Metal sphere calibration method for x-band solid-state dual-polarization weather radar

Abstract

The invention provides a metal ball calibration method for X-band solid-state dual-polarization weather radar, comprising: respectively selecting a test point in the radar wide pulse detection range and narrow pulse detection range; at each test point, placing a Metal ball; for each metal ball, use its GPS information and radar longitude, latitude and height information to calculate the corresponding radar observation elevation angle, azimuth angle and the number of libraries; set the calibration observation mode, obtain observation data, calibration observation mode includes radar observation azimuth The horizontal change range, and the change range and step angle of the radar observation elevation angle, the observation data include the radar reflectivity factor observation value and the differential reflectivity observation value; the difference between the radar reflectivity factor observation value and the radar reflectivity factor theoretical value The difference or the difference between the observed value of the differential reflectivity and the theoretical value of the differential reflectivity is used as the measurement error of the radar, and the detection result of the radar within the corresponding detection range is corrected by using 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 this method can only be implemented within a limited period of time every day; the small raindrop method can calibrate the system error of the entire radar, but the limitation is that the calibration process must be completed under the condition of very small stratiform cloud precipitation, which is difficult Meet the requirements of business operation

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