www.radartutorial.eu www.radartutorial.eu Card Index of Radar Sets - ATC-Radars

Description of the radar set, tactical-technical characteristics Описание; Основные тактико-технические характеристики (Базы данных)
ATC-Radar ASR 12
(click to enlarge: 308·429px = 14 kByte)

Figure 1: ATC-Radar ASR 12 (© Northrop Grumman)

Specifications
frequency: 2.7 to 2.9 GHz
pulse repetition time (PRT): processor controlled
pulse repetition frequency (PRF):  
pulsewidth (τ): 1 µs and 55 µs
receive time:  
dead time:  
peak power: 22 kW
average power:  
instrumented range: 60 / 80 / 100 NM
range resolution: 700 ft
beamwidth: 1.4 degrees
hits per scan:  
antenna rotation: 10 / 12 / 15 rpm.

ATC-Radar ASR-12

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 as a simple “state diagram.” There are two major transitions that occur during each pulse period:

These transitions are adjustable to allow optimization of the radar operation in the clutter conditions of the site.

high beam
low beam
high-beam
receiver
low-beam
receiver
power
divider
transmitter

Figure 2: Radarantenna with high- and low- beam pattern

high-beam receiver low-beam receiver power divider transmitter high-beam circulator low-beam circulator Feedhorn for „low-beam”- Chanel Feedhorn for „high-beam”- Chanel
high beam
low beam

Figure 2: Radarantenna with high- and low- beam pattern

long range
long range
short
range
short
range
short
range

Figure 3: Example of radar time line with different pulse-durations
In the lower elevation the radar radiates a number of „Short-Range-Pulses” in series. This is required for pulse-pair processing practicable in close-up range only.

long range
long range
short
range
short
range
short
range

Figure 3: Example of radar time line with different pulse-durations
In the lower elevation the radar radiates a number of „Short-Range-Pulses” in series. This is required for pulse-pair processing practicable in close-up range only.