Navigation and Observation Systems
AMI 2700. Approach (APP) Terminal Area (TMA) Primary Surveillance Radar Antenna Subsystem

PURPOSE

AMI 2700 Antenna - is an High Directivity S-Band full offset feed antenna designed according to latest technologies to generate better reflector shape as well as state of art feeding system.

AMI 2700 Antenna complies with ICAO and EUROCONTROL requirements stated for ATC Sband Approach (APP) Primary Radar systems for Terminal Area Applications (TMA), featuring a dual MAIN and AUX beam configuration.

Both MAIN and AUX channels are provided with circular polarization capability to improve target detection in rain conditions.

AMI 2700 Antenna provides better than cosecant squared fan beam coverage up to 45 °(with hyper-directivity at angles > 25°), to improve overfly targets detection, and a tight slope at the horizon for MAIN and AUX beams.

MAIN and AUX beams, properly combined by the Receiver processor , can match any kind of ground clutter scenario under real-time clutter map control (Real Time Adaptability/ RTA).

INTERNATIONAL STANDARDS COMPLIANCE

  • EUROCONTROL radar surveillance in en-route and major terminal areas (TMA);
  • EUROCONTROL radar sensor performance;
  • ICAO Annex 10 Vol I section 3.2;
  • ICAO Annex 10 Vol I Att C;
  • ICAO Annex 10 Vol IV.
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MAIN TECHNICAL SPECIFICATIONS

  • Operating Band
    • 2700–2900 MHz
  • Polarization
    • Linear / Circular
  • Coverage (azimuth)
    • 360°
  • Coverage (elevation)
    • up to 45°
  • Rotation Rate
    • up to 15 rpm
  • Antenna Weight
    • ~1000 Kg
  • Dimensions (W x D x H)
    • 5.39 x 4.53 x 3.15 m
  • VSWR
    • 1.35 : 1
  • Power handling MAIN Ch.
    • 80 dB Max peak
    • 67dB Max average
  • Power handling AUX Ch.
    • 57 dB Max peak
    • 47dB Max average
  • Feed Type
    • Dual focus offset feeds systemй

MAIN beam

  • Antenna Gain
    • ≥ 35 dB
  • Beam Width
    • Horizontal 1.39°
    • Vertical 5°
  • Sidelobes
    • ≥ 27dB
  • Slope on the horizon at -3dB from the main peak
    • 4 dB/degree
  • Tilt angle
    • -2° to +5° manually controlled

AUX beam

  • Antenna Gain
    • ≥ 35 dB
  • Beam Width
    • Horizontal 1.39°
    • Vertical 5°
  • Sidelobes
    • ≥ 27dB
  • Squint angle Main/Aux beams
    • 3°±0,5°
  • Diagnostic
    • Integrated Test Transmitter Generator (TTG) dipole for full radar processing chain check up

ENVIRONMENTAL DATA

  • Temperature
    • -50 ÷ +70 °C
  • Humidity
    • up to 100%
  • Rain operation
    • 4 ÷ 102 mm per hour
  • Solar radiation
    • ≤ 360 BTU/hr/ft2 (1135 Watts/m2)

Wind conditions (operating)

  • Without ice
    • 240 km/h
  • With ice
    • 172 km/h – 10 mm ice

Wind conditions (survival)

  • Without ice
    • 329 km/h
  • With ice
    • 229 km/h – 40 mm ice
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