WMO OSCAR | Details for Instrument MWRI-1

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Instrument: MWRI-1

Instrument details

Acronym	MWRI-1
Full name	Micro-Wave Radiation Imager 1
Purpose	Multi-purpose imagery with emphasis on precipitation
Short description	6 frequencies, 12 channels [see detailed characteristics below] Calibration monitoring here
Background	New development. Operations on FY-3A stopped in 2010
Scanning Technique	Conical: 53.1° zenith angle, swath 1400 km - Scan rate: 35.3 scan/min = 11.2 km/scan
Resolution	Changing with frequency, consistent with an antenna diameter of 90 cm
Coverage / Cycle	Global coverage once/day
Mass	175 kg	Power	125 W	Data Rate	100 kbps

Providing Agency	CMA
Instrument Maturity	Flown on operational programme
Utilization Period:	2008 to 2025
Last update:	2025-01-29

Detailed characteristics

Channel number	Central frequency (GHz)	Bandwidth (MHz)	Polarisations	NEΔT	IFOV	Pixel
1	10.65	180	V, H	0.5 K	51 x 85 km	40 x11.2 km
2	18.7	200	V, H	0.5 K	30 x 50 km	40 x11.2 km
3	23.8	400	V, H	0.8 K	27 x45 km	20 x11.2 km
4	36.5	900	V, H	0.5 K	18 x30 km	20 x11.2 km
5	89	4600	V, H	1.0 K	9 x15 km	10 x11.2 km
6	150	3000	V, H	1.3 K	7.5 x12 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-3A (see instrument status) Aug 2008 - Jun 2008
- FY-3B (see instrument status) Feb 2011 - Jun 2020
- FY-3C (see instrument status) 2014 - Feb 2020
- FY-3D (see instrument status) Feb 2018 - 2025

Instrument classification

Earth observation instrument
Passive microwave radiometer
Conical scanning microwave radiometer

WIGOS Subcomponents

Subcomponent 1
MW imagery [in SSO]
MW imager [in SSO]

Mission objectives

Primary mission objectives

Precipitation intensity at surface (liquid or solid)
Sea-ice cover
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
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
Cloud liquid water (CLW)	3 - high	No specific limitation.	MW channels around 37 and 90 GHz
Cloud liquid water (CLW) total column	3 - high	No specific limitation.	MW channels around 37 and 90 GHz
Sea-ice cover*	3 - high	No specific limitation.	MW channels around 10, 19, 37 and 90 GHz
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
Soil moisture at surface	3 - high	Coarse spatial resolution.. Strongly affected by vegetation.	MW channels around 10 GHz
Integrated Water Vapour (IWV)	3 - high	Over sea only.	MW channel(s) in the water vapour band around 23 GHz
Wind speed (near surface)*	3 - high	Over sea only.	MW channels around 10, 19 and 37 GHz
Accumulated precipitation	4 - fair	Poor time sampling.. Time sampling to be interpolated by GEO.	MW channels around 10, 19, 23, 37 and 90 GHz
Long-wave Earth surface emissivity	4 - fair	Long time series needed.	MW channels around 10, 19, 37 and 90 GHz. Emissivity across this MW range inferred by statistical analysis
Precipitation intensity at surface (liquid or solid)*	4 - fair	No specific limitation.	MW channels around 10, 19, 23, 37 and 90 GHz, to cover sea and land, heavy and light precipitation
Sea-ice type	4 - fair	No specific limitation.	MW channels around 10, 19, 37 and 90 GHz. Type interpreted as age/roughness
Land surface temperature	5 - marginal	Coarse spatial resolution.	MW channels around 10 GHz
Sea surface temperature	5 - marginal	Warm temperature only.	MW channels around 10 GHz

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