Radio Navigation - Ground Radar

4 important questions on Radio Navigation - Ground Radar

Airport Surveillance Radar (ASR)

AKA Terminal Approach Radars (TAR) allows for ATC in local areas while also allwoing for (vectored) radar approaches. Antenna rotates at medium speed using medium wavelengths and PRFs
  • range of 50 - 80 NM
  • ability to penetrate intervening weather
  • good target discrimination capability

Route Surveillance Radar (RSR)

Allows for ATC along the airways in the upper airspaces. Antenna rotates at a low speed using relative large wavelengths and relative low PRFs
  • range of 200-300 NM
  • ability to penetrate intervening weather
  • moderate target discrimination capability

Surface Movement Radar (SMR)

AKA Airport Surface Movement Indicator (ASMI) or Aiport Surface Detection Equipment (ASDE), assist ground traffic controllers to maintain safe separation between aircraft and other ground vehicles on the ground.
For excellent target discrimination the antenna rotates at a high speed and uses relative small wavelengths and high PRFs.
Non-moving targets are filtered out by Doppler techniques.
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Precision Approach Radar (PAR)

Military predecessor of ILS/MLS
Used two sweeping antennas: one azimuth sweeping in the lateral plane and one elevation antenna sweeping in the vertical plane

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