Metallic ball calibration method for X-band solid dual-polarization weather radar

Abstract

The invention provides a metallic ball calibration method for an X-band solid dual-polarization weather radar, and the method comprises the steps: respectively selecting a test point in a broad pulse detection range and a narrow pulse detection range of the radar; placing a metallic ball at each test point; calculating a corresponding radar observation elevation angle, an radar observation azimuth angle and a radar observation database number for each metallic ball through employing the GPS information of each metallic ball and the longitude and latitude and height information of the radar; setting a calibration observation mode, and obtaining the observation data, wherein the calibration observation mode comprises the horizontal change range of a radar observation azimuth, the change range of the radar observation elevation angle and a stepping angle, and the observation data comprises a radar reflectivity factor observed value and a difference reflectivity factor observed value; and enabling the radar reflectivity factor observed value and the difference reflectivity factor observed value to be respectively compared with a reflectivity factor theoretical value and a difference reflectivity factor theoretical value, wherein the differences serve as the measurement error of the radar; and correcting the detection result of the radar in a corresponding detection range through the measurement error.

Description

technical field [0001] The present invention relates to weather radar, more specifically, to a metal ball calibration method for X-band solid-state dual-polarization weather radar. Background technique [0002] Weather radar plays a very important role in the modern comprehensive meteorological observation system. It has a good ability to monitor small and medium-scale weather systems and provides intuitive data for short-term weather forecasts. With the application of dual polarization technology and the maturity of solid-state transmitter technology, the performance of weather radar has been continuously improved. Dual-polarization weather radar can not only obtain radar reflectivity factor (Z), radial velocity (V), velocity spectral width (W), but also differential reflectivity (Z DR ), zero-lag cross-correlation coefficient (ρ0), differential propagation phase shift (Φ DP ), unit differential propagation phase shift (K DP ) and linear depolarization ratio (L DR ) fiv...

AI Technical Summary

Problems solved by technology

The calibration methods of differential reflectivity mainly include: the signal source method is suitable for calibrating the receiving active channel; the solar method can only calibrate the Z generated by the radar receiving channel. DR Systematic error does not include the Z introduced by the radar transmission path DR system error, and th...

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