Global Broadcast Service (GBS) Blockage Assessment for USS Coronado (AGF-11)

Abstract

This report examines the impact of USS Coronado's two Global Broadcast Service (GBS) topside antenna locations on the availability of broadcast services. Blockage in the present locations limits global average line-of-sight availability (GALA) to 83.7% in calm seas, and to 78.3% and 68.2% in Sea States 4 and 6, respectively. However, the local average line-of-sight availability (LALA) for these topside locations drops to -50% in large regions in the ship's area of responsibility (AOR) and to -10% in areas around the subsatellite point. Moving one or both of the antennas to alternative locations can improve these results. This report also presents GALA and LALA results for a pro- posed new pair of antenna locations for which the LALA never drops below 81.4% at any point in the field-of-regard of the UHF Follow-On (UFO)/GBS satellites for Sea State 6. Since associated topside electromagnetic compatibility (EMC) studies have been completed with positive results, we recommend that Coronado's GBS antennas be moved to these new positions.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2000
Accession Number
ADA385289

Entities

People

  • G. B. Fitzgerald
  • R. A. Axford Jr.

Organizations

  • Naval Information Warfare Systems Command

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Artificial Satellites
  • Automatic Frequency Control
  • Availability
  • Calibration
  • Electromagnetic Compatibility
  • Electronic Mail
  • Line Of Sight
  • Measurement
  • Naval Warfare
  • Navy
  • Plastic Explosives
  • Satellite Constellations
  • Second World War
  • Ships
  • Spacecraft
  • Warfare

Readers

  • Naval Architecture and Marine Engineering.
  • Tactical Satellite Communications Systems Engineering.

Technology Areas

  • Space