Compressed sensing based onboard phased array radar low-altitude wind shear wind speed estimation method

Abstract

A compressed sensing based onboard phased array radar low-altitude wind shear wind speed estimation method includes creating a transformation matrix of a reference distance unit and a to-be-detected distance unit according to a space-time interpolation method, acquiring an independently and identically distributed sample of a clutter covariance matrix forming the to-be-detected distance unit, and acquiring an estimated value of the clutter covariance matrix to achieve clutter rejection; taking radar main lobe length as prior information, and creating a generalized space guide vector of a wind shear field; taking signal spectral width as prior information, and creating a generalized time guide vector of the wind shear field; according to the generalized space guide vector and the generalized time guide vector, creating a wind speed based wind shear field space-time base dictionary and creating a sparse basis matrix; observing echo signals subjected to clutter rejection in the first step, and recovering the echo signals by the aid of the sparse basis matrix to achieve wind speed estimation. The method has the advantage that accurate wind field speed estimation results can be still acquired when the number of pulses is small and the signal-to-noise ratio is low.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and particularly designs an airborne phased array radar low-altitude wind shear wind speed estimation method based on compressed sensing. technical background [0002] Low-altitude wind shear usually refers to the meteorological phenomenon of sudden changes in wind direction and speed at altitudes below 600m, and is one of the weather phenomena that poses the greatest threat to air transport safety. Due to the characteristics of short time, small scale and high intensity of wind shear phenomenon, it brings a series of problems such as difficulty in detection and prediction. When an aircraft enters a strong wind shear area during takeoff and landing, due to the lack of sufficient adjustment space, improper operation can easily cause flight accidents. Therefore, the research on low-altitude windshear detection technology has become an important topic in the field of modern air tran...

AI Technical Summary

Problems solved by technology

Although these methods have better wind speed estimation performance when the number of pulses is large and the SNR is high, the performance of wind speed estimation decreases when the number of pulses is small and the SNR is low.

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