A400 Series Air Security Radars

  • Medium-range air security radars (ASR) for detection of covert air targets
  • Detects and reports micro, mini or standard drone types
  • Provides indication of drone altitude
  • 10 m to 10 km detection range
  • 90° to 360° horizontal scanning options
  • Advanced PESA e-scan and FMCW technology for ultra-high reliability
  • Digital Drone Detection (D³) technology with sensitivity boost
  • Unsurpassed clutter suppression for near horizon and urban operation
  • Full volumetric air coverage using optional Blighter Radar Tilting System (BRTS)
  • Drone Spotlighting Mode

A400 series radars are optimised for the detection of small UAVs carrying video cameras, wireless communication systems, narcotics, explosives and other undesirable payloads. Read More

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Blighter’s A400 series range of air security radars build on the heritage of its successful Blighter B400 series ground surveillance radars. A400 series radars are modular non-rotating, electronic-scanning (e-scan) systems using power efficient PESA (passive electronically scanned array) and FMCW (frequency modulated continuous wave) technologies to provide reliable, small and slow drone (UAV, UAS, RPV) detection even in complex environments.

A400 series radars are optimised for the detection of small drones carrying video cameras, wireless communication systems, narcotics, explosives and other malicious payloads. A400 series radars use D3 (Digital Drone Detection) technology that enables them to extract the tiny radar reflections from modern plastic bodied UAVs even when flying close to the ground or near buildings where clutter reflections are relatively large. Blighter’s Ku-band operating frequency is ideally suited to detecting the small structures used to construct compact UAVs such as the control wires, battery pack, motor and wireless communications system.

Configuration Options

The A400 series radars are offered in three configurations. The Blighter A402 radar covers a horizontal azimuth scan sector of 90°, the Blighter A422 radar covers 180° and for 360° surveillance a dual-A422 back-to-back configuration can be used. Vertical elevation coverage is selected by use of either the W20S antennas (20° standard or 30° extended coverage) or the M10S antennas (10° standard or 15° extended coverage). An optional BRTS (Blighter Radar Tilting System) allows the A400 radar to provide increased volumetric air coverage combined with drone altitude indication.

Detection Performance

A400 series radars are capable of detecting microdrones at ranges from 10 m up to 2.4 km and larger drones and aircraft at ranges up to 10 km. Drone speeds ranging from hover-drift to over 400 km/h are all detected. Target tracking software and extensive zone filtering facilities allow drones to be detected while reducing false alarms from birds.

Architectural Overview

  • Radar type: E-scan Frequency Modulated Continuous Wave (FMCW) Doppler Air Security Radar
  • Frequency band: Ku band
  • Spectrum occupancy: 15.7 to 17.2 GHz
  • Scan type: fully electronic scanning in azimuth (‘e-scan’) using a Passive Electronically Scanned Array (PESA)
  • Transmitter power (nominal): 4 Watt
  • Multi-radar operation: supported and unlimited
  • Embedded software and firmware: field upgradeable via network connection

Target Detection Performance

  • Maximum detection ranges:
    • Micro Air Vehicle (MAV): 2.4 km (1.5 mi.)*
    • Miniature UAV: 3.6 km (2.2 mi.)*
    • Compact UAV: 6.0 km (3.7 mi.)*
    • Manned hang-glider: 9.0 km (5.6 mi.)*
    • Standard UAV: 10.0 km (6.2 mi.)*
  • Maximum targets per scan: 700
  • False Alarm Rate (FAR): 1 false alarm per day (adjustable)
  • Minimum detectable target radial velocity: 0.37 km/h (0.23 mph)

*A400 series radar with M10S antennas. UAV detection ranges are highly dependent upon construction of the airframe and of the onboard electronics and payload.


  • Instrumented maximum range: 10 km (6.2 mi.)
  • Instrumented minimum range: less than 10 m (33 ft.)
  • Azimuth scan angle: 90° (A402), 180° (A422) or 360° (Dual A422) horizontal e-scan
  • Elevation beam: 10° or 20° vertical beamwidth
  • Fastest scan time (for 90°): 1.0 s
  • Fastest scan time (in Drone Spotlighting Mode): 0.25 s

Connectivity & Software

  • Main I/O interface (for radar control and target data): 10/100 Ethernet network interface
  • Auxiliary I/O interfaces: RS-232 and RS-422 control lines, opto-isolated control/status inputs and isolated switched contact outputs
  • Software (SDK): API software library (Windows) and generic Interface Control Document (ICD) are both available to System Integrators


  • Battery/regulated-PSU input range: from 12 V to 28 V (DC)
  • Vehicle supply input range: from 12 V to 24 V (DC)
  • Power consumption (from 12 V regulated-PSU): 96 W (average)

Physical, Environmental & Reliability

  • External dimensions of radar unit(s) (W x H x D)*: 666 mm x 503 mm x 128 mm (26.2 in. x 19.8 in. x 5.0 in.)
  • Weight of main radar unit (approx.)*: 25 kg (55 lb.)
  • Weight of auxiliary radar unit(s) (approx.)*: 21 kg (46 lb.)
  • Operating temperature: from -32° C to +60° C (from -25° F to +140° F)

Note: extended operating temperature version available

  • IP rating: IP66 (dust tight and protected against powerful water jets)
  • MTBF: > 65,000 h

* excluding antennas, mountings and solar shield

Errors and omissions excepted. Blighter Surveillance Systems Ltd reserves the right to modify specifications without notice. Blighter radars are protected by a number of international patents. The Blighter name is an international registered trademark.

BSS-1307 ©2019 Blighter Surveillance Systems Ltd