一种基于三谱线插值FFT的杂波抑制方法  

Clutter Suppression Method Based on Triple-Spectrum-Line Interpolation FFT

作　　者：王冬华 陈少华[2] 邹成晓 夏东方 WANG Donghua;CHEN Shaohua;ZOU Chengxiao;XIA Dongfang(No.724 Research Institute of CSSC,Nanjing 211153,China;No.28 Research Institute of CETC,Nanjing 210007,China)

机构地区：[1]中国船舶集团有限公司第七二四研究所,江苏南京211153 [2]中国电子科技集团公司第二十八研究所,江苏南京210007

出　　处：《现代防御技术》2024年第6期80-87,共8页Modern Defence Technology

摘　　要：不同于传统的MTI/MTD算法,提出了一种基于三谱线插值FFT的杂波抑制方法。该方法先对回波信号进行时域加窗处理,抑制非同步采样和周期截断带来的频谱泄漏和栅栏效应,再进行傅里叶变换,采用三谱线插值估算每个距离单元上多个频率和幅度分量,并将估算结果与杂波速度阈值进行比较。若高于阈值,即判定当前频率分量对应的幅度值为目标幅度值,并输出多普勒速度信息;否则判定未检测到目标。通过仿真及试验验证了该方法的可行性和有效性。Different from the traditional moving target indicator(MTI)or moving target detection(MTD)algorithms,a clutter suppression method based on triple-spectrum-line interpolation fast Fourier transform(FFT)is proposed.The radar echoes are windowed in the time domain,which is to suppress the spectral leakage and fence effect caused by non-synchronous sampling and periodic truncation.The radar echoes are processed by Fourier transform and triple-spectrum-line interpolated,and the frequency and amplitude components in the same distance unit can be estimated.The estimated results are compared with the clutter velocity threshold,if the estimated results are higher than the threshold,the amplitude value corresponding to the current frequency component is judged to be the target amplitude value,and outputting the Doppler velocity information,otherwise the target is not detected.The feasibility and effectiveness of the method are verified by simulation and experiment.

关 键 词：频谱泄漏 栅栏效应 三谱线插值 快速傅里叶变换 杂波抑制 

分 类 号：TN957.51[电子电信—信号与信息处理] TJ0[电子电信—信息与通信工程]