WMO OSCAR | Details for Instrument MWRI-RM

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Instrument: MWRI-RM

Instrument details

Acronym	MWRI-RM
Full name	Micro-Wave Radiation Imager for the Rainfall Mission
Purpose	Multi-purpose imagery with emphasis on precipitation
Short description	17 frequencies, 26 channels, including bands 54, 118 and 183 GHz for temperature and humidity [see detailed characteristics below] Calibration monitoring here
Background	Improved version of the MWRI radiometer flown on the FY-3 satellites in sunsynchronous orbits
Scanning Technique	Conical: 53.1° zenith angle, swath 800 km
Resolution	Changing with frequency, consistent with an antenna diameter of 180 cm
Coverage / Cycle	Limited coverage once/day consistent with the 50° orbital inclination
Mass		Power	Data Rate

Providing Agency	CMA
Instrument Maturity	Flown on operational programme
Utilization Period:	2023 to 2032
Last update:	2025-01-29

Detailed characteristics

Channel number	Central frequency	Bandwidth	Polarization	NEΔT	IFOV
1	10.65 GHz	180 MHz	V，H	0.5 K	21×35 km
2	18.7 GHz	200 MHz	V，H	0.5 K	14×23 km
3	23.8 GHz	400 MHz	V，H	0.5 K	13×21 km
4	36.5 GHz	900 MHz	V，H	0.5 K	9×15 km
5	50.30 GHz	400 MHz	V，H	0.5 K	7×11 km
6	52.61 GHz	400 MHz	V，H	0.5 K	7×11 km
7	53.24 GHz	400 MHz	V，H	0.5 K	7×11 km
8	53.75 GHz	400 MHz	V，H	0.5 K	7×11 km
9	89.0 GHz	3000 MHz	V，H	0.5 K	5×8 km
10	118.7503±3.2 GHz	2x500 MHz	V	0.8 K	4×7 km
11	118.7503±2.1 GHz	2x400 MHz	V	0.8 K	4×7 km
12	118.7503±1.4 GHz	2x400 MHz	V	0.8 K	4×7 km
13	118.7503±1.2 GHz	2x400 MHz	V	0.8 K	4×7 km
14	165.5±0.75 GHz	2x1350 MHz	V	0.8 K	4×6 km
15	183.31±2.0 GHz	2x1500 MHz	V	0.8 K	4×7 km
16	183.31±3.4 GHz	2x1500 MHz	V	0.8 K	4×7 km
17	183.31±7.0 GHz	2x2000 MHz	V	0.8 K	4×7 km

Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Feng-Yun - 3 (CMA)
- FY-3G (see instrument status) 2023 - 2028
- FY-3I (see instrument status) 2026 - 2032

Instrument classification

Earth observation instrument
Passive microwave radiometer
Conical scanning microwave radiometer

WIGOS Subcomponents

Subcomponent 1
MW sounder and imagery in inclined orbits
MW sounder and imager in inclined orbits

Mission objectives

Primary mission objectives

Cloud liquid water (CLW) total column
Integrated Water Vapour (IWV)
Precipitation intensity at surface (liquid or solid)
Sea surface temperature
Snow cover
Snow water equivalent
Soil moisture at surface
Wind speed (near surface)

Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
Note: * Primary mission objective.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Integrated Water Vapour (IWV)*	1 - primary	No specific limitation.	MW channel(s) in the water vapour bands around 23 and 183 GHz
Cloud ice effective radius	2 - very high	No specific limitation.	MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud liquid water (CLW)	2 - very high	No specific limitation.	MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud liquid water (CLW) total column*	2 - very high	No specific limitation.	MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Snow status (wet/dry)	2 - very high	Coarse spatial resolution.	MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Snow water equivalent*	2 - very high	Coarse spatial resolution.. Ground stations network needed.	MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Specific humidity	2 - very high	Coarse vertical resolution.	MW channels in the 183 GHz band, and 54 GHz for temperature and liquid water corrections
Accumulated precipitation	3 - high	Poor time sampling.. Time sampling to be interpolated by GEO.	MW channels around 19, 23, 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Atmospheric temperature	3 - high	Coarse vertical resolution.	54 and 118 GHz bands. Nearly all-weather sounding
Cloud ice	3 - high	No specific limitation.	MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud ice Total Column	3 - high	No specific limitation.	MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Freezing level height in clouds	3 - high	No specific limitation.	MW channels in the 54 and 118 GHz bands. Inference from the temperature profile
Melting layer depth in clouds	3 - high	No specific limitation.	MW channels in the 54 and 118 GHz bands. Inference from the temperature profile
Precipitation intensity at surface (liquid or solid)*	3 - high	No specific limitation.	MW channels around 19, 23, 37 and 90 GHz; and in bands 54, 118 and 183 GHz, insensitive to surface emissivity and providing information on atmospheric structure
Snow cover*	3 - high	Coarse spatial resolution.	MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Wind speed (near surface)*	4 - fair	Over sea only.	MW channels around 19 and 37 GHz
Cloud drop effective radius	5 - marginal	Highly indirect.	MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Downward long-wave irradiance at Earth surface	5 - marginal	Highly indirect.	MW channels in bands 54, 118 and 183 GHz to account for downward cloud radiation
Long-wave Earth surface emissivity	5 - marginal	Long time series needed.	MW channels around 19, 37 and 90 GHz. Emissivity across this MW range inferred by statistical analysis
Upward long-wave irradiance at Earth surface	5 - marginal	Highly indirect.	MW channels is the 54, 118 and 183 GHz bands to infer the impact of clouds on the upward LW radiation

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