Digital Design Method of Passive Acoustic Zero-Crossing Detection System

The traditional passive acoustic detection system has a long design cycle and a large cost of experimental improvement, which is difficult to meet the rapid development and iteration requirements of complex electronic systems. In this paper, the passive acoustic zero-crossing detection system is gradually decomposed into functional modules by using the top-down digital design method, and the functional modules are digitally modeled respectively. According to the requirements of the system design index, the digital prototype of the passive acoustic zero-crossing detection system is designed by using the established digital function module model. The function of each module is verified by single frequency signal. The parameters such as false alarm probability and anti-locking time are simulated iteratively by using the actual measured signal. The reasonable system parameters are optimized and the digital prototype is verified. The results show that the designed digital prototype can accurately detect the target, and the physical prototype design of the passive acoustic zero-crossing detection system can be carried out accordingly.