TRMM underwent an orbital boost in August 2001 in order to increase the lifetime of the satellite and instruments.
After a post-launch checkout period, data started on December, 7th 1997 and ended on April 8th when the instrument was shut down. Two external calibration targets (one cold, one hot) were used to maintain consistency in the measurements over time. It had 5 channels as outlined in the table below. Instrument Descriptionįor a detailed description of TRMM, see the eoPortal Directory. When the PM-ESIP project finished, we continued TMI data processing and product delivery using funds from the NASA MEaSUREs program. The Passive Microwave ESIP (PM-ESIP) was established to provide climate products derived from satellite microwave radiometers and was a joint effort among NASA's Global Hydrology and Climate Center, the University of Alabama in Huntsville, and Remote Sensing Systems.
The initial production of this data set was a collaborative effort with the TRMM Project at NASA Goddard Space Flight Center and the Passive Microwave Earth Science Information Partnership (ESIP) for Climate Studies. The SSTs from TMI were the first satellite microwave SSTs available and have proven to be of great value to many areas of research. In addition to rain rates, TMI also measured sea surface temperatures (SST), ocean surface wind speeds, columnar water vapor, and cloud liquid water. TRMM was a joint program between NASA and the Japan Aerospace Exploration Agency (JAXA).
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This type of orbit precessed approximately 7 degrees per day allowing for TMI to sample the surface at all times of day as opposed to the twice per day windows of the polar-orbiting radiometers. TRMM traveled in a semi-equatorial orbit with an inclination of 35 deg. The design of the instrument was similar to that of other satellite radiometers but the resolution of data measurement was better due to the lower altitude of the satellite orbit. TMI is a multi-channel, dual polarized, conical scanning passive microwave radiometer designed to measure rain rates over a wide swath under the TRMM satellite.
The Tropical Rainfall Measuring Mission (TRMM) was launched November 27, 1997 carrying 5 instruments, one of which is the TRMM Microwave Imager (TMI).
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