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Volume 27 Issue 4
 
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Article Navigation >  Journal of Unmanned Undersea Systems  > 2019  >  27(4): 392-397
DU Jin-xiang, XU Heng-bo. Wideband Acoustic Imaging of Underwater Target Using Spatial Time-Frequency Analysis[J]. Journal of Unmanned Undersea Systems, 2019, 27(4): 392-397. doi: 10.11993/j.issn.2096-3920.2019.04.005
Citation: DU Jin-xiang, XU Heng-bo. Wideband Acoustic Imaging of Underwater Target Using Spatial Time-Frequency Analysis[J]. Journal of Unmanned Undersea Systems, 2019, 27(4): 392-397. doi: 10.11993/j.issn.2096-3920.2019.04.005
shu

Wideband Acoustic Imaging of Underwater Target Using Spatial Time-Frequency Analysis

doi: 10.11993/j.issn.2096-3920.2019.04.005

  • School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China

  • Received Date: 2018-11-22
  • Rev Recd Date: 2019-01-07
  • Publish Date: 2019-08-31
    Abstract
  • Wideband acoustic imaging for moving target needs a large amount of computation because the scan is conducted in both range dimension and time scale dimension. On the other aspect, the waveforms with Doppler tolerance for underwater target detection have low resolution in time scale dimension, which leads to poor speed estimation, as a result, the range error during the acoustic imaging cannot be eliminated effectively and the image will be distorted. To solve these two problems, positive and negative frequency modulation(FM) pulses strategy is utilized in acoustic imaging of underwater target, and the spatial time-frequency analysis, which combines beamforming in spatial domain with wideband cross-correlation in time-frequency domain, is used to analyze the echo signals. Better speed estimation can be achieved without need for scanning in time scale dimension, so the computational load is decreased and better range migration correction performance is obtained. The better performance of the positive and negative FM pulses strategy is verified by simulation results of moving target with multiple highlights.

     

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