Sidelobe suppression method suitable for orbital angular momentum three-dimensional imaging sonar

Abstract

The invention relates to a sidelobe suppression method suitable for an orbital angular momentum three-dimensional imaging sonar, and the method is characterized in that the method comprises the stepsof: carrying out weighted summation on echo signals of orbital angular momentum vortex sound waves at different orders to obtain a wave beam of a vortex wave; according to the wave beam of the vortexwave, constructing a set S of points of the orientation of the sidelobe height; processing the set S of the points of the orientation of the sidelobe height to obtain an optimized weighted vector; using the optimized weighted vector to carry out first beam forming on the signal received by a receiving hydrophone; and performing weighted summation on the data obtained in the step 4 to obtain secondbeam forming, and traversing different spatial orientations to obtain a final beam pattern. According to the method, the weighted vector of beam forming is optimized, so that the first beam forming forms a recess in the orientation of the sidelobe height of the second beam, the sidelobe level of the orbital angular momentum three-dimensional imaging sonar is reduced, and the purpose of inhibitingthe sidelobe of the final beam is achieved.

Description

technical field [0001] The invention belongs to the technical field of marine acoustic equipment, and relates to a sidelobe suppression method, in particular to a sidelobe suppression method suitable for orbital angular momentum three-dimensional imaging sonar. Background technique [0002] With the development of marine technology, people pay more and more attention to the research of vortex sound wave. The vortex sound wave has a spiral wavefront phase, which can modulate the spatial information and improve the information transmission and acquisition ability of the sound wave. Therefore, the use of orbital angular momentum vortex acoustic waves as the phased array three-dimensional imaging sonar for transmitting signals can not only improve the imaging accuracy, but also greatly reduce the number of hydrophones required to receive the array. However, the sparse nature of the receiving array will increase the sidelobe level of the receiving array beam. For example, the or...

AI Technical Summary

Problems solved by technology

However, the sparse nature of the receiving array will increase the sidelobe level of the receiving array beam. For example, the orbital angular momentum three-dimensional imaging sonar using a receiving array with 64 array elements has a sidelobe level of only -9.8dB

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