Source depth discrimination using wavenumber domain feature with a horizontal array

Peng, Li; Zhang, Xin Hua; Li, Lan Rui; Zhang, Wen Long

doi:10.1016/j.apacoust.2020.107287

Cited by 4 publications

(1 citation statement)

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“…Severe challenges were posed towards deploying scheme designs and signal processing on account of that the underwater acoustic channel is variable and highly dependent on environmental factors, such as temperature, pressure, or salinity of the water column [7][8][9]. Plenty of bearing estimation methods have been developed to collect directional information about these sources [10,11]. These methods are all based on the plane-wave hypothesis, and conventional weighting was conducted in beamforming, which resulted in a deviated bearing estimation due to the multimode mechanism.…”

Section: Introductionmentioning

confidence: 99%

Direction-of-Arrival Estimation of Bottom-Mounted Horizontal Linear Array Based on the Weighted Phase Velocity

Zhang

Yang

2023

JMSE

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The direction-of-arrival (DOA) estimation of an underwater bottom-mounted horizontal linear array (HLA) based on weighted phase velocity has been proposed in this paper. The directional response is mainly affected by differences in the modal phase velocities and the sound speed of the water column. Based on the mode theory, the acoustic intensity distribution characteristics and beam deviation were analyzed. The beamforming result obtained provides a distinguishing feature of bearing deviation when the measured sound speed was used. By applying the modal weighted phase velocity instead, source bearing can be well estimated. Particularly, in the presence of a thermocline, the propagating modes can be selected on the basis of the mode trapping theory. Both surface and submerged sources were taken into account based on the experimental data, and the deviation was well explained and reduced. For a source near the end-fire direction, the bearing estimation error was reduced from several degrees to tenths of degrees.

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