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TRMM Precipitation Radar (PR) Level 1B data provides calibrated received power and reflectivity measurements from the first spaceborne precipitation radar. The dataset includes detailed calibration information based on internal system models, temperature sensors, and external Active Radar Calibrator checks performed every two months. Measurements cover both land and ocean, with spatial and temporal resolutions that changed after the satellite orbit boost on August 24, 2001.
Data resolution specifications (swath width, horizontal resolution) changed after the TRMM orbit boost on August 24, 2001; users must account for this when analyzing time series. Received power values assume Rayleigh fading, introducing a potential bias error of 1-2 dB for scatterers with different fading characteristics.