Surface Windshear Alert System, Part 1: Prototype Development
1998; American Institute of Aeronautics and Astronautics; Volume: 35; Issue: 3 Linguagem: Inglês
10.2514/2.2314
ISSN1533-3868
AutoresH.-T. Liu, C. Golborne, Y. Bun, Megan C. Bartel,
Tópico(s)Meteorological Phenomena and Simulations
ResumoA prototype surface windshear alert system (SURFWAS), a low-cost and portable version of the Federal Aviation Administration low-level windshear alert system, was successfully developed and tested. The SURFWAS consists of a linear array of low-profile remote anemometer stations (RSs) erected alongside the runway(s), a personal computer-based master station (MS) at the air traffic control tower, and three software modules for data preprocessing, acquisition, analysis, display, and broadcast. Wind data measured at the RSs are transmitted sequentially at 0.5 Hz to the MS via a uhf radio link. Windshear profiles are derived directly from the measured wind components projected along the runway axis via the data-analysis module. One of the five windshear states from no windshear to windshear or microburst alert are issued by comparing the maximum windshear to a set of predetermined thresholds related to the well-established F-factor. To minimize false alarms, alerts are issued only if the windshear pattern simultaneously satisfies several criteria. The windshear messages that correspond to the current windshear state together with the wind speeds and directions are displayed and updated every 2 s at the MS. vhf broadcast of windshear messages to the aircraft is updated every 4-8 s
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