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Sensors
TRMM TMI Overview

TMI Characteristics (From Kummerow et al. 1998)
Channel Number 1 2 3 4 5 6 7 8 9
Central freq (GHz) 10.65 10.65 19.35 19.35 21.3 37.0 37.0 85.5 85.5
Polarization V H V H V V H V H
Bandwidth (MHz) 100 100 500 500 200 2000 2000 3000 3000
Stability (MHz) 10 10 20 20 20 50 50 100 100
Beamwidth (deg) 3.68 3.75 1.90 1.88 1.70 1.0 1.0 0.42 0.23
IFOV Along-Track (km) 59.0 60.1 30.5 30.1 27.2 16.0 16.0 6.7 6.9
IFOV Cross-Track (km) 35.7 36.4 18.4 18.2 16.5 9.7 9.7 4.1 4.2
Integration time
per sample (ms)		 6.6 6.6 6.6 6.6 6.6 6.6 6.6 3.3 3.3
EFOV Along-Track (km) 63.2 63.2 30.4 30.4 22.6 16.0 16.0 7.2 7.2
EFOV Cross-Track (km) 9.1 9.1 9.1 9.1 9.1 9.1 9.1 4.6 4.6
EFOVs per scan 104 104 104 104 104 104 104 208 208
Samples (N)
per beamwidth		 4 4 2 2 2 1 1 1 1
Beam EFOV ( km x km ) 63 x 63 63 x 63 30 x 30 30 x 30 23 x 23 16 x 9 16 x 9 7 x 5 7 x 5
Beam EFOVs per scan 26 26 52 52 52 104 104 208 208
NEdT (K) 0.63 0.54 0.50 0.47 0.71 0.36 0.31 0.52 0.93

  • V: Polarization vector is parallel to scan plane at nadir
  • H: Polarization vector is perpendicular to scan plane at nadir


Source: TRMM official site