Combined space-time main channel adaptive processing-based low-altitude wind shear wind speed estimation method

Abstract

The invention relates to a combined space-time main channel adaptive processing-based low-altitude wind shear wind speed estimation method. The method includes the following steps that: aircraft and radar parameters are read; the parameters are used to perform phase compensation on radar echo signals; distance-dependent correction is performed on echo signals obtained after phase compensation is performed on the distance units of a radar, and the clutter covariance matrix of a distance unit to be measured is estimated; a dimensionality reduction joint space-time transformation matrix is constructed so as to perform dimensionality reduction adaptive processing on the radar echo signals; the dimensionality reduction joint space-time transformation matrix and the clutter covariance matrix areadopted to solve the optimal weight vector of a combined space-time main channel adaptive dimensionality reduction processor; and the optimal weight vector is utilized to construct a cost function, and the maximum value of the cost function is searched, so that the wind speed of the unit to be measured can be estimated. In order to solve the problems of the reduction of clutter suppression performance and the inaccuracy of low-altitude wind shear wind speed estimation under a condition that an airborne weather radar is affected by amplitude and phase error, the combined space-time main channel adaptive processor is applied to the low-altitude wind shear wind speed estimation, so that ground clutter suppression and wind speed estimation can be effectively achieved.

Description

Technical field [0001] The invention belongs to the technical field of low-altitude windshear detection by airborne weather radars, and particularly relates to a low-altitude windshear wind speed estimation method based on adaptive processing of a combined space-time main channel. Background technique [0002] Low-altitude wind shear is one of the catastrophic weather in the field of civil aviation transportation. It has the characteristics of short duration, small area of ​​action, high instantaneous intensity, and high hazard. When an aircraft encounters windshear during takeoff or approach, due to the low flight altitude, the pilot cannot adjust the aircraft attitude in time, which may cause an air crash. Therefore, the detection and early warning of low-altitude windshear has become the current civil aviation field As an important subject of windshear, wind shear wind speed estimation is the basis of the entire windshear detection process, which directly affects the accuracy ...

AI Technical Summary

Problems solved by technology

So far, the traditional STAP technology mostly focuses on the detection and parameter estimation of point targets, but there are relatively few references on the detection and parameter estimation of distributed targets such as low-altitude wind shear, especially the airborne weather radar under the condition of amplitude and phase errors There is no literature report on low-altitude wind shear detection research

Images