Real-time Monitoring and Calibration of Weather Radar Network using Multiple Techniques

We present an innovative and integrated framework for real-time monitoring and calibration of weather radar networks, utilizing multiple techniques to diagnose reflectivity calibration, antenna pointing, and dual-polarisation moments. The framework incorporates a volume-matching technique for tracking absolute calibration with respect to the Global Precipitation Measurement (GPM) spaceborne radar, the Relative Calibration Adjustment (RCA) technique for tracking relative changes, and solar calibration for daily changes in solar power and antenna pointing error. Additionally, we use techniques for monitoring light rain to track differential reflectivity and dual-polarisation moments. The framework currently monitors 67+ radars from the Australian radar network, and its modularity allows for tailored diagnostics for specific radar characteristics. We found that changes in RCA are highly correlated with changes in absolute calibration, provided changes in antenna pointing are ruled out. The results are presented in an interactive dashboard for diverse audiences, including radar engineers, researchers, forecasters, and management, and are operational at the Australian Bureau of Meteorology.