Polarized meteorological radar external calibration method based on simulation calibration body

Abstract

The invention discloses a polarized meteorological radar external calibration method based on a simulation calibration body. The method comprises the following steps of establishing a polarization scattering matrix distortion model, obtaining a dihedral angle and trihedral angle observation matrix containing errors, obtaining a receiving distortion matrix R1 and a transmitting distortion matrix T1, substituting any point target of a simulated dihedral angle and a trihedral angle into the polarization scattering matrix distortion model established in the step S1 to obtain a recovered amplitudegain A1, inverting the receiving distortion matrix R1 and the transmitting distortion matrix T1 by an absolute phase, and simultaneously establishing an observation matrix to obtain a recovery matrix,establishing meteorological data four-channel echo true values, increasing distortion parameters to obtain observed values of meteorological data echoes, applying the distortion matrix of the simulated calibration body in the step S3 to meteorological target echoes to obtain calibration recovery values, and evaluating calibration quality according to the true values, the observed values and the recovery values.

Description

technical field [0001] The invention belongs to the field of polarization radar signal processing, and in particular relates to an external calibration method for polarization meteorological radar based on an analog calibration body. Background technique [0002] Polarization weather radar has attracted much attention because it can effectively improve the detection accuracy of precipitation and the ability to identify meteorological particles. It adds polarization function on the basis of Doppler weather radar, which can emit horizontally polarized waves and vertically polarized waves. To collect co-polarized echoes and cross-channel echoes of meteorological particles. Compared with the traditional Doppler weather radar which can only obtain the three measurement parameters of reflectivity factor (Z), average radial velocity (ARV), and velocity spectral width (VSW), dual-polarization Doppler weather radar can also obtain differential Reflectivity (Z DR ), zero-delay corre...

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Problems solved by technology

[0003] The above calibration techniques for polarimetric weather radars have some shortcomings. First of all, they do not take into account the crosstalk and amplitude imbalance between channels. Although this is considered in the calibration of polarimetric SAR, the calibration of weather radars is also applicable.

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