Research And Software Implementation Of Vertical Array Target Detection Based On ARK-3500 Platform

The security of our oceans has become an important subject,and the target detection is one of the important components.Latest sonar system generally adopts the combination of multiple hydrophone to form hydrophone array,and using more efficient signal processing method to achieve the target detection.Because of the easy releasing,recycling and easy to the mass implementation,vertical array is now more widely used in the underwater acoustic engineering project.This thesis is based on an acoustic detection project,the project uses the fiber optic vertical array,the software platform is an ARK-3500 industrial control computer,the concrete content includes: software based on an ARK-3500 platform to build software framework and data receiving process;The target elevation Angle measurement based on phase shift beam-forming method;The time-domain beamforming method based on the method of fractional delay beam forming and the linear spectrum independent detection and extraction;The test results are uploaded with the upper computer communication.Thesis expounds the vertical array based on background of phase shift and time delay beamforming,modeling and simulation research.According to actual situation,in the case of low sampling rate,the beam output distortion happens,thesis further expounds the variety of fractional delay beamforming method and comparison of simulation results.Based on this,this paper further elaborated the common LOFAR spectrum analysis and DEMON spectrum analysis of the target detection process,and gave the thought process of the autonomous detection target algorithm.The last chapter of the thesis is mainly the software realization of target detection algorithm,on LINUX system platform,using C language,the software includes the multi-process technology software framework,target detection algorithm module,network communication module based on UDP protocol and RS232 serial module with communication module and the upper machine and gathering attitude sensor RS485 serial port module.Finally,the performance of the software is verified by outfield experiment,which can achieve the target detection and meet the requirements of the project.