Development And Evaluation Of A Tower Slant Visual Range System
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Development And Evaluation Of A Tower Slant Visual Range System
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Author : Edward B. Geisler
language : en
Publisher:
Release Date : 1979
Development And Evaluation Of A Tower Slant Visual Range System written by Edward B. Geisler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Markov processes categories.
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).
Development And Evaluation Of A Tower Slant Visual Range System
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Author : Edward B. Geisler
language : en
Publisher:
Release Date : 1979
Development And Evaluation Of A Tower Slant Visual Range System written by Edward B. Geisler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Visibility categories.
Analysis And Specification Of Slant Wind Shear
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Author : H. Albert Brown
language : en
Publisher:
Release Date : 1982
Analysis And Specification Of Slant Wind Shear written by H. Albert Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Meteorological instruments categories.
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.
Instrumentation Papers
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Author :
language : en
Publisher:
Release Date : 1979
Instrumentation Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Aeronautical instruments categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1989
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aeronautics categories.
A Demonstration Test Of The Modular Automated Weather System Maws
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Author : Donald A. Chisholm
language : en
Publisher:
Release Date : 1980
A Demonstration Test Of The Modular Automated Weather System Maws written by Donald A. Chisholm and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Automatic meteorological stations categories.
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.
Survey Of Sensors For Automated Tactical Weather Observations
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Author : Eugene Y. Moroz
language : en
Publisher:
Release Date : 1980
Survey Of Sensors For Automated Tactical Weather Observations written by Eugene Y. Moroz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Automatic meteorological stations categories.
Current requirements for tactical weather systems at fixed and bare- base airfields necessitate an upgrading of meteorological sensor capability, system automation, and a range of data dissemination options. A program has been initiated at the Air Force Geophysics Laboratory to implement these objectives. In the first phase of this program, a survey of the state-of-the-art has been made for the identification of equipment suitable for such a system. Government inventoried instrumentation, as well as those from commercial sources, have been considered. Criteria to be used in sensor selection will include both accuracy and the ability to operate trouble free over a wide range of environmental extremes. When appropriate, in-house programs will be initiated to correct deficiencies. During the coming year, field tests and intercomparisons will be made of selected sensors. Instrumentation will eventually be integrated into an automated system with local and/or remote display of weather elements tailored to user requirements.
An Automated Low Cloud Prediction System
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Author : Edward B. Geisler
language : en
Publisher:
Release Date : 1981
An Automated Low Cloud Prediction System written by Edward B. Geisler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Automatic meteorological stations categories.
At the Air Force Geophysics Laboratory (AFGL) Weather Test Facility (WTF) at Otis AFB, MA, a network of cloud base height, visibility, and wind measuring instruments were used to explore techniques for the short range prediction of low cloud ceiling. AFGL developed this system in response to the USAF Air Weather Service's requirements to modernize its basic weather support capabilities. This system allowed AFGL to evaluate the ability of statistical forecasting techniques to provide decision assistance significantly improved over the decision assistance currently provided by climatology and persistence. The approach relies upon the use of a hierarchical clustering algorithm to transform the raw cloud base height data into an automated low cloud observation. Four prediction techniques (Regression Estimation of Event Probabilities, Equivalent Markov, climatology, and persistence) yielding probability estimates of low cloud ceiling were evaluated and comparisons made to determine their respective accuracy and reliability. In addition, thresholding techniques were used to convert probability forecasts (unit bias, maximum probability, iterative, and persistence). Analysis of the data collected at the AFGL WTF demonstrates the accuracy and reliability of the automated low cloud prediction system. Regression estimation of event probabilities provided accurate, reliable, high resolution probability forecasts with results superior to climatology, persistence, and Equivalent Markov.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date : 1979
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Science categories.
Accessions List
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Author : Environmental Science Information Center. Library and Information Services Division
language : en
Publisher:
Release Date : 1981
Accessions List written by Environmental Science Information Center. Library and Information Services Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Ecology categories.