Design Of Portable Gunshot Detection System Based On ZYNQ

In contemporary warfare,the effective detection of gunfire signals can provide an important basis for assessing enemy equipment and fire deployment,and can significantly improve battlefield situational awareness.As an important form of contemporary wars,local wars and regional conflicts mainly take cities as the main battlefields.However,due to the complex and harsh conditions of urban combat environment,optical,electromagnetic and other reconnaissance means cannot effectively detect targets.Under such conditions,the use of penetrating acoustic signals can avoid the influence of the above factors to a great extent,so as to achieve target detection in a variety of weather and environment,and complete the effective acquisition of battlefield information.However,the special characteristics of urban street warfare such as narrow combat space and strong interference limit the volume of gun detection equipment and the quality of gun signal,which leads to the difficulty of ordinary gun detection equipment to meet the needs of actual combat.In order to solve these problems,a portable gunshot detection system based on ZYNQ was designed.Firstly,the sound wave theory of gunfire is studied,and the technical index decomposition and sensor selection are completed through the corresponding calculation.Secondly,with ZYNQ series SOC chip as the core,the hardware framework is designed,which mainly includes multi-channel ICP sensor conditioning circuit,multi-channel data synchronous acquisition circuit and data transmission circuit.Thirdly,the extraction method of acoustic field characteristic parameters is studied,and sequential logic circuits such as multi-channel AD driver IP module,hardware extraction IP module of acoustic field characteristic parameters and data transmission link are designed by means of self-defined IP core.Software system based on AXI4-Stream protocol is built,and Linux operating system is customized based on hardware interface.Finally,the performance of the system is verified by experiments.The test results show that the hardware indexes of the portable gun detection system designed in this thesis meet the preset requirements.The total weight of the system is 2.6kg.The system can realize the simultaneous acquisition of multiple gun signals with a sampling rate of 100 KSPS,and the data acquisition error of the system is less than 2%.The MFCC feature extraction time for a frame of 512 gunshot data is shortened to 22.11μs.The system can provide strong technical support for the street fighting scene in the urban combat environment.