Acoustic vortex communication transceiving array calibration method based on orbital angular momentum spectrum decomposition

Abstract

According to a transceiving array calibration method based on the OAM spectrum standard deviation, OAM communication of vortex acoustic beams is achieved through a single-ring transceiving array on the basis of the multiplexing vortex acoustic beam phase control theory, and orbital angular momentum spectrums of multiplexing vortex acoustic beams under ideal and non-ideal conditions are obtained, the orbital angular momentum diffusivity of the multiplexing vortex sound beam under the non-ideal condition is evaluated according to the relative error of the normalization results of the transmitting array and the receiving array, and the relative position calibration of the transmitting array and the receiving array is completed by only calibrating the transverse offset and the relative deflection of the receiving array in sequence and simultaneously calibrating the relative deflection of the transmitting array and the receiving array, and coaxial transmission of the multiplexing vortex acoustic beam is realized. According to the method, calibration of transverse translation and relative deflection between the transmitting array and the receiving array in acoustic vortex communication can be realized, ideal vortex acoustic beam communication conditions are established, orbital angular momentum diffusion is effectively reduced, communication quality is improved, and the method is of great significance to development and application of the vortex acoustic beam communication technology.

Description

Technical field: [0001] The invention relates to the field of acoustic vortex communication in acoustic communication applications, in particular to a method for calibrating a transceiver array of acoustic vortex communication based on orbital angular momentum spectrum decomposition. [0002] technical background: [0003] In the context of globalization, communication has become one of the lifelines of contemporary society, playing a vital role in economic, political, cultural and other fields, and can fully reflect the comprehensive strength of a country. With the rapid development of science and technology, all kinds of information are showing an explosive growth trend. The traditional communication methods based on wave propagation characteristics such as frequency, phase, and amplitude have gradually failed to meet the needs of social development. For this reason, the researchers proposed to use the helical phase distribution of the vortex beam to improve the spectrum ut...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the non-ideal receiving conditions in the acoustic vortex communication easily affect the orthogonality of the orbital angular momentum in the vortex acoustic beam, form the orbital angular momentum diffusion, and reduce the communication quality. Transceiver array calibration technology based on momentum spectrum decomposition, using the monotonous change trend of the orbital angular momentum spread with the lateral offset and relative deflection between the transmitting and receiving arrays to calibrate the relative positions of the transmitting and receiving arrays, so as to realize the multiplexing of vortex acoustic beams The coaxial parallel transmission reduces the diffusion of orbital angular momentum in communication, thereby improving the quality of acoustic vortex communication

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