Journal of Marine Science and Engineering (Nov 2023)

Striation-Based Beamforming with Two-Dimensional Filtering for Suppressing Tonal Interference

  • Pingzheng Li,
  • Yanqun Wu,
  • Wei Guo,
  • Chunyan Cao,
  • Yanxin Ma,
  • Lifan Li,
  • Hongze Leng,
  • Aolong Zhou,
  • Junqiang Song

DOI
https://doi.org/10.3390/jmse11112117
Journal volume & issue
Vol. 11, no. 11
p. 2117

Abstract

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Based on the interference spectrogram in the element–frequency domain using the data measured by the horizontal linear array, the source range can be estimated through the striation-based beamforming (SBF) method and its variants. Estimation of the striation slope is the basis for these ranging methods. But in practical scenarios, the tonal interferences and other noise make it difficult to estimate the slope. In this paper, we proposed a two-dimensional low-pass filtering method after the two-dimensional discrete Fourier transform (2D-DFT) of the element–frequency domain spectrogram. The signals can be separated from the interference and noise using this filter. For the linear frequency-modulated signal without a known waveform, we also proposed an extraction and phase compensation method based on the time–frequency spectrogram, and the acoustic data obtained can be used for source ranging. The experimental results indicate that the methods proposed are feasible.

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