BackForwardInstrument:  TMR 

Instrument details
Acronym TMR
Full name TOPEX Microwave Radiometer
Purpose Water vapour correction for the TOPEX-Poseidon radar altimeters (ALT and SSALT)
Short description 3 frequencies, 18, 21 and 37 GHz
Background New development
Scanning Technique Nadir only
Resolution 35 km
Coverage / Cycle Global, in 10 days for cells of 100 km side
Mass 50 kg Power 25 W Data Rate


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1992 to 2005
Last update: 2012-09-16
Detailed characteristics
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
  • Cross-track, special or non-scanning microwave radiometer
WIGOS Subcomponents No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives
  • Integrated Water Vapour (IWV)
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.
VariableRelevance for measuring this variableOperational limitationsExplanation
Integrated Water Vapour (IWV)*4 - fairOver sea only.. Along-track only.MW channel(s) in the water vapour band around 23 GHz