Undersea Sound Speed and Range Estimation

Abstract

Estimation of an acoustic wave velocity in the ocean and its utilization to improve object localization are studied here. Time delay and/or Doppler shift are measured by the vertically deployed sensors in two-dimensional systems. Various sensor configurations (up to three sensors) are considered. The information rate grows very fast when the measurement equation includes Doppler shift (1DIP, 2DIP). The system is totally unobservable with one sensor (1D), but the system is observable when two or three are employed. Three-sensor, two- delay, one Doppler (2DIP) measurement gives the strongest observability. Several variations of Extended Kalman Filter (EKF) algorithms are tried. Approximated expression of the measurement equation with three sensors (2DIP) shows the best velocity, target range is compared with nonestimated case. As the measurement noise level increases, tracking performance of the estimated case becomes superior to the nonestimated case.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1983
Accession Number
ADA138954

Entities

People

  • C. S. Hwang
  • R. R. Mohler

Organizations

  • Oregon State University

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Velocity
  • Acoustic Waves
  • Algorithms
  • Carrier Frequencies
  • Coordinate Systems
  • Covariance
  • Doppler Effect
  • Eigenvalues
  • Engineering
  • Equations
  • Filters
  • Filtration
  • Kalman Filters
  • Simulations
  • Two Dimensional
  • Wave Propagation
  • Waves

Readers

  • Acoustical Oceanography.
  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Fluid Dynamics.