Array Shape Determination with a Real-Time Model

Abstract

A shape estimation scheme based on precomputed frequency-domain solutions of array motion is presented. The boundary conditions supporting each solution are discrete Fourier transform (DFT) components of sensor measurements, which are updated in real time. A prediction of array shape in the time domain is obtained by performing an inverse DFT on the set of frequency-domain solutions. Extensions to the method include the use of slope inputs instead of displacements as well as inclusion of an arbitrary number of inputs to minimize the effect of measurement error. A comparison of the results with data shows good agreement, and CPU time is an order of magnitude faster than real time on the VAX 8800 (with an update rate of 0.74 sec).

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1991
Accession Number
AD1113546

Entities

People

  • A. A. Ruffa

Organizations

  • Naval Undersea Warfare Center
  • SACLANT ASW Research Centre

Tags

DTIC Thesaurus Topics

  • Arrays
  • Axial Flow
  • Boundaries
  • Computational Fluid Dynamics
  • Computational Science
  • Computations
  • Differential Equations
  • Discrete Fourier Transforms
  • Displacement
  • Dynamics
  • Equations
  • Fluid Mechanics
  • Frequency
  • Frequency Domain
  • Mechanics
  • Partial Differential Equations
  • Time Domain
  • Towed Arrays
  • Undersea Warfare
  • Warfare

Fields of Study

  • Engineering

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Calculus or Mathematical Analysis
  • Parallel and Distributed Computing.