Recall: RADAR = RAdio Detection and Ranging (i.e. what's out there, which direction, and how far away?)
Primary Returns
- computes target positions by determining range and azimuth of reflected radio frequency energy
- passive - does not rely on info from aircraft
- uses:
- TSR (terminal surveillance radar) - short range (80 NM) to complement SSR
- PAR (Precision Approach Radar) - approach aid
- ASDE (Airport Surface Detection Equipment) - high def for aircraft and vehicles on manoeuvring areas
- Weather Radar - monitor hazardous weather conditions
Secondary Returns
- determines aircraft range by measuring the interval between transmitting an interrogation to and receiving a reply from an airborne transponder
- uses:
- enroute control - long range (200 NM)
- terminal control - in conjunction with PSR
ADS-B (Automatic Dependent Surveillance - Broadcast)
- uses aircraft avionics, satellites and/or ground infrastructure to relay a range of aircraft parameters to ATC
- automatic (no external stimulus required) but dependent (relies on aircraft avionics)
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