Passive Detection of Undersea Vehicle Acoustic Fuze Based on Energy Variation

Aiming at the problem of real-time and effective detection of an acoustic fuze at the end of the intersection between an undersea vehicle and a moving target, a passive detection of acoustic fuze for undersea vehicles was presented, which used the fast-changing energy characteristics of the received noise radiated by target. The noise received by the undersea vehicle acoustic fuze was converted using the fast Fourier transform(FFT), and the energy of the noise in the working frequency band was calculated to obtain the signal energy changing curve. Finally, the energy curve was smoothed by the designed filter, and the slope of the curve was calculated. The results of the simulation and processing of the measured data showed that the slope of the signal energy curve can effectively reflect the energy change characteristics of the noise received by the acoustic fuze in the intersection process between the undersea vehicle and moving target, and the slope of the signal energy curve can be used as an important criterion for the shortest distance between the undersea vehicle and moving target and the best time for acoustic fuze to give out an action signal.