Low-altitude jet identification method and device based on wind profiler radar

Abstract

The invention discloses a low-altitude jet identification method and device based on wind profiler radar, and relates to the field of meteorological radar. The method comprises: obtaining wind profiledata; converting wind speeds at each height and absolute values of wind speed gradients in the wind profile data at any time t to dimensionless values; calculating a weighted average of the wind speeds at each height and the absolute values of wind speed gradients after the conversion according to a preset weight, and using the weighted average of the heights as low-altitude jet indexes of each height in the wind profile data at time t; and judging the low-altitude jet indexes of each height according to a preset threshold, and obtaining low-altitude jet parameters at time t according to thejudgment result. The low-altitude jet identification method provided by the invention not only realizes a judgment of presence or absence of the low-altitude jet, but also obtains parameters such as an upper and lower boundary height and a maximum wind speed region of the low-altitude jet by judging the low-altitude jet indexes, and can satisfy needs of an airport for automatic identification andearly warning.

Description

technical field [0001] The invention relates to the field of weather radar, in particular to a method and device for identifying low-altitude jet streams based on wind profile radar. Background technique [0002] Low-level jets are narrow bands of strong winds that appear at low altitudes, usually below 600hPa, with strong wind shear on their upper and lower sides. The National Meteorological Administration calls the low-level jets the bands with wind speeds exceeding 12m / s below 1500m. [0003] The ICAO (International Civil Aviation Organization) report pointed out that low-level jet stream is a dangerous weather that seriously affects aviation safety, and the strong wind shear at its upper and lower boundaries often causes serious harm to aircraft in the take-off and landing phase. Therefore, it is of great significance to determine the presence or absence of low-level jets and accurately identify the upper and lower boundaries of low-level jets for the aviation safety of ...

AI Technical Summary

Problems solved by technology

[0004]However, at present, the identification of low-level jets at airports mainly relies on the method of manual identification based on equipment observation data. Manually can only determine the existence of low-level jets, and cannot obtain Accurate data of low-altitude jet streams have the disadvantages of low recognition accuracy and slow recognition speed

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