The Formation of a Synthetic Aperture with Towed Hydrophones

Abstract

Passive-synthetic apertures were formed with experimental data from the coherent summation of subapertures formed from 1 to 4 hydrophone groups at successive time samples. The results show that the increase in coherent signal gain for synthetic apertures with lengths up to 95 lambda, when compared to the conventional result, was a function of the number of successive time samples (Nts) described by alpha 10 Log (Nts) with alpha approx. 0.7. The hydrophones were towed with a speed-to-wavelength ratio of 0.168 per sec at a dept of 26 lambda. A calibrated moored source was at a depth of 37 lambda in 3200 m of water at distance-to-wavelength ratios between 20,000 and 30,000 from the receiver.

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Document Details

Document Type
Technical Report
Publication Date
May 07, 1984
Accession Number
ADA146820

Entities

People

  • N. Yen
  • W. M. Carey

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustics
  • Classification
  • Detectors
  • Directional
  • Environment
  • Experimental Data
  • Frequency
  • Governments
  • High Resolution
  • Maximum Likelihood Estimation
  • Mississippi
  • Noise
  • Oceans
  • Plane Waves
  • Security
  • Time Intervals
  • Waves

Fields of Study

  • Physics

Readers

  • Analytical Mechanics
  • Image Processing and Computer Vision.
  • Oceanography.