TwInvis Passive Radar for ATC

Primary air traffic surveillance without emission


  • Uses several existing VHF and UHF broadcasting signals (FM, DAB/DVB-T)
  • Weather independent surveillance
  • Remote controllable
  • Non-rotating 360° view  angle antenna
  • Easy maintenance, low footprint, low power consumption (<5 kW)
  • Scenario dependent system scalability
  • Interconnection of several sensors into a sensor cluster for increased coverage, accuracy and redundancy
  • Fixed installation or deployable radar system


HENSOLDT’s air traffic control solutions include innovative new developments as the TwInvis passive radar. TwInvis is a passive radar that adds a new dimension to the world of surveillance and situational awareness.

Where conventional radar systems all work using the same principle of emitting signals that are reflected by an object allowing the radar to visualise that object based on the echo received, TwInvis follows a radically different approach: The system uses the countless radio signals which are already in the air from broadcast and TV transmitters and evaluates their echoes when reflected by an aircraft.

It detects up to 200 aircraft in 3D within a radius of 250 km while keeping complete radio silence.

As a primary radar TwInvis does not require any cooperation from aircrafts to locate them. In addition, it operates without emission of own radar signal energy.

Several TwInvis can be linked up into a networked system so as to monitor even larger areas.

Our passive radar technology is also available as an air defence solution:

Go to Twinvis GBAD


  • 360° azimuth coverage, 3D tracking
  • Track updade rate <0.5 seconds
  • Range FM up to 250 km
  • 300-500m horizontal accuracy
  • ASTERIX data link
  • Ethernet-based communication
  • Encrypted control interface

Main Benefits

  • 3D aircraft detection in all flight levels using available broadcast transmitters
  • Stand-alone primary surveillance sensor without emission and no need for an official transmission licence – can operate within populated areas where active transmitters are no option
  • Wide area surveillance in sensor clusters, cost-efficiently complementing surveillance where conventional primary coverage is not sufficient

Product Impressions