15 基于CFAR-Burg抗干扰处理后实测差频信号的时频图谱
Figure 15. The time-frequency domain spectra of measured beat signal after anti-jamming with CFAR-Burg
图 16 基于CFAR-Burg抗干扰处理后的实测时域恢复信号
Figure 16. The measured recovered beat signals in time-frequency domain after anti-jamming with the CFAR-Burg
图 18 实测差频信号去干扰后的距离维检测结果
Figure 18. Detection results in distance domain of measured beat signal after interference mitigation
表 1 仿真参数
Table 1. Simulation parameters
参数 数值 中心频率/GHz 77 调制周期/μs 60 调制带宽/MHz 1798 扫频带宽/MHz 1798 干扰调制周期/μs 3000 信干噪比/dB −12 
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表 2 实验雷达系统参数设置
Table 2. Experimental radar parameter settings
参数 数值 中心频率/GHz 77 调制带宽/MHz 1798.92 调制斜率/(MHz·μs−1) 29.982 采样点数/(个·chrip−1) 256
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