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Air traffic is rapidly increasing and needs for controlling this are diversifying. In order to react to this situation, Toshiba, the first manufacturer of air traffic control & Navaids system in Japan, has consistently developed various kinds of solutions and equipments using advanced technologies.
We take pride in customers' trust as reflected, for example, in the fact that about half of surveillance radars installed in Japan has been supplied by Toshiba.

With a proven track record in a wide range of information systems and mechatronics products, Toshiba provides customer-oriented solution to the safety and reliability of air traffic management.
Now let's look at how each system and equipment in service works in series, that is, from take-off of an aircraft to landing.

Air Traffic Control Systems

Air Traffic Control Systems

When aircrafts take off, radars installed at airport start surveillance of the airplanes. Those radars are called Primary Surveillance Radar (PSR) and Secondary Surveillance Radar (SSR).

PSR detects distance and direction of aircrafts and these data are shown in a display installed in a control room.

SSR transmits interrogation signal and receives information regarding altitude and ID from the aircrafts as a reply.

These data derived from PSR and SSR contribute to air traffic management.

In recent years, Mode S for SSR is becoming popular. Toshiba SSR supports Mode S, which can respond to dramatic increase of air traffic by transmitting interrogation signal independently to plural aircrafts.

Now, an aircraft leaves airport and enters into next phase: en-route traffic control.

It is essential for safety of an aircraft to have precise information about where it is flying.
Necessary data is presented by VOR (VHF Omni-directional Radio Range) and DME (Distance Measuring Equipment).

VOR transmits two kinds of signals. One is a radio wave that shows magnetic North, and the other is a rotating signal with directivity.
Time difference between these two gives a heading of the aircraft to a pilot.

DME, used in conjunction with VOR in general, provides an aircraft with distance from DME to the plane.
Thanks to VOR and DME, each aircraft can make an en-route flight as planned.

PSR and SSR can be installed not only at airports but also along en-route.

When PSR/SSR is located on top of a mountain adjacent to en-route, it can give position of each aircraft flying along en-route to control room located far from there.

Last phase: Approach.
PSR/SSR and VOR/DME installed at airport assist secure landing of aircrafts.

In addition to these, Toshiba supplies Terminal Doppler Weather Radar (TDWR) for the observation of wind around an airport, to be more specific, microburst and wind shear which is hazardous for aircrafts during take-off and landing.

Our TDWR is based on the weather radar, and is able to respond to the various requests from customers regarding Products for Airport use.

As described above, Toshiba supplies a wide variety of systems and equipments which are indispensable for all aspects of air traffic control.

Toshiba will continue to contribute to the safety and further development of the world skies making full use of its rich track record and expertise.

Applicable Standards

  • ICAO Annex 10
  • EUROCAE ED-52 and 57
  • R & TTE Directive
  • ITU-R SM, 1541-2 Annex 8
  • ISO 9001

Supply Record

Toshiba has delivered PSR/SSR and VOR/DME for more than 60 years.

Number of systems Toshiba delivered

Domestic market 101 385
Overseas market 34 158

As of September 2014


  • Sep. 29, 2014Other

    Air Traffic Control and Navaids System web site is renewed.

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