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ASMI-18X

Description of the radar set, tactical-technical characteristics

Figure 1: ASMI-18X on the ATC-tower of London Gatwick Airport, West Sussex, Great Britain
(© 1982 N. Chadwick, cc-by-sa/2.0)

Figure 1: ASMI-18X on the ATC-tower of London Gatwick Airport, West Sussex, Great Britain
(© 1982 N. Chadwick, cc-by-sa/2.0)

Specifications
frequency: 9 410 MHz
(X-band)
pulse repetition time (PRT): 250 µs
pulse repetition frequency (PRF): 4 kHz
pulsewidth (τ): 40 ns
receiving time: 54 µs
dead time: 196 µs
peak power: 20 kW
average power: 200 W
instrumented range: 8 km
range resolution: 6 m
accuracy:
beamwidth: 0.43°
hits per scan:
antenna rotation: 60 rpm
MTBCF:
MTTR:

ASMI-18X

ASMI-18X (Airport Surface Movement Indicator) is operating in the X-band surface movement radar.

The antenna is an 18 feet wide (≙ 5.5 m) slotted waveguide radiator horizontally polarized and providing 36 dB gain and fan-beam pattern with a vertically opening of 15 degrees. The radar’s sensitivity is sufficient to detect a crawling person at 2 km on the runways, and the resolution is sufficient to clearly show the shape of large aircraft.

This radar was developed by RACALL Avionics in 1980.

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