page_title: Erieye
section_title: Design
hierarchical_section_title: Erieye / Design
caption_attribution_description: Royal International Air Tattoo 2013, Gloucestershire
context_page_description: The Erieye radar system is an Airborne Early Warning and Control System developed by Saab Electronic Defence Systems of Sweden. It uses active electronically scanned array technology. The Erieye is used on a variety of aircraft platforms, such as the Saab 340 and Embraer R-99. It has recently been implemented on the Bombardier Global 6000 aircraft as the Globaleye.
  The Erieye Ground Interface Segment is a major component of the software used by the Erieye system.
  The radar provides 300 degree coverage and has an instrumental range of 450 km and detection range of 350 km in a dense hostile electronic warfare environment—in heavy radar clutter and at low target altitudes. In addition to this, the radar is also capable of identifying friends or foes, and has a sea surveillance mode.
  The Erieye system has full interoperability with NATO air defence command and control systems.
context_section_description: The Erieye AEW&C mission system radar is an active, phased-array, pulse-doppler sensor that can feed an onboard operator architecture or downlink data (via an associated datalink subsystem) to a ground-based air defence network. The system employs a large aperture, dual-sided antenna array housed in a dorsal 'plank' fairing. The antenna is fixed, and the beam is electronically scanned, which provides for improved detection and significantly enhanced tracking performance compared with radar-dome antenna systems. Erieye detects and tracks air and sea targets out to the horizon, and sometimes beyond this due to anomalous propagation — instrumented range has been measured at 450 kilometres (280 mi). Typical detection range against fighter-sized targets is approximately 425 kilometres (264 mi), in a 150° broadside sector, both sides of the aircraft. Outside these sectors, performance is reduced in forward and aft directions.
  Other system features include:
  Adaptive waveform generation (including digital, phase-coded pulse compression); 
  Signal processing and target tracking; 
  track while scan (TWS); 
  low side lobe values (throughout the system's angular coverage); 
  low- and medium-pulse repetition frequency operating modes; 
  frequency agility; Air-to-air and sea surveillance modes; and 
  target radar cross-section display.
  The radar operates as a medium- to high-PRF pulse-Doppler, solid-state radar, in E/F-band (3 GHz), incorporating 192 two-way transmit/receive modules that combine to produce a pencil beam, steered as required within the operating 150° sector each side of the aircraft (one side at a time). It is understood that Erieye has some ability to detect aircraft in the 30° sectors fore and aft of the aircraft heading, but has no track capability in this sector.
caption: An Embraer R-99 Erieye
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