一种基于快速傅里叶变换反鱼雷鱼雷主动声引信回波检测方法

An FFT-Based Detection Method of Active Acoustic Fuse Echo for Anti-torpedo Torpedo

为了实现反鱼雷鱼雷(ATT)声引信在强混响背景下对回波信号的检测,利用反鱼雷鱼雷主动声引信目标回波信号与混响噪声之间的特性差异,基于多普勒频移这一特征量设计了基于快速傅里叶变换(FFT)的回波信号检测方法。在降低了接收机设备量的同时,实现了-50～50 kHz的频率搜索范围。最后,通过蒙特卡罗方法仿真分析了接收系统工作特性。研究结果表明,基于FFT的反鱼雷鱼雷主动声引信检测系统可以实现对强混响背景下目标回波的检测。当信噪比高于3 dB时,在虚警概率Pf=10-4下,检测系统检测概率达到0.999 5以上。

In order to detect acoustic fuse echo for anti-torpedo torpedo（ATT） in strong reverberation noise background,an echo signal detection method is put forward by using Doppler frequency feature on the basis of the characteristic differences between active acoustic fuse echo and reverberation of anti-torpedo torpedo.By using the proposed method,fewer receiving devices can search in the frequency scope from-50 kHz to 50 kHz.The operating characteristics of a receiver are simulated by Monte Carlo method.The results show that the echo signals can be detected by the FFT-based detection system of active acoustic fuse echo for ATT in strong reverberation noise background.And the detection probability is higher than 0.999 5 even if the false alarm probability is 10-4 when the SNR is higher than 3 dB.