AN/SQS-26 Interference: 'Fathometer-Type' Bottom Returns

Abstract

In the various models of the AN/SQS-26 sonar, enough energy is transmitted and received via the vertical sidelobe response to allow these systems to receive discreet echoes from the ocean bottom. Such echoes are referred to as 'fathometer' returns because their arrival times relate directly to multiples of the water depth. Although the AN/SQS-26 receives incoherent bottom reverberation returning via this same path, this discussion treats only the coherent 'fathometer-type' returns. These returns are typically observed on the CW portion of the AN/SQS-26 storage display, and constitute regions of interference, the severity of which is a function of the water depth, the normal incidence bottom loss, and the specific SQS-26 equipment model. In this paper, the 'fathometer-type' of interference is discussed generally, and some specific AN/SQS-26 (BX) and AN/SQS-26 (AXR) results from test area Bravo (a one degree square centered at 25.5 deg N, 72.5 deg W) are presented.

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Document Details

Document Type
Technical Report
Publication Date
Dec 11, 1969
Accession Number
ADA066651

Entities

People

  • B. F. Cole
  • H. R. D'amelia

Organizations

  • Navy Underwater Sound Laboratory

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Active Sonar
  • Analyzers
  • Bottom Bounce
  • Bottom Loss
  • Convergence Zones (Sonar)
  • Depression
  • Depression Angles
  • Discrimination
  • Echo Ranging
  • Echoes
  • Frequency
  • Losses
  • Range Finding
  • Seabed
  • Sonar
  • Tank Guns
  • Wave Analyzers

Readers

  • Acoustical Oceanography.
  • Radar Systems Engineering.