@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/1c53d85e-3792-4081-9748-192fd3140aa6>
  skos:changeNote """2015-02-05 14:52:16.0 [mpmorahan] Insert Concept 
add broader relation (SENTINEL-1 C-SAR [1c53d85e-3792-4081-9748-192fd3140aa6,106721] - Imaging Radars [824070fa-da29-40fa-ba17-f3d60584bd4d,75765]); 
""", """2019-02-22 13:49:57.0 [mmorahan]  
insert WeightedRelation (id: null
related concept uuid: c7279e54-f7c1-4ee7-a957-719d6021a3f6
relationship type: null
relationship value: null
generated by: null); 
insert WeightedRelation (id: null
related concept uuid: 9940dbad-1a9a-4858-a0e8-af35b21277e2
relationship type: null
relationship value: null
generated by: null); 
""", """2019-03-28 12:55:37.0 [mmorahan]  
delete WeightedRelation (null); 
delete WeightedRelation (null); 
""" ;
  skos:definition """The C-SAR instrument is an active phased array antenna providing fast scanning in elevation (to cover the large range of incidence angle and to support ScanSAR operation) and in azimuth (to allow use of TOPS technique to meet the required image performance). To meet the polarisation requirements, it has dual channel transmit and receive modules and H/V-polarised pairs of slotted waveguides.

It has an internal calibration scheme, where transmit signals are routed into the receiver to allow monitoring of amplitude/phase to facilitate high radiometric stability.

SENTINEL-1's metallised carbon-fibre-reinforced-plastic radiating waveguides ensure good radiometric stability even though these elements are not covered by the internal calibration scheme. The digital chirp generator and selectable receive filter bandwidths allow efficient use of on-board storage considering the ground range resolution dependence on incidence angle.


Group: Instrument_Details
   Entry_ID: SENTINEL-1 C-SAR
   Group: Instrument_Identification
      Instrument_Category: Earth Remote Sensing Instruments
      Instrument_Class: Active Remote Sensing
      Instrument_Type: Imaging Radars
      Short_Name: SENTINEL-1 C-SAR
   End_Group
   Group: Associated_Platforms
      Short_Name: SENTINEL-1
   End_Group
   Online_Resource: https://sentinel.esa.int/web/sentinel/sentinel-1-sar-wiki/-/wiki/Sentinel%20One/Instrument
   Creation_Date: 2015-02-05
End_Group"""@en ;
  skos:prefLabel "SENTINEL-1 C-SAR"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/824070fa-da29-40fa-ba17-f3d60584bd4d> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/824070fa-da29-40fa-ba17-f3d60584bd4d>
  skos:prefLabel "Imaging Radars"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/1c53d85e-3792-4081-9748-192fd3140aa6> .