@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<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/9a351e42-4f5c-4d6b-b51f-152c513ad3ff> .

<https://gcmd.earthdata.nasa.gov/kms/concept/9a351e42-4f5c-4d6b-b51f-152c513ad3ff>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """Radar instrumentation consists of (1) a duel-mode very high-frequency (VHF) (120 to 300 MHz) synthetic-aperture radar (SAR) that can operate in bistatic or monostatic mode for simultaneously measuring ice thickness, mapping internal layers at depth and imaging the ice-bed interface, and (2) an ultra high-frequency (UHF) ultra-wideband radar (500 to 2000 MHz) for fine-resolution mapping of near-surface internal layers. One important application of the SAR is the determination of basal conditions, particularly the presence and distribution of basal water. Basal water lubricates the ice/bed interface, enhancing flow, and increasing the amount of ice discharged into the ocean. Another application of the SAR will be to measure ice thickness and map internal layers in both shallow and deep ice. Information on near-surface internal layers will be used to estimate the average, recent accumulation rate, while the deeper layers provide a history of past accumulation and flow rates. A tracked vehicle and an automated rover was used to test and demonstrate the utility of an intelligent radar in glaciological investigations.

The system was developed to collect, process and analyze data in real time, and to use a priori information derived from archived sources for decision making. The combined real time and archived information can be used onboard the vehicles to select and generate an optimum sensor configuration. This project thus involves innovative research in intelligent systems, sounding radars and ice sheet modeling. In addition it has a very strong public outreach and education program, which include near-real-time image broadcasts via the world wide web 


Group: Instrument_Details
   Entry_ID: IMAGING RADAR SYSTEMS
   Group: Instrument_Identification
      Instrument_Category: Earth Remote Sensing Instruments
      Instrument_Class: Active Remote Sensing
      Instrument_Type: Imaging Radars
      Short_Name: IMAGING RADAR SYSTEMS
      Long_Name: Imaging Radar Systems, Real and Synthetic Aperture
   End_Group
   Group: Instrument_Associated_Sensors
      Short_Name: Wideband UHF radar
      Short_Name: SAR
      Short_Name: RADAR ECHO SOUNDERS
   End_Group
   Group: Associated_Platforms
      Short_Name: FIELD SURVEYS
      Short_Name: FIELD INVESTIGATION
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Microwave
      Number_Channels: 1
      Spectral_Frequency_Coverage_Range: 120 - 300 MHz
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Microwave
      Number_Channels: 1
      Spectral_Frequency_Coverage_Range: 500 - 2000 MHz
   End_Group
   Online_Resource: https://www.cresis.ku.edu/
   Sample_Image: http://www.cresis.ku.edu/images/SAR_radar.jpg
   Creation_Date: 2007-12-04
   Group: Instrument_Logistics
      Data_Rate: 18 Mbps
      Instrument_Start_Date: 2005-07-20
      Instrument_Stop_Date: 2005-07-23
      Instrument_Owner: Prasad Gogineni
   End_Group
   Group: Instrument_Logistics
      Data_Rate: 18 Mbps
      Instrument_Start_Date: 2006-01-01
      Instrument_Stop_Date: 2006-01-10
      Instrument_Owner: Prasad Gogineni
   End_Group
End_Group"""@en ;
  skos:prefLabel "IMAGING RADAR SYSTEMS"@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 .