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  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (2)
  • AIR TRANSPORTATION AND SAFETY  (1)
  • 1
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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
  • 2
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    Design considerations for a real-time ocular counterroll instrument (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A real-time algorithm for measuring three-dimensional movement of the human eye, especially torsional movement, is presented. As its input, the system uses images of the eyeball taken at video rate. The amount of horizontal and vertical movement is extracted using a pupil tracking technique. The torsional movement is then measured by computing the discrete cross-correlation function between the circular samples of successive images of the iris patterns and searching for the position of the peak of the function. A local least square interpolation around the peak of the cross-correlation function is used to produce nearly unbiased estimates of torsion angle with accuracy of about 3-4 arcmin. Accuracies of better than 0.03 deg are achievable in torsional measurement with SNR higher than 36 dB. Horizontal and vertical rotations of up to + or - 13 deg can occur simultaneously with torsion without introducing any appreciable error in the counterrolling measurement process.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: IEEE Transactions on Biomedical Engineering (ISSN 0018-9294); BME-30; May 1983
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The detection and analysis of point processes in biological signals (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A pragmatic approach to the detection and analysis of discrete events in biomedical signals is taken. Examples from both clinical and basic research are provided. Introductory sections discuss not only discrete events which are easily extracted from recordings by conventional threshold detectors but also events embedded in other information carrying signals. The primary considerations are factors governing event-time resolution and the effects limits to this resolution have on the subsequent analysis of the underlying process. The analysis portion describes tests for qualifying the records as stationary point processes and procedures for providing meaningful information about the biological signals under investigation. All of these procedures are designed to be implemented on laboratory computers of modest computational capacity.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: IEEE; vol. 65
    Format: text
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    NASA TECHNICAL REPORTS
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