Research And Implementation Of Acoustic Beacon Location Technology And Algorithm For Flight Data Recorder Based On AUV Platform

Underwater acoustic detection technology is one of the important technical means to search for aircraft crash at sea.How to effectively detect the aircraft black box acoustic beacon within its life cycle is the main problem to be solved urgently by the traditional acoustic search method,which is related to the probability of success of the search for aircraft crash.In order to solve this problem,this paper studies a target detection and positioning technology based on AUV platform of extensible boat body,which USES single,three and four primitives to locate the target,and then realizes the target search of black box by stages.In this paper,a phased target search scheme for black box is specifically proposed.Firstly,prefabricated route search is carried out,and single vector hydrophone is used for coarse direction finding to achieve coarse distance target orientation measurement.Secondly,close-in target detection is carried out,that is,using triangular array precision direction finding to complete accurate direction finding of near target in the process of close-in target.Finally,precise target positioning is carried out,that is,the extended wings are formed into a triangular pyramid array to achieve accurate target positioning of the black box.To solve the problem that the small platform is not suitable for installing the large aperture array,the paper proposes to use the single vector hydrophone and the extended positioning baseline for detection.First of all,because the vector hydrophone is small in size,small in mass and easy to be distributed,it is more conducive to meet the actual needs of small platform detection applications.The vector algorithm program is designed to estimate the target direction remotely through the sound pressure and vibration velocity cross-spectrum.Secondly,the simulation analysis of the extension positioning on the basis of the principle of geometric direction-finding baseline two stages in the triangle array,the performance of the triangular pyramid array,on the basis of the theory of coordinate conversion method is put forward,and realize the visual expression of the result of the numerical calculation of bearing measurement errors and analysis,at the same time,the triangular pyramid array localization algorithm is studied and the error analysis,especially the influence of time delay estimation on the positioning performance is analyzed,when the sampling frequency is 250 KHZ,are,and close up the target positioning combined with interpolation method to achieve black box positioning solution.In this paper,the processing of the test data on the lake has preliminarily verified the technical index requirements of the detection slope distance up to 1500 m.In this paper,the research on the phased search technology of black box provides a new and effective technical approach for the efficient search of black box.