Effective Calculation Methods of Reference Sound Velocity in Shallow Sea Environment

Xin Li


The conventional underwater passive direction finding method estimates the target angle through beamforming. The reference sound velocity in horizontal linear array beamforming should use the phase velocity of sound propagation. In passive direction finding, because the target distance is unknown, there is a deviation between the reference sound velocity selected in the target angle estimation and the phase velocity, which affects the direction finding accuracy. In this paper, two methods for calculating the reference speed of sound are presented: the normal amplitude weighting method and the beamforming method. The numerical simulation results under shallow sea propagation condition show that the reference sound velocity calculated by the two methods has the same trend as the distance between target and array.


Reference Sound Velocity; Phase Velocity

Full Text:


Included Database


Anderson LA . Navstar GPS (Global Positioning System) Accuracy While Surveying Arrays of Deep Ocean Transponders[J]. navstar gps accuracy while surveying arrays of deep ocean transponders, 1985.

Gao RR. Research on Key Technologies of Underwater acoustic Positioning [D]. Chang 'an University,2018.

Gong ZX, Lin J, Guo LH. Shallow sea sound propagation phase velocity influence on the accuracy of direction finding [J]. Acta, 2002 (6): 492-496.

Wang YL. Theory and Algorithm of Spatial Spectrum Estimation [M]. Tsinghua University Press, 2004.

Li QH. Introduction to Sonar Signal Processing, Second Edition [M]. China Ocean Press,2000.

Zhang RH, Li FH. Beam-displacement ray-mode theory of sound propagation in shallow water[J].,1999,42(07):739-749.

DOI: https://doi.org/10.18686/esta.v9i4.267


  • There are currently no refbacks.

Copyright (c) 2023 Xin Li

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.