Airborne Doppler Radar Flight Experiments for the Detection of Microbursts PDF Download
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Author: Hans-J C. Blume
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
In the interest of aviation safety, NASA and the Federal Aviation Administration (FAA) are jointly conducting research to determine the applicability of airborne, coherent Doppler radar techniques to detect early microburst in wind shear conditions during aircraft takeoff and landing. If early detection of these severe wind shear conditions can be demonstrated, avoidance maneuvers can be exercised and significantly reduce the probability of aircraft disaster. Researchers have developed a computer model of the radar which predicts its response when viewing a simulated microburst against the simulated clutter background of an airport, the so-called radar-microburst-ground clutter model. Studies employing this model revealed that Doppler radar can accurately detect microburst ahead of the aircraft in time for pilot evasive response, but flight experiments will be required for complete performance evaluation of the system.
Author: Hans-J C. Blume
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
In the interest of aviation safety, NASA and the Federal Aviation Administration (FAA) are jointly conducting research to determine the applicability of airborne, coherent Doppler radar techniques to detect early microburst in wind shear conditions during aircraft takeoff and landing. If early detection of these severe wind shear conditions can be demonstrated, avoidance maneuvers can be exercised and significantly reduce the probability of aircraft disaster. Researchers have developed a computer model of the radar which predicts its response when viewing a simulated microburst against the simulated clutter background of an airport, the so-called radar-microburst-ground clutter model. Studies employing this model revealed that Doppler radar can accurately detect microburst ahead of the aircraft in time for pilot evasive response, but flight experiments will be required for complete performance evaluation of the system.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 404
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Author: David A. Hinton
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ISBN:
Category : Doppler radar
Languages : en
Pages : 34
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Author:
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ISBN:
Category :
Languages : en
Pages : 730
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Author:
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ISBN:
Category :
Languages : en
Pages : 510
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 516
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Author: Ralph J. Donaldson
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ISBN:
Category : Doppler radar
Languages : en
Pages : 36
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Book Description
The Joint Doppler Operational Project was a cooperative inter-agency program directed toward the evaluation of recent advances in Doppler weather radar technology for operational applications by the participating agencies. The first two years of testing demonstrated the decisive superiority of Doppler techniques, in comparison with conventional methods, for reliable identification and early warning of tornadoes and other severe thunderstorm hazards. During the final year, the program evaluated the format and effectiveness of manually aided automatic display products transmitted in near-real time to operational agencies remotely located from the radar. Experiences of operating personnel utilizing these new techniques provide input toward system definition of NEXRAD, the Next Generation Weather Radar network now under development. One of the most encouraging examples of the enhanced warning capability realized by the remote transmission of the automated Doppler format was a successful forecast of severe weather for an Air Force Base which was a crucial factor in saving a fleet of aircraft from severe hail damage.
Author: Patrick Norbert Dills
Publisher:
ISBN:
Category :
Languages : en
Pages : 244
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Author: James W. Wilson
Publisher:
ISBN:
Category : Doppler radar
Languages : en
Pages : 32
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Doppler weather radar data from the Joint Airport Weather Studies (JAWS) Project are used to determine the horizontal and vertical structure of airflow within microbursts. Typically, the associated downdraft is about 1 km wide and begins to spread horizontally at a height below 1 km. The median time is 5 min from initial divergence at the surface to maximum different wind velocity across the microburst. The height of maximum differential velocity is 75 m. The median velocity different is 22 m/s over an average distance of 3.1 km. The outflow is assymetric, averaging twice as strong along the maximum shear axis compared to the minimum axis. Doppler radar could be an effective means for identifying microbursts and warning aircraft of wind shear hazards. For microburst detection such a radar must be able to measure wind velocities in clear air as well as heavy rain and hail. Scan update rates should be approximately every 2 min and the lowest few hundred meters of the atmosphere must be observed. Ground clutter must be considerably reduced from levels typically obtained with present Doppler radars.
Author:
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ISBN:
Category :
Languages : en
Pages : 124
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