ELECTRONICS SERVICES

The DHMİ (General Directorate of State Airports Authority) Electronics Department is the main supporter of the Air Navigation Department in providing a Civil Air Navigation Service for Turkey.

The DHMİ Electronics Department is responsible for the following tasks:
- to provide and install navigation aids, radar systems, communication systems, terminal systems and computer systems related to Flight Safety and to provide continuity of these systems,
- to formulate the projects and technical specifications of the required electronic systems and equipment; to prepare the periodic overhaul and maintenance plans of existing systems; to perform and monitor these plans,
- to define the software requirements of DHMİ's computer systems, to analyze the systems,
- to set up a ground team to work on the flight control of the Navigation, Radar and Communication systems and to assign work to this team,
- to renew, repair, calibrate and modify the systems and test equipment in the Main Electronics Workshop that cannot be repaired in the airports and Navigation Aid Stations of the airports; to provide necessary stand-by equipment, test equipment and documentation; to plan and perform domestic and international training related to these services; to follow the latest technological advances in order to provide a better service and to implement these improvements,
- to follow the studies of international aviation institutions (ICAO, Eurocontrol, ECAC, etc.), to coordinate and cooperate with the related units to perform the prepared and approved plans in time; to draw up plans and programs when needed.

REVOLUTION IN AVIATION COMMUNICATION
Turkey has attained the capability to provide an uninterrupted service utilizing complementary VSAT and TDM networks.
The State Airports Authority (DHMİ) endeavors to provide a 24-hour uninterrupted service, operating the systems to international tolerances. The security and continuity of all the Communications and Navigation Aid Devices/Systems that serve in the management of traffic control in Turkey's airspace and airports are supervised and evaluated by international organizations (ICAO, ECAC, Eurocontrol, FAA etc.).

The controls and determinations of the international organizations regulate the level of compliance of Turkey. These have a direct affect on tourism, trade, external affairs and the revenue of Turkey and define the class and category of Turkish Civil Aviation Flight, Passenger Security and Safety. Thereby, Air/Ground Communications and an uninterrupted flow of radar data are of vital importance.

To this end, a backup circuit utilizing satellite channels (VSAT) for every station is in place, working in parallel to the TDM communication environment (continental circuit). This links the Air/Ground Transceivers of the stations and radars to the Air Traffic Control Centers. The aim of this backup circuit is to ensure an uninterrupted, reliable, qualified voice and data communication network between the main center at Esenboğa Airport, the Air Traffic Control Centers at İstanbul, İzmir and Antalya and 16 Air/Ground and radar stations within Turkey.

A protocol has been signed between Turkish Telecom and DHMİ to generate a network that will work via the TURKSAT satellite, connecting the UHF/VHF Air/Ground Transceivers, radars and voice and data from DHMİ's 16 stations with the Air Traffic Control Centers in Esenboğa and other airports.

The installation of satellite ground stations has been completed at the Esenboğa, İstanbul (Atatürk), İzmir (Adnan Menderes) central stations; and at the Burdur/Kuyutepe (Esenboğa, Antalya, İzmir connected), Yalova/Dumanlıtepe(İstanbul, Esenboğa connected), Erzincan/Karadağ, Şanlıurfa/Korçik, Dalaman, Kahramanmaraş/Gökçedağ, Karaman/Ermenek, İzmir/Akdağ(İstanbul, İzmir connected), Bodrum-Milas, Batman/Beşiri, Van, Merzifon/Yumrutepe, Erzurum/Kargapazarı, Bartın, Sivas and Uşak stations.

Thus, a network has been created linking all Air Ground Transceiver/Radar Stations and Air Traffic Control Centers, and an uninterrupted communication service has been provided between aircraft flying over Turkish airspace and the Air Traffic Control Centers through a dedicated stand-by VSAT network, working in parallel to the continental TDM network. (As shown in the diagram)

Conversations with pilots, position, speed and altitude data related to aircraft, flight routes and air space data can all be communicated without interruption over TDM and via satellite. All the voice and radar data obtained from remote stations can be gathered at the Air Control Centers, and the landing/take-off of aircraft, monitoring of transit aircraft and communications of the aircraft can be accomplished more safely and easily. In case of any system problems, interruption of service or national disasters, such as earthquake or flood, communications and tracking in Turkish Air space can continue without interruption by switching over to the independent back-up communication environment utilizing the TURKSAT satellite.

Uninterrupted communication has been provided by replacing the low voice quality analog lines, which have low speed, high maintenance and are susceptible to background noise, with state-of-the-art digital communications and by providing alternative communication environments. At the same time a financial saving of over 700% has been achieved.

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