All-fiber acoustic-posture integrated towed linear array based on fiber laser hydrophone

The impact of attitude deformation of towed linear array and the fitting error of point attitude sensors on beamforming. We studied All-fiber acoustic-posture integrated towed linear array based on distributed feedback fiber laser (DFB-FL) hydrophone and optical frequency domain reflectometry (OFDR) distributed attitude measurement. Analyzed the principle of towed array direction finding, and the influence of towed array attitude deformation on directional error was analyzed. Designed an 8-element hydrophone towed linear array structure with a diameter of 16mm, effectively combining fiber laser hydrophones with attitude sensing multi-core optical fiber. Finally, the effectiveness of attitude correction was verified through static direction finding experiments in anechoic tank, and the accuracy of direction finding was better than 2° under the extreme "S-bend" shape conditions of the drag array attitude. It can effectively improve the accuracy of direction finding.