Research On Acoustic Beacon Direction Positioning Based On 16-element Linear Array

In recent years,aircraft accidents have occurred frequently all over the world.Along with the normalization and actualization of the military training of our army,the maritime training tasks of the air force becomes more and more onerous.With the mission area is moving forward to the deep sea,the probability of aircraft accidents is increasing accordingly.When flights crash in the ocean,lakes and other open water areas,searching and salvaging the flight data recorder(aircraft black box)is a necessary way for accident analysis and investigation.To meet the TSO121A/B standard,the flight data recorder(aircraft black box)is equipped with the underwater acoustic beacon.Searching for the underwater acoustic beacon signal is the most effective way to locate the aircraft black box on the sea.The Malaysia Airlines “MH370” accident shows that China is insufficient in deep-sea acoustic signal locating techniques and equipment with deep,far,wide,fast and accurate performance.It is very difficult to search and locate the acoustic beacon under deep sea conditions.After the Malaysia Airlines “MH370” accident,the author participated in a research project called “The technology and equipment for deep sea acoustic beacon searching and locating”(2014BAB05),which is part of the national science and technology support program “The key technology developments and applications of the deep sea distress target search and emergency disposal”.This thesis mainly solves the direction-finding and locating problems of acoustic beacons based on a 16-element array.Firstly,on the basis of the existing mature horizontal linear array direction-finding technology,the uniformity and consistency of linear array output can be achieved through the calibration and compensation of the array elements.Then,the high precision direction-finding and locating the deep-sea acoustic beacon signal can be realized by array beamforming processing.In order to verify the effectiveness of the proposed algorithm,MATLAB programming is adopted to simulate the algorithm.And the splitting array beamforming algorithm in frequency domain is designed and implemented based on TMS320C6678 8-core DSP.Finally,the testing experiment is carried out in the pool,and the results meet the overall design requirements.This thesis solved some key technical problems for deep sea acoustic beacon searching and locating,which may improve the corresponding abilities of our country and realize the deep sea towed acoustic searching and locating system for military and civil uses eventually.