2025_programme: A Two-Dimensional Line Spectrum Detection Method for Underwater Targets Based on Frequency-Azimuth Spectra from Adaptive Beamforming

• Day: June 17, Tuesday
    Location / Time: B. ERATO at 18:00-18:20
• Last minutes changes: -
• Session: 28. Signal and Image Processing
  Organiser(s): N/A
  Chairperson(s): Gabriele Morra
• Lecture: A Two-Dimensional Line Spectrum Detection Method for Underwater Targets Based on Frequency-Azimuth Spectra from Adaptive Beamforming
  Paper ID: 2284
  Author(s): Xuedong Zhang, Shaoqiang Wang, Yiming Gu, Jianli Huang
  Presenter: Xuedong Zhang
  Abstract: Array signal beamforming-based line spectrum detection techniques are widely used in underwater target line spectrum detection due to their ability to effectively extract target characteristic signals in noisy environments. However, traditional line spectrum detection methods typically first perform conventional beamforming on the array received signals in the spatial domain to obtain the target’s azimuth, and then conduct line spectrum detection on the beamformed signals in the time domain at the target’s azimuth. This approach is highly dependent on the accuracy of azimuth estimation, which can be problematic for detecting weak targets in practical applications. To address this issue, this paper proposes a two-dimensional line spectrum detection method based on frequency-azimuth spectra from adaptive beamforming. The proposed method independently performs threshold detection on the frequency-azimuth spectrum, obtained after adaptive beamforming, along the frequency and azimuth dimensions, respectively, to obtain preliminary candidate line spectra. Then, the final line spectrum detection results are determined by taking the intersection of the candidate line spectra across different frequencies and azimuths, respectively, obtained from the previous step. Unlike traditional methods, this approach simultaneously obtains both the frequency and azimuth information of the target's line spectrum, reducing the reliance on azimuth estimation accuracy, and significantly decreasing the false alarm probability in weak target line spectrum detection. Experimental results demonstrate the promising application potential of this method in underwater weak target line spectrum detection.
• Corresponding author: Dr Xuedong Zhang
  Affiliation: Institute of Acoustics, Chinese Academy of Sciences
  Country: China