BackForwardInstrument:  SASS 

Instrument details
Acronym SASS
Full name SeaSat-A Scatterometer System
Purpose Sea surface wind
Short description Ku-band (14.599 GHz), side looking both left and right. 2 antennas on each side. Polarisations VV or HH
Background New development
Scanning Technique Pushbroom, two swaths of 500 km on each side cross-track (extended to 700 km in case of strong wind), gap of 400 km in between
Resolution 50 km
Coverage / Cycle Global in 1.5 days
Mass 103 kg Power 100 W Data Rate

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1978 to 1978-10-10
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
  • Scatterometer
Mission objectives
Primary mission objectives
  • Wind speed (near surface)
  • Wind vector (near surface)
Opportunity objectives
  • Leaf Area Index (LAI)
  • Sea-ice type
  • Snow 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
Leaf Area Index (LAI)4 - fairCoarse spatial resolution.Ku-band scatterometer sensitive to LAI
Sea-ice type1 - primaryNo specific limitation.Scatterometer, Ku-band (around 13.3 GHz). Type interpreted as age/roughness
Snow cover3 - highCoarse spatial resolution.. Thick snow only.Scatterometer in Ku-band (around 13.3 GHz)
Snow status (wet/dry)3 - highCoarse spatial resolution.. Thick snow only.Scatterometer in Ku-band (around 13.3 GHz)
Snow water equivalent5 - marginalCoarse spatial resolution.. Ground stations network needed.Scatterometer in Ku-band (around 13.3 GHz)
Soil moisture at surface3 - highCoarse spatial resolution.. Strongly affected by vegetation.Scatterometer in Ku-band (around 13.3 GHz)
Wind speed (near surface)1 - primaryOver sea only.Ku-band scatterometer around 13.3 GHz
Wind vector (near surface)2 - very highOver sea only.Ku-band scatterometer around 13.3 GHz