Low altitude wind shear wind speed estimation method based on space-time amplitude and phase estimation

Abstract

The invention discloses a low altitude wind shear wind speed estimation method based on space-time amplitude and phase estimation. The method includes the following steps that (1) flight parameters and radar parameters are read from related airborne equipment to be used as apriori information; (2) distance units to be detected are selected, a clutter spectrum registration method is used for processing received data, and accordingly a plurality of independent identically-distributed samples are obtained; (3) the airplane speed is compensated through the apriori information; (4) a space-time APES filter is constructed, ground clutter is restrained in a self-adaptive mode, and the wind speed is estimated; (5) the steps from (2) to (4) are executed again, echo data of all the distance units within the radar working range are processed sequentially, and wind speed curves changed along with the distances are obtained through estimation. By the adoption of the method, the ground clutter can be effectively restrained under the high clutter condition, and the wind field speed can be estimated accurately.

Description

technical field [0001] The invention belongs to the technical field of airborne meteorological radar low-altitude wind shear detection, in particular to a method for estimating low-altitude wind shear wind speed based on space-time amplitude-phase estimation. Background technique [0002] Wind shear is a dangerous meteorological phenomenon in which the wind direction and wind speed change suddenly. When it occurs below 600 meters, it becomes a low-altitude wind shear. It is usually a process in which a strong airflow hits the ground from the air and then spreads around. Low-altitude wind shear has the characteristics of sudden occurrence, short time, small scale, high intensity, and difficulty in detection. When an aircraft enters an area of ​​strong low-altitude wind shear after taking off and landing, it will encounter a sharp change from headwind to tailwind, resulting in a rapid loss of lift. Small or even the aircraft altitude drops rapidly, and in this case, flight acc...

AI Technical Summary

Problems solved by technology

Space Time Adaptive Processing (STAP) is a key technology for airborne phased array radar clutter suppression and target detection. In my country, the application of STAP technology in airborne early warning radar has been quite mature, but this This application is mostly aimed at point targets, and cannot be directly used for the detection and estimation of distributed targets such as low-altitude wind shear, and the airborne weather radar works in the forward-looking state, and the clutter spectrum of the forward-looking array is not stable in distance, so the traditional The STAP method cannot be directly applied to airborne weather radar

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