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  • AIRCRAFT COMMUNICATIONS AND NAVIGATION  (2)
  • AIR TRANSPORTATION AND SAFETY  (1)
  • 1
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    Development and flight test of a weather radar precision approach concept (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: In order to make full use of the helicopter's unique capability of remote-site, off-airport landings, it would be desirable to employ a self-contained navigation system requiring minimum groundable-based equipment. For this reason, research is being conducted with the aim to develop the use of airborne weather radar as a primary navigation aid for helicopter approach and landing in instrument flight rules (IFR) conditions. Anderson et al. (1982) have reported about the first phase of this effort, taking into account the detection of passive ground-based corner reflectors with the aid of an 'echo processor'. The technology of passive-reflector detection in the overland environment provides the pilot with the range and bearing to the landing site. The present investigation is concerned with a second research phase, which was undertaken with the objective to develop and demonstrate the feasibility of a weather radar-based precision approach concept. Preliminary flight test results are considered.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Flight tests of IFR landing approach systems for helicopters (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Joint NASA/FAA helicopter flight tests were conducted to investigate airborne radar approaches (ARA) and microwave landing system (MLS) approaches. Flight-test results were utilized to prove NASA with a data base to be used as a performance measure for advanced guidance and navigation concepts, and to provide FAA with data for establishment of TERPS criteria. The first flight-test investigation consisted of helicopter IFR approaches to offshore oil rigs in the Gulf of Mexico, using weather/mapping radar, operational pilots, and a Bell 212 helicopter. The second flight-test investigation consisted of IFR MLS approaches at Crows Landing (near Ames Research Center), with a Bell UH-1H helicopter, using NASA, FAA, and operational industry pilots. Tests are described and results discussed.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA. Langley Research Center The 1980 Aircraft Safety and Operating Probl., Pt. 1; p 145-164
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Demonstration of radar reflector detection and ground clutter suppression using airborne weather and mapping radar (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A navigation system which utilizes minimum ground-based equipment is especially advantageous to helicopters, which can make off-airport landings. Research has been conducted in the use of weather and mapping radar to detect large radar reflectors overland for navigation purposes. As initial studies have not been successful, investigations were conducted regarding a new concept for the detection of ground-based radar reflectors and eliminating ground clutter, using a device called an echo processor (EP). A description is presented of the problems associated with detecting radar reflectors overland, taking into account the EP concept and the results of ground- and flight-test investigations. The echo processor concept was successfully demonstrated in detecting radar reflectors overland in a high-clutter environment. A radar reflector target size of 55 dBsm was found to be adequate for detection in an urban environment.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: Annual Forum; May 04, 1982 - May 07, 1982; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
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