Estimating One-Minute Rain Rate Distributions in the Tropics From TRMM Satellite Data (October 2017)

• Published in: IEEE journal of selected topics in applied earth observations and remote sensing Vol. 11; no. 10; pp. 3660 - 3667
• Main Authors: Rimven, Geraldine Rangmoen, Paulson, Kevin S., Bellerby, Timothy
• Format: Journal Article
• Language: English
• Published: IEEE 01.10.2018
• Subjects: Extraterrestrial measurements; Link budget; microwave; Orbits; propagation; Rain; rain fade; satellite data; Satellites; Spaceborne radar; spectrum planning
• ISSN: 1939-1404; 2151-1535
• DOI: 10.1109/JSTARS.2018.2869322

Internationally recognized prognostic models of rain fade on terrestrial and Earth-space extremely high frequency (EHF) links rely fundamentally on distributions of 1-min rain rates. In Rec. ITU-R P.837-6, these distributions are estimated from the data provided by Numerical Weather Products (NWPs). NWP yields rain accumulations over regions typically larger than 100 km across and over intervals of 6 h. Over the tropics, the Tropical Rain Measuring Mission (TRMM) satellite data yield instantaneous rain rates over regions 5 km across. This paper uses TRMM data to estimate rain rate distributions for telecommunications regulation over the tropics. Rain rate distributions are calculated for each 1° square between 35° south to 35° north. These distributions of instantaneous rain rates over 5 km squares are transformed to distributions over 1 km squares using a correction calculated from U.K. Nimrod radar data. Results are compared to rain distributions in DBSG3, the database of ITU-R Study Group 3. A comparison with the new Rec. ITU-R P.837-7 is also presented. A table of 0.01% exceeded rain rates over the tropics is provided as associated data.