基于FRFT的频域自适应匹配滤波器检测方法  

Frequency domain adaptive matching filter detection method based on FRFT

作　　者：梁琴 胡鹏鹏 陈洲 李捷[1] LIANG Qin;HU Peng-peng;CHEN Zhou;LI Jie(Sichuan Jiuzhou Electric Group Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]四川九洲电器集团有限责任公司,四川成都610000

出　　处：《舰船科学技术》2024年第5期69-73,共5页Ship Science and Technology

基　　金：装备预研基金项目(6140415031)。

摘　　要：针对浅海混响背景下频域自适应匹配滤波器检测性能下降的问题,提出基于分数阶傅里叶变换(FRFT)的频域自适应匹配滤波器检测方法,该方法利用模板匹配技术,采用滑动窗对接收信号进行最优阶次分数阶傅里叶变换,然后将此过程中得到的FRFT域图与参考信号最优阶次傅里叶变换FRFT域图进行匹配,将离差平方和作为评价相似度的指标,即对离差平方和最小值的位置进行滤波,并对滤波后的信号进行最优阶次分数阶傅里叶逆变换,从而实现混响背景下的目标检测。仿真结果表明,在信混比为-15dB的情况下,该算法可显著提高频域自适应匹配滤波器的检测性能。To solve the problem of the degradation of the detection performance of the frequency domain adaptive matching filter in shallow sea reverberation background,a frequency domain adaptive matching filter detection method based on fractional Fourier transform(FRFT)is proposed.The method uses template matching technology and sliding window to perform the optimal fractional Fourier transform on the received signal.Then,the FRFT domain map obtained in this pro-cess is matched with the FRFT domain map of the reference signal with the optimal order Fourier transform,and the sum of the squares of deviation is used as the index to evaluate the similarity,that is,the position of the minimum sum of the squares of deviation is filtered,and the optimal order fractional inverse Fourier transform is carried out on the filtered signal,so as to realize the target detection under the reverberation background.Simulation results show that the proposed algorithm can sig-nificantly improve the detection performance of the frequency-domain adaptive matching filter when the signal-mixing ratio is-15dB.

关 键 词：混响抑制 分数阶傅里叶变换 频域自适应匹配滤波器 信号检测 

分 类 号：U676.61[交通运输工程—船舶及航道工程]