UACE2017 Proceedings: Inversion of Ocean Environmental Parameters with Radiated Noises of an Autonomous Underwater Vehicle: At-sea Experimental Results

• Session:
  Ocean Acoustic Tomography - Various application and data
• Paper:
  Inversion of Ocean Environmental Parameters with Radiated Noises of an Autonomous Underwater Vehicle: At-sea Experimental Results
• Author(s):
  Wen Xu, Ming Zhang, Yuanxin Xu
• Abstract:
  In a previous paper [1], we reported the results of using the radiation noise of an Autonomous Underwater Vehicle (AUV) as the sound source to invert the range-independent SSP, together with the position and velocity of the AUV, and the water column depth. To incorporate source motion effects, the forward model based on the waveguide Doppler and normal mode theory was applied to compute the replica field, and to resolve the adjacent Doppler shifted frequencies, an analytical solution of the forward model and its simplified version were obtained for arbitrary signal integration intervals with a monochromatic source. Through simulation and lake experimental results the developed waveguide Doppler model was shown to be more effective compared with the model that does not consider the Doppler effect. In May 2014, the approach was further tested in a sea trial conducted in the area of Zhoushan Archipelago with water depth about 35m, which used a relatively large-size AUV as the moving source and a 16-element vertical line array for receiving. In this paper, the at-sea experimental results are presented. The results again show that the parameters of high field sensitivity are well estimated except those mutually-coupled which suffer from local optima. It is also observed that the mismatch in AUV trace leads to degraded matching between the measured acoustic field and the modelled one; however, owing to the clear signal tone of the AUV used, the field matching is slightly better compared to the lake test results in [1]. Extension of the current approach to range-dependent environments is also discussed.\n\nReferences\n[1] M. Zhang, W. Xu, and Y. Xu, “Inversion of the sound speed with radiated noise of an Autonomous Underwater Vehicle in shallow water waveguides,” IEEE Journal of Oceanic Engineering, vol. 41, no. 1, pp204-216, 2016.\n
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Contact details

• Contact person:
  Prof Wen Xu
• e-mail:
  
• Affiliation:
  Zhejiang University
• Country:
  China