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ATC-Radar ASR-12
Figure 1: ATC-Radar ASR 12
(© Northrop Grumman)
NORTHROP GRUMMAN
The Northrop Grumman ASR-12 is a modular, fully solid-state
S-Band
radar system that incorporates
the latest technologies in airport surveillance radar systems. It is a further development of the
ASR-9
and also uses the same reflector, a curved metal latticework 36 feet wide and 17 feet tall.
Weather conditions detected by the ASR-12 are measured in six levels of intensity conforming to the ICAO standards and are processed using a weather channel processor separate from the aircraft channel.
The operation of the ASR-12 is depicted on the left as a simple „state diagram.” There are two major transitions that occur during each pulse period:
- Short to long pulse transition in high beam
- High beam to low beam transition using the long pulse
These transitions are adjustable to allow optimization of the radar operation in the clutter conditions of the site.
| Specifications | |
|---|---|
| frequency: | 2.7 to 2.9 Gigahertzes |
| pulse repetition time (PRT): | processor controlled |
| pulse repetition frequency (PRF): | |
| pulsewidth (PW): | 1 Microsecond and 55 Microseconds |
| receive time: | |
| dead time: | |
| peak power: | 22 kilowatts |
| average power: | |
| displayed range: | 60 / 80 / 100 NM |
| range resolution: | 700 ft |
| beamwidth: | 1.4 degrees |
| hits per scan: | |
| antenna rotation: | 10 / 12 / 15 rpm. |
