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Instrument Descriptions
- AMSU-A
- MHS
- SSMIS
- WindSat
- AMSR-E
- AMSR-2
- SNPP ATMS
- TRMM TMI
- GPM GMI
- Megha-Tropiques MADRAS
- Megha-Tropiques SAPHIR

Algorithm

Product Monitoring

Radiometric Performance
- TB Comparison
- Radiometric Bias Monitoring

Geophysical Performance
- Geophysical Performance Monitoring
- Performance Time Series

Downloads

Please note that this website is managed by the MiRS Algorithm Development Team at NOAA/NESDIS/STAR, and content may reflect development versions of the MiRS algorithm. Retrieval products and validation metrics shown here may not align with the official operational products at the NOAA Office of Satellite and Product Operations (OSPO), and archived at NOAA CLASS. To access operational MiRS products, refer to OSPO or CLASS. To obtain products from the development version of MiRS, visit the Download section of this site.

Data and images displayed on STAR sites are provided for experimental use only and are not official operational NOAA products. More information>>

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MiRS Sensors
GPM GMI Overview

photo: GPM Microwave Imager

photo: GPM Microwave Imager

Satellite(s)

Global Precipitation Measurement (GPM)

MiRS Production Status

Currently operational

GMI Characteristics
Channel No	Central Frequency (Ghz)	Central Frequency Stabilization (±MHz)	Bandwidth (Mhz)	Polarization	Integration time (ms)	NEDT (K)	Antenna beamwidth @ 3dB (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	166.0	200	3000	V	3.6	1.5	0.40
11	166.0	200	3000	H	3.6	1.5	0.40
12	183.31±3	200	3500	V	3.6	1.5	0.4
13	183.31±7	200	4500	V	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

Scan geometry of GMI (image credit: NASA)

Scan geometry of GMI

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

Channel footprint scheme of GMI in successive along-scans

Notes:

Source: NASA GMI site

Source: NASA GMI ATBD

Source: eoportal.org

Photo: NASA Precipitation Measurement Missions.