by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English
|Statement||John McCarthy, Edward F. Blick, and Kim L. Elmore.|
|Series||NASA contractor report -- NASA CR-3379.|
|Contributions||Blick, Edward F., 1932-, Elmore, Kim L., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., George C. Marshall Space Flight Center.|
|The Physical Object|
|Pagination||x, 86 p. :|
|Number of Pages||86|
Weber et al. - Wind Shear Detection with Airport Surveillance Radars Fig. 3-Calculated area of obscuration for a microburst at our radar site at Huntsville, Ala. Weather reflectivity factors of 10,20 and 30 dBz are assumed. Windshear-alert systems using ground-based radar. A Low-Level Wind-Shear Alert System has been installed on the ground at more than U.S. airports. Wind speed and directional sensors report to a central computer, and controllers can alert pilots in the ¢ vent windshear is detected. But the systems cannot predict when windshears are approaching. Terminal Doppler Weather Radar (TDWR): TDWRs are being deployed at 45 locations across the U.S. Optimum locations for TDWRs are 8 to 12 miles off of the airport proper, and designed to look at the airspace around and over the airport to detect microbursts, gust . Development of an automated windshear detection system using Doppler weather radar Abstract: The US Federal Aviation Administration (FAA) is developing the Terminal Doppler Weather Radar (TDWR) system to determine the location and severity of LAWS (low-altitude windshear) phenomena and other weather hazards (e.g. tornadoes and turbulence) and.
wind shear and turbulence can be strong enough to pose a hazard to aviation requiring the need for a wind shear and turbulence detection solution. Wind Shear Detection Systems Several different commercial off-the-shelf technologies are used around the world for wind shear detection. These include: • Doppler Weather Radar • Doppler Lidar. Abstract: This paper describes an enhanced weather processor for the Federal Aviation Administration's Airport Surveillance Radar (ASR-9) that will include Doppler wind estimation for the detection of low altitude wind shear, scan-to-scan tracking to provide estimates of the speed and direction of storm movement and suppression' of spurious weather reports currently generated by the ASR-9's. Definition. An airborne wind shear warning system is a device which identifies the presence of wind shear.. Description. Some systems detect a potentially severe windshear phenomena far enough in advance of the encounter, in both the takeoff/climbout profile and the approach/landing profile, to allow the pilot to successfully avoid the phenomena. The ARC team has decades of experience with radar site selection for airport windshear detection. Radar sites for airport wind shear require special consideration since the meteorological phenomena to be detected are generally rapidly generated, of short duration and are shallow atmospheric events that sometimes descend from directly above the runway complex.
A predictive windshear system uses Doppler weather radar to look ahead while a reactive system compares inertial and aerodynamic data. Airbus provides a pretty good explanation: [Airbus Flight Operations Briefing Notes, pg. 7] The windshear warning is based on the assessment of current aircraft performance (flight parameters and accelerations). Wind Shear Detection with Airport Surveillance Radars Airport surveillance radars (ASR) utilize a broad, cosecant-squaredelevation beam pattern, rapid azimuthalantennascanning, andcoherentpulsed-Dopplerprocessing to track approaching and departing aircraft. These radars, because of. Wind Shear Detection Using the Next Generation Airport Surveillance Radar (ASR) M.E. Weber 12 July Lincoln Laboratory MASSACHUSETTS INSTITUTE OF TECHNOLOGY LEXINGTON, MASSACHUSETTS Prepared for the Federal Aviation Administration, Washington, D.C. This document is available to the public through the National Technical Information. Doppler radar is radar that makes use of the doppler effect to produce data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection, then analyzing how the original signal has been altered by the object(s) that reflected it. Variations in the frequency of the signal give direct and highly accurate measurements of a.