BackForwardInstrument:  MTVZA 

Instrument details
Acronym MTVZA
Full name Imaging/Sounding Microwave Radiometer
Purpose Multi-purpose imager with temperature/humidity sounding channels for improved precipitation
Short description 20-frequency / 26-channels, band 54 and 183 GHz [see detailed characteristics below]
Background New development
Scanning Technique Conical: 53.3° viewing angle, swath 1500 km – Scan rate: 24.9 scan/min = 15.8 km/scan
Resolution From 10 km at 183 GHz to 200 km at 10.6 GHz; consistent with an antenna diameter of 65 cm
Coverage / Cycle Near-global coverage twice/day
Mass 80 kg Power 80 W Data Rate 35 kbps

 

Providing Agency Roscosmos
Instrument Maturity Flown on operational programme
Utilization Period: 2002 to 2006-04-05
Last update: 2015-08-14
Detailed characteristics
Central frequency (GHz) Bandwidth (MHz) Polarisations NEΔT IFOV Pixel
18.7 800 V, H 0.4 K 52 x160 km 32 x32 km
22.238 1600 V 0.3 K 42 x94 km 32 x32 km
33.0 2000 V, H 0.3 K 35 x76 km 32 x32 km
36.5 2000 V, H 0.3 K 30 x67 km 32 x32 km
42.0 2000 V, H 0.4 K 26 x60 km 32 x32 km
48.0 2000 V, H 0.4 K 24 x43 km 32 x32 km
52.80 400 V 0.4 K 21 x48 km 48 x48 km
53.30 400 V 0.4 K 21 x48 km 48 x48 km
53.80 400 V 0.4 K 21 x48 km 48 x48 km
54.64 400 V 0.4 K 21 x48 km 48 x48 km
55.63 400 V 0.4 K 21 x48 km 48 x48 km
57.290344±0.3222±0.1 50 H 0.4 K 21 x48 km 48 x48 km
57.290344±0.3222±0.05 20 H 0.7 K 21 x48 km 48 x48 km
57.290344±0.3222±0.025 10 H 0.9 K 21 x48 km 48 x48 km
57.290344±0.3222±0.01 5 H 1.3 K 21 x48 km 48 x48 km
57.290344±0.3222±0.005 3 H 1.7 K 21 x48 km 48 x48 km
91.655 3000 V, H 0.6 K 14 x30 km 16 x16 km
183.31 ± 7.0 1500 V 0.5 K 9 x21 km 32 x32 km
183.31 ± 3.0 1000 V 0.6 K 9 x21 km 32 x32 km
183.31 ± 1.0 500 V 0.8 K 9 x21 km 32 x32 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

Instrument classification
  • Earth observation instrument
  • Passive microwave radiometer
  • Conical scanning microwave radiometer
Mission objectives
Primary mission objectives
  • Precipitation intensity at surface (liquid or solid)
  • Sea-ice cover
  • Wind speed over the surface (horizontal)
Secondary mission objectives
  • Atmospheric temperature
  • Cloud ice (total column)
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Tentative 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
VariableRelevance for measuring this variableOperational limitationsExplanation
Accumulated precipitation (over 24 h)4 - fairPoor time sampling.. Time sampling to be interpolated by GEO.MW channels around 19, 23, 37 and 90 GHz, and in 54 and 183 GHz bands
Atmospheric temperature3 - highCoarse vertical resolution.Many MW channels in the 54 GHz band. Nearly all-weather sounding
Cloud drop effective radius4 - fairNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Cloud ice4 - fairNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Cloud ice (total column)3 - highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Cloud ice effective radius4 - fairNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Cloud liquid water (CLW)3 - highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Cloud liquid water (CLW) total column2 - very highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Downward long-wave irradiance at Earth surface5 - marginalHighly indirect.MW channels in bands 54 and 183 GHz to account for downward cloud radiation
Freezing level height in clouds3 - highNo specific limitation.MW channels in the 54 GHz band. Inference from the temperature profile
Long-wave Earth surface emissivity5 - marginalLong time series needed.MW channels around 19, 37 and 90 GHz. Emissivity across this MW range inferred by statistical analysis
Melting layer depth in clouds3 - highNo specific limitation.MW channels in the 54 GHz band. Inference from the temperature profile
Precipitation intensity at surface (liquid or solid)3 - highNo specific limitation.MW channels around 19, 23, 37 and 90 GHz; and in bands 54 and 183 GHz, insensitive to surface emissivity and providing information on atmospheric structure
Sea-ice cover3 - highNo specific limitation.MW channels around 19, 37 and 90 GHz
Sea-ice type5 - marginalNo specific limitation.MW channels around 19, 37 and 90 GHz. Type interpreted as age/roughness
Snow cover3 - highCoarse spatial resolution.MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Snow status (wet/dry)3 - highCoarse spatial resolution.MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Snow water equivalent4 - fairCoarse 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 humidity4 - fairCoarse vertical resolution.MW channels in the 183 GHz band, and 54 GHz for temperature and liquid water corrections
Integrated Water Vapour (IWV)1 - primaryNo specific limitation.MW channel(s) in the water vapour bands around 23 and 183 GHz
Upward long-wave irradiance at Earth surface4 - fairHighly indirect.MW channels is the 54 and 183 GHz bands to infer the impact of clouds on the upward LW radiation
Wind speed over the surface (horizontal)4 - fairOver sea only.MW channels around 19 and 37 GHz