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

<https://gcmd.earthdata.nasa.gov/kms/concept/942876b3-fbd5-43d9-9e1f-170682f7b5b3>
  skos:prefLabel "Laser Ranging"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/36ea978b-6de3-4115-9094-87364cf1217f> .

<https://gcmd.earthdata.nasa.gov/kms/concept/36ea978b-6de3-4115-9094-87364cf1217f>
  skos:definition """A LASER TRACKING REFLECTOR is an object that reflects incident energy; usually a device designed for specific reflection characteristics such as tracking (observing patterns) with laser technology.

[With regard to the LAGEOS Missions, Text From National Space Science Data Center, http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1976-039A-01 ]

Laser retroreflectors covering a very dense spherical satellite were used to provide a permanent reference point in a very stable orbit for precision earth-dynamics measurements. This sphere was machined largely from depleted uranium, weighed about 411 kg, and was composed of a cubical inner core with six attached spherical caps. Each of the spherical caps had machined cavities to accommodate the retroreflectors. The satellite was placed at a high orbital inclination at an altitude of about 5000 km and tracked by a network of 13 laser stations operated by both U.S. and foreign agencies. The performance in orbit is limited only by degradation of the retroreflectors, and a minimum lifetime of 50 years is expected. 


Group: Instrument_Details
   Entry_ID: LASER TRACKING REFLECTOR
   Group: Instrument_Identification
      Instrument_Category: Earth Remote Sensing Instruments
      Instrument_Class: Passive Remote Sensing
      Instrument_Type: Positioning/Navigation
      Instrument_Subtype: Laser Ranging
      Short_Name: LASER TRACKING REFLECTOR
   End_Group
   Group: Associated_Platforms
      Short_Name: LAGEOS-2
      Short_Name: LAGEOS-1
   End_Group
   Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1976-039A-01
   Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1992-070B-01
End_Group"""@en ;
  skos:prefLabel "LASER TRACKING REFLECTOR"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/942876b3-fbd5-43d9-9e1f-170682f7b5b3> ;
  a skos:Concept .