BackForwardInstrument:  SAR-Travers 

Instrument details
Acronym SAR-Travers
Full name Two-frequency SAR
Purpose High-resolution all-weather imagery of ocean and land, specially suited for soil moisture
Short description Two frequencies: L-band (1.28 GHz) and S-band (3.28 GHz), polarisation HH or VV, operating in parallel
Background It is not sure that SAR-Travers has been actually flown on Resurs-O1-1. Certainly was flown on the PRIRODA mission on the MIR station in 1996
Scanning Technique Pushbroom, side looking 35°, swath 80 km
Resolution 20 m
Coverage / Cycle Global in 6 months (assuming 10 % duty cycle)
Mass Power 850 W Data Rate 32 Mbps

 

Providing Agency Roscosmos
Instrument Maturity Flown on operational programme
Utilization Period: 1986 to 1986-11-11
Last update: 2012-09-13
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
  • Active and radio-occultation sensor
  • Imaging radar (SAR)
Mission objectives
Primary mission objectives
  • Biomass
  • Fraction of vegetated land
  • Land cover
  • Land surface topography
  • Oil spill cover
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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
Sea-ice type3 - highNo specific limitation.L- and S-band SAR. Type interpreted as age/roughness
Sea-ice cover1 - primaryNo specific limitation.L- and S-band SAR
Oil spill cover2 - very highInfrequent coverage.L- and S-band SAR
Significant wave height5 - marginalHighly indirect.. Infrequent coverage.L- and S-band SAR. Retrieved by spectral analysis of "imagettes". Boundary condition necessary for the retrieval
Dominant wave direction4 - fairInfrequent coverage.L- and S-band SAR. Variable measured by spectral analysis of "imagettes"
Dominant wave period4 - fairInfrequent coverage.L- and S-band SAR. Variable measured by spectral analysis of "imagettes"
Wave directional energy frequency spectrum4 - fairInfrequent coverage.L- and S-band SAR. Variable measured by spectral analysis of "imagettes"
Sea-ice elevation5 - marginalNo specific limitation.L- and S-band SAR. Sea ice elevation measured by interferometry
Sea-ice thickness5 - marginalChange detection only.L- and S-band SAR. Sea ice elevation measured by interferometry. Thickness inferred by ice model
Vegetation type4 - fairNo specific limitation.L- and S-band SAR
Fraction of vegetated land5 - marginalNo specific limitation.L- and S-band SAR
Biomass1 - primaryIndex only.. Infrequent coverage.Derived from differential effect of vegetation on L-band and S-band
Soil moisture (in the roots region)2 - very highInfrequent coverage.L- and S-band SAR
Soil moisture at surface2 - very highInfrequent coverage.L- and S-band SAR
Fire fractional cover3 - highInfrequent coverage.L- and S-band SAR. High resolution, for fire boundary detection
Snow water equivalent4 - fairChange detection only.. Infrequent coverage.L- and S-band SAR. SWE is retrieved by grigging with data from ground networks
Soil type5 - marginalNo specific limitation.L- and S-band SAR
Land cover5 - marginalNo specific limitation.L- and S-band SAR
Land surface topography2 - very highLong time for mapping.L- and S-band SAR for interferometry between images taken at time intervals
Glacier cover1 - primaryLong time for mapping.L- and S-band SAR for accurate boundary detection
Glacier motion2 - very highInfrequent coverage.L-band SAR for interferometry between images taken at time intervals
Glacier topography2 - very highLong time for mapping.L- and S-band SAR for interferometry between images taken at time intervals
Ice sheet topography2 - very highLong time for mapping.L- and S-band SAR for interferometry between images taken at time intervals