Low-altitude wind shear wind speed estimation method based on space-time optimal processor

Abstract

The invention relates to a low-altitude wind shear wind speed estimating method based on a space-time optimal processor and belongs to the field of airborne meteorological radar signal processing. The low-altitude wind shear wind speed estimating method based on the space-time optimal processor comprises the following steps of 1) reading aeroplane state parameters, radar antenna scanning parameters and the like from associated airborne equipment as prior information; 2) selecting a distance unit to be detected, and correcting the distance dependence of ground clutter through a space-time interpolation method; 3) compensating aeroplane speed through the prior information; 4) estimating the ground clutter covariance matrix of the distance unit to be detected; 5) suppressing the ground clutter and performing wind speed estimation through the space-time optimal processor; 6) repeating the steps of 2)-5) and sequentially performing wind speed estimation on the echo data of all the distance units. The low-altitude wind shear wind speed estimating method based on the space-time optimal processor is used for solving the problem of poor wind speed estimation precision under the background of heavy clutter and imports space-time information into an airborne meteorological radar. Simulation results prove the effectiveness of the low-altitude wind shear wind speed estimating method based on the space-time optimal processor.

Description

technical field [0001] The invention belongs to the technical field of airborne meteorological radar low-altitude windshear detection, in particular to a method for estimating low-altitude windshear wind speed based on a space-time optimal processor. Background technique [0002] Airborne weather radar can detect and warn of thunderstorms, wind shear, turbulence and other disastrous weather. It is an important device for aircraft to perceive airway weather in real time. Its ability to detect dangerous weather is crucial to ensure the safety of aircraft. Low-altitude wind shear often refers to the meteorological phenomenon of sudden changes in wind direction and wind speed below an altitude of 600 meters. Low-altitude wind shear has the characteristics of sudden occurrence, short time, small scale, high intensity, and difficulty in detection. When an aircraft takes off and lands into a strong low-altitude wind shear area, it will face lift loss caused by changes in wind direc...

AI Technical Summary

Problems solved by technology

In my country, the application of STAP technology in airborne early warning radar is quite mature, but this kind of 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, the clutter spectrum of the forward-looking array is not stable in the distance, so the traditional space-time optimal processor cannot be directly applied to the airborne weather radar

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