Surface Craft Motion Parameter Estimation Using Multipath Delay Measurements from Hydrophones

Abstract

An equation-error (EE) method is described for estimating the three motion parameters of a watercraft (sound source) moving on the sea surface at a constant speed in a constant direction as it transits past a hydrophone located above the sea floor in a shallow water environment, using multipath delay measurements from the hydrophone. The motion parameter estimates are obtained via a linear least-squares (LLS) minimization followed by an algebraic transformation. A weighting matrix is derived for the LLS minimization to reduce the error variances of the motion parameter estimates. Computer simulation results show that the error variances approach the Cramer-Rao lower bounds for small multipath delay measurement errors. The effectiveness of the EE method is demonstrated using real hydrophone data. A method is then described for estimating the linear trajectory of the transiting source using the motion parameter estimates from the individual hydrophones of an underwater acoustic sensor network.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2011
Accession Number
ADA563196

Entities

People

  • Brian G. Ferguson
  • Kam W. Lo

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Detectors
  • Computer Simulations
  • Computers
  • Detectors
  • Equations
  • Hydrophones
  • Information Processing
  • Measurement
  • Power Spectra
  • Seabed
  • Sensor Networks
  • Shallow Water
  • Simulations
  • Slant Range
  • Standards
  • Trajectories
  • Water

Fields of Study

  • Engineering

Readers

  • Acoustical Oceanography.
  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Radar Systems Engineering.