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Underwater Acoustic Time Delay Estimation Based on Envelope Differences of Correlation Functions.

Guodong Li1,2, Jinsong Wu3, Taolin Tang4,5

  • 1Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, China. liguodong@fmiri.ac.cn.

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This study introduces an improved underwater acoustic time delay estimation method using envelope differences of correlation functions (EDCF). This technique enhances accuracy by reducing errors from amplitude fluctuations in traditional correlation methods.

Keywords:
correlation methodenvelope differences of correlation functionstime delay estimationunderwater acoustic localization

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Area of Science:

  • Acoustic signal processing
  • Underwater communication

Background:

  • Traditional correlation methods (CM) for time delay estimation suffer from errors due to amplitude fluctuations in correlation function envelopes.
  • Accurate time delay estimation is crucial for underwater acoustic systems.

Purpose of the Study:

  • To propose a novel underwater acoustic time delay estimation method that mitigates errors caused by amplitude fluctuations.
  • To analyze the performance of the proposed method and determine optimal parameters.
  • To develop a low-complexity, high-accuracy digital time delay estimation approach for underwater multipath channels.

Main Methods:

  • Envelope Differences of Correlation Functions (EDCF) for time delay estimation.
  • Analysis of method performance with varying time differences.
  • Development of a digital time delay estimation approach addressing sampling interval influences.
  • Performance evaluation in simulated underwater multipath environments.

Main Results:

  • The EDCF method effectively reduces delay estimation errors compared to CM.
  • Optimal difference time values were identified for improved performance.
  • The proposed digital approach offers low complexity and high accuracy.
  • Experimental validation confirmed the method's accuracy in underwater acoustic scenarios.

Conclusions:

  • The EDCF method provides a robust solution for underwater acoustic time delay estimation, overcoming limitations of traditional approaches.
  • The developed digital method is suitable for practical implementation in underwater acoustic systems, offering both accuracy and efficiency.