Tropical Rainfall Measuring Mission (TRMM) Microwave Imager
|SeaVoX Device Catalogue
|The Tropical Rainfall Measuring Mission's (TRMM) Microwave Imager (TMI) is a conical-scanning passive microwave radiometer designed to provide quantitative rainfall information over a wide swath width. It measures microwave energy emitted by the Earth and atmosphere to quantify the water vapour, cloud water, rainfall intensity and rainfall rates in the atmosphere. The TMI design is based on the SSM/I, detecting microwave energy in the form of of brightness temperatures from Earth's surface and atmosphere. It measures this at five separate frequencies. TMI consists of nine separate total-power radiometers, each simultaneously measuring the microwave emission coming from the Earth's surface with the intervening atmosphere. TMI employs an offset parabolic reflector (antenna aperture size of 61 cm) to collect the microwave radiation. The reflector focuses the radiation into two feedhorn. The reflector and feedhorns spin as a unit about an axis parallel to the S/X nadir direction. A cold-space mirror and a warm reference load are attached to the spin axis and do not rotate. The rotating feedhorns observe the fixed cold mirror and warm load once each scan for calibration purposes. The TMI measures radiation intensity at 10.7, 19.4, 21.3, 37 and 85.5 GHz. It has a resolution ranging from 7 km x 5 km to 63 km x 37 km depending on the frequency used, and a feedhorn-reflector rotation period of 1.9 s. https://directory.eoportal.org/web/eoportal/satellite-missions/t/trmm#sensors
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