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Author: Edward B. Geisler Publisher: ISBN: Category : Markov processes Languages : en Pages : 50
Book Description
Analysis of remote tower forward scatter meter measurements of extinction coefficient collected at the Air Force Geophysics Laboratory Weather Test Facility at Otis AFB, Massachusetts demonstrated the accuracy of a remote tower slant visual range (SVR) system. This report describes the final phase of the development and evaluation of a tower SVR system in which the remote tower approach has been extended to include Category I operations. Tests give additional evidence that the runway visual range (RVR) measurements are often not representative of pilot visibility during approach and touchdown. An examination of three short range prediction techniques for forecast times of 2, 5, 10, 30 and 60 minutes revealed that the Equivalent Markov technique provides accurate and reliable forecasts of below-limit SVR conditions and yields slightly better results than the Markov and REEP techniques. (Author).
Author: Edward B. Geisler Publisher: ISBN: Category : Markov processes Languages : en Pages : 50
Book Description
Analysis of remote tower forward scatter meter measurements of extinction coefficient collected at the Air Force Geophysics Laboratory Weather Test Facility at Otis AFB, Massachusetts demonstrated the accuracy of a remote tower slant visual range (SVR) system. This report describes the final phase of the development and evaluation of a tower SVR system in which the remote tower approach has been extended to include Category I operations. Tests give additional evidence that the runway visual range (RVR) measurements are often not representative of pilot visibility during approach and touchdown. An examination of three short range prediction techniques for forecast times of 2, 5, 10, 30 and 60 minutes revealed that the Equivalent Markov technique provides accurate and reliable forecasts of below-limit SVR conditions and yields slightly better results than the Markov and REEP techniques. (Author).
Author: H. Albert Brown Publisher: ISBN: Category : Meteorological instruments Languages : en Pages : 48
Book Description
Wind data have been analyzed to produce frequencies of occurrence of slant wind shear with respect to surface wind speed, time of day, vertical temperature gradient and wind shear direction differences. Slant wind shear (SWS) is a measurement that more closely approximates the shear encountered by an aircraft on takeoff or landing. It is computed as the wind shear between a higher level wind (in this study, 60 m) and the surface separated by a horizontal distance equivalent to that which an aircraft would traverse in descending or ascending that height. Additional study was also completed on the specification of slant wind shear along the runway through the use of an offset towersurface site system.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 728
Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Author: Donald A. Chisholm Publisher: ISBN: Category : Automatic meteorological stations Languages : en Pages : 90
Book Description
A microprocessor-based automated airfield weather observing and forecasting system called MAWS (Modular Automated Weather System) was developed to demonstrate the feasibility of modernizing many of the observing and forecasting functions performed in operational base weather stations. Scott Air Force Base, Illinois, was chosen as the demonstration site and operations were conducted from January 1977 through January 1979. Weather sensors at five observation sites around the airfields were polled several times each minute, the data transmitted over commercial, voice-grade telephone lines to a central supervisory microprocessor where the data were suitably collated, averaged and formatted for display on alpha-numeric display devices at key locations and for magnetic tape archiving for post analysis. The demonstration confirmed that modernized weather support can be largely achieved with state-of-the-art, commercially available hardware/software. Such a system would be compatible with other automation efforts in civilian weather services and other C-cubed efforts in the DOD. The advantage of spatially and temporally detailed weather information in marginal and adverse situations was documented. Sensor siting considerations were addressed in relation to specific weather elements and observational requirements. The contributions of automated met watch procedures and short-range guidance forecasts of RVR landing minima were demonstrated. Feedback on system performance and acceptability was obtained from cognizant AWS offices.
Author: Edward B. Geisler
Author: Edward B. Geisler
Author: Edward B. Geisler
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Author: H. Albert Brown
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Author: 
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Author: Air Force Cambridge Research Laboratories (U.S.)
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Author: Donald A. Chisholm