Communication and Navigation System

Voice Communications System (VCS)

Voice Communication System is a state-of-art solution for ATC communication. Based on voice-over-ip technology, it allows effective interconnection of multiple communication system including UHF and VHF radios, telephones, and intercoms.

Key benefits:

  • Simple data network infrastructure instead od dedicated cabling and wiring
  • COTS hardware instead of fragile, expensive and difficult to get electronics
  • Fully digital chain from the operator to the transceiver and vice versa
  • Monitoring and data sharing in the country-wide network
  • Instantaneous back-up with control transfer to an adjacent location

Digital Automatic terminal information service

D-ATIS, is a continuous broadcast of recorded non control aeronautical information in busier terminal (i.e. airport) areas. ATIS broadcasts contain essential information, such as weather information, which runways are active, available approaches, and any other information required by the pilots, such as important NOTAMs. Pilots usually listen to an available ATIS broadcast before contacting the local control unit, in order to reduce the controllers' workload and relieve frequency congestion.


Digital Voice Recorder

Air-safety companies use DVR systems for recording data and speech to-:

  • Fulfill the conditions of ICAO Annex 10, Volume 2, Chapter 3, Paragraph 3.5
  • Have evidence appropriate for use in a court of law
  • Be able to provide even better training for air-traffic controllers
  • Retrieve items of communication quickly and
  • Archive them reliably and protect them against manipulation

DVR system has a Modular design enabling a recording of functionally unlimited number of voice channels (field proven installation with 1200 channels of various types).It offers round-the-clock operation and recording of various types of voice channels - analogue (phone lines, ambient sound, radios, etc.), digital (E1 interface, ISDN PRI/BRI), VoIP.


Instrument Landing System

The Instrument Landing System (ILS) provides a means for safe landing of aircraft at airports under conditions of low ceilings and limited visibility. The use of the system materially reduces interruptions of service at airports resulting from bad weather by allowing operations to continue at lower weather minimums. The ILS also increases the traffic handling capacity of the airport under all weather conditions.


Distance Measuring Equipment

Distance Measuring Equipment is a vital navigational Aid, which provides a pilot with visual information regarding his position (distance) relative to the ground based DME station. The facility even though possible to locate independently, normally it is collocated with either VOR or ILS. The DME can be used with terminal VOR and holding VOR also. DME can be used with the ILS in an Airport; normally it is collocated with the Glide path component of ILS.



It is a type of radio navigation system for aircraft. VORs broadcast a VHF radio signal encoding both the identity of the station and the angle to it, telling the pilot in what direction he lies from the VOR station, referred to as the radial.It operates in the VHF band of 112-118 MHz, used as a medium to short range Radio Navigational aid. It works on the principle of phase comparison of two 30 Hz signals. There are two types of VOR, namely, conventional VOR (C-VOR) and Doppler VOR (D-VOR).


Advanced Surface Movement Guidance and Control System

A system providing routing, guidance and surveillance for the control of aircraft and vehicles in order to maintain the declared surface movement rate under all weather conditions within the aerodrome visibility operational level (AVOL) while maintaining the required level of safety.


Automatic dependent surveillance – broadcast (ADS–B)

It is a surveillance technology in which an aircraft determines its position via satellite navigation and periodically broadcasts it, enabling it to be tracked. The information can be received by air traffic control ground stations as a replacement for secondary radar. It can also be received by other aircraft to provide situational awareness and allow self separation.ADS–B is "automatic" in that it requires no pilot or external input. It is "dependent" in that it depends on data from the aircraft's navigation system.


Airport surveillance radar/Mono Secondary Surveillance Radar

An airport surveillance radar (ASR) is a radar system used at airports to detect and display the position of aircraft in the terminal area, the airspace around airports. The sophisticated systems at large airports consist of two different radar systems, the primary and secondary surveillance radar. The primary radar typically consists of a large rotating parabolic antenna dish that sweeps a vertical fan-shaped beam of microwaves around the airspace surrounding the airport. It detects the position of aircraft by microwaves reflected back to the antenna from the aircraft's surface. The secondary surveillance radar consists of a second rotating antenna, often mounted on the primary antenna, which interrogates the transponders of aircraft, which transmits a radio signal back containing the aircraft's identification and altitude which is displayed on the radar screen next to the return from the primary radar.