Utility of Helicopter Rotor Reflections at HF

Abstract

Recent over-the-horizon (0TH) surveillance exercises conducted by the Naval Research Laboratory in cooperation with air and surface units of the U.S. Fleet have permitted the opportunity for detection and characterization of the rotor modulations of the SH-3D helicopter. The uniqueness of the radar signature of the SH-3D rotor blade affords adequate discrimination in an environment of multiple conventional aircraft. Such echoes have been obtained from the SH-3D at line-of-sight ranges and at approximately 870 and 2070 nautical miles from the radar. Though no extensive detection statistic has yet been accumulated, use of a ship's own helicopter for locating the ship's position within the 0TH-sensor envelope has been tentatively demonstrated, as disclosed in this report.

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Document Details

Document Type
Technical Report
Publication Date
Dec 29, 1972
Accession Number
ADA472251

Entities

People

  • Derrill C. Rohlfs
  • Frank H. Utley
  • James T. Ferrell
  • William C. Headrick

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Ammunition
  • Amphibious Operations
  • Cargo Ships
  • Commercial Aircraft
  • Detection
  • Flight Decks
  • Helicopter Rotors
  • Helicopters
  • Military Research
  • Naval Air Stations
  • Radial Velocity
  • Time Intervals
  • Utility Aircraft
  • Warfare

Readers

  • Aerodynamics.
  • Radar Systems Engineering.
  • Theoretical Analysis.