SURVEILLANCE

In ARMATS CJSC the provision of radar information for ATC centers and stations is carried out by the aerodrome radar system “IRTISH”, as well as the en-route radar system “TRLK-11” and the multilateral control system P3D. Each of these systems, except the P3D, consists of two radars, primary and secondary.

Gyumri and Stepanavan airports operate DRL-7CM aerodrome control radars. The SURVEILLANCE (Radiolocation) service of “ARMATS” is responsible for the uninterrupted performance of aerodrome radar system “IRTISH” and en-route radar system “TRLK-11”.
The SURVEILLANCE service is staffed with highly qualified engineering and technical personnel.

The main tasks of the service are:

Organization of high quality and uninterrupted provision of radar information for the control units and ATC standby room.
Organization and implementation of the technical operation of radar stations.

In addition to “IRTISH” aerodrome radar system, en-route radar system “TRLK-11”, and multilateral control system P3D , the Surveillance Service of “Zvartnots” Airport includes the ATC standby room, VHF stations, and emergency power sources.
From 1984 to 1998 the information from these systems was transferred to the equipment AS ATC “START”. Since 2000 it is being transferred to EUROCAT-1000.

From 1995 to 2007 “IRTISH” aerodrome radar system underwent step-by-step modernization, in particular:

Replacement of primary and secondary channel equipment.
Replacement of “APOI C2” with APOI “KORC” with possibility of synchronizing the tick time UTC from GPS and transmission of radar information in “ASTERIX” format.
Installation of radar blanking system (RBS) for suppression of false signals that occur in result of reflection from the local objects.
Repair of antenna system installing an antenna of upper beam.
Replacement of the lamp high and intermediate-frequency amplifier (IFA) of the second channel with the solid-state devices.
Replacement of lamp receivers of the first channel with the solid-state devices.
Installation of circulators in place of RR64 RR65 protectors in the primary channel.
Installation of 30kw UPS to provide uninterrupted performance of the radar system
Installation of ARM CI “Prior” equipment to provide the display, registration, record and statistical processing of the radar information, as well as of the information on the technical state of the radar station’s equipment.

The surveillance system “TRLK-11” was installed in v. Hovtashat, 10 kilometers off the airport “Zvartnots”. It was put into operation in 2000.
The following equipment have been modernized in “TRLK-11”

Replacement of “APOI C2” with APOI “PRIOR” with modification aimed at synchronizing the tick time UTC from GPS and transmission of radar information in “ASTERIX” format.
Replacement of MTD with MTD “PRIOR”.
Replacement of the lamp intermediate-frequency amplifier (IFA) of the second channel with the solid-state devices
Modernization of high voltage power supply unit SV-202 of “Koren S” equipment.
Modernization of general power supply scheme with the solid-state devices converters.
ARM CI “Prior” equipment has been installed to provide the display, registration, record and statistical processing of the radar information, as well as of the information on the technical state of the radar station’s equipment.
Modernization of the units and blocks of the primary channel was realized for extension of the operating time of klystrons KIU-98A, KIU-98B

In 2005 two multilateral control systems P3D with centers in “Zvartnots” and “Shirak” airports were installed, and in 2007 were introduced into technical operation.

The principle of the P3D system function is based on the differential of receiving aircraft responding signals by eleven receiving stations, which are situated in the territory of the Republic of Armenia.

The signals received by the receiving stations in the real time scale are transferred through microwave radio relays to the central station and further through the coaxial cable in to data processor.

With the help of the measurement block and the software the data processor diagnoses and decodes the code groups of the secondary response and estimates the odds between the arrival of the corresponding code groups with respect to different positions. The position (location) of the aircraft, including its geometrical height is estimated based upon the detected differences of the time of arrival of the pulse (the hyperbolic delay).