Sensors
GPM GMI Overview

GMI Characteristics

Channel No	Central Frequency (Ghz)	Central Frequency Stabilization (±MHz)	Bandwidth (Mhz)	Polarization	Integration time (ms)	NEDT (K)	Antenna beamwidth @ 3 dB (º)
1	10.65	10	100	V	9.7	0.96	1.75
2	10.65	10	100	H	9.7	0.96	1.75
3	18.70	20	200	V	5.3	0.84	1.00
4	18.70	20	200	H	5.3	0.84	1.00
5	23.80	20	400	V	5.0	1.05	0.90
6	36.50	50	1000	V	5.0	0.65	0.90
7	36.5	50	1000	H	5.0	0.65	0.90
8	89.00	200	6000	V	2.2	0.57	0.40
9	89.00	200	6000	H	2.2	0.57	0.40
10	165.5	200	3000	V	3.6	1.5	0.40
11	165.5	200	3000	H	3.6	1.5	0.40
1	10.65	10	100	V	9.7	0.96	1.75
12	183.31±3	200	3500	V	3.6	1.5	0.4
13	183.31±7	200	4500	H	3.6	1.5	0.4

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

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Scan geometry of GMI (image credit: NASA)

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Channel footprint scheme of GMI in successive along-sans (image credit: NASA)

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Source: NASA GMI site

Source: NASA GMI ATBD

Source: eoportal.org