Maximum-Likelihood Flow-Speed Estimation.

Abstract

The design formulae and theoretical performance of a maximum-likelihood estimator for towed-array flow-speed estimation are discussed. Under appropriate conditions, it is shown that a maximum-likelihood estimate of convection velocity (which is related to tow speed) is achieved by performing a cross correlation between the outputs of two streamwise-separated flush-mounted surface probe hydrophones. The estimate, then, is derived by seeking the time delay which maximizes the cross correlation. Conditions are examined consistent with achieving accurate speed determination to within a fraction of a knot. Fortuitously, the method derived has the property that, as speed is increased, both the level and bandwidth of the pressure signals increase, thus providing increased signal-to-noise ratio and more accurate time-delay information.

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Document Details

Document Type
Technical Report
Publication Date
May 24, 1977
Accession Number
ADA044681

Entities

People

  • F. L. Rees
  • S. Gardner

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Bandwidth
  • Boundary Layer
  • Convection
  • Cross Correlation
  • Data Science
  • Delay Lines
  • Detectors
  • Frequency
  • Measurement
  • Military Research
  • Parallel Computing
  • Parallel Processing
  • Physics Laboratories
  • Shift Registers
  • Towed Arrays
  • Two Dimensional

Readers

  • Acoustical Oceanography.
  • Marine Hydrodynamics
  • Statistical inference.