Research On Key Technologies Of Target Cooperative Location Based On Distributed Acoustic Array

Passive acoustic detection and positioning technology detects the position of the target by receiving the sound signal radiated by the target.In view of the disadvantages of existing passive acoustic detection and positioning using a single acoustic array for target location,which has small coverage,poor reliability,and poor resolution when positioning multiple targets,a multi-node target coordinated localization method based on distributed acoustic array is proposed in this thesis.This method combined with passive acoustic detection and localization technology and wireless sensor network,researches around acoustic array design,distributed acquisition system and multi-node collaborative localization algorithm.This thesis first studies and derives the sound field model of the co-location system.Based on the array signal processing theory,the design and analysis of one-dimensional linear array and two-dimensional"L"-shaped array are completed,and on this basis completed the miniaturized design of the acoustic array.When there is only one broadband sound source,the overall size of the array can be reduced to 20.4cm.When there are multiple sound source targets,the overall size of the array is 40.8cm,which is a reduction rate compared to the traditional conventional array size can reach 80%.Subsequently,on the basis of the existing multiple signal classification algorithm,combined with particle filter theory,a multi-sensor array co-location algorithm based on PF-MUSIC is proposed,which realized the co-localization of the distributed acoustic array target.The simulation results showed that the multi-acoustic array The co-location error is one third of the localization error of a single acoustic array.In the hardware-in-the-loop simulation experiment of multi-acoustic array co-location,the positioning error of a single acoustic target within 10 m~2 is less than 10cm.Based on the above theoretical research,a prototype of the distributed acoustic array target co-location principle and the acquisition software design is completed in this thesis,which based on the acoustic sensor array,high-speed multi-channel synchronous data acquisition card and wireless transmission module.Design and carry out a single-node target positioning test experiment and a multi-node semi-physical collaborative target positioning experiment.The designed micro acoustic array,distributed acquisition hardware,and PF-MUSIC-based multi-sensor array collaborative positioning algorithm were tested.The experimental results verifies that the miniature acoustic array model and PF-MUSIC co-location algorithm proposed in this thesis are correct and feasible.