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Application

The Automated Transmitting and Receiving Center (ATRC) TRS 2000 is designed to provide fixed radio communication channels between dispatchers and aircraft crew to the benefit of the Unified System of Air Traffic Management of the Russian Federation (USATM RF). Suitable for installation both to stationary radio facilities or containers, the ATRC is available in different hardware configurations:

• separated transmitting and receiving radio centers;
• combined transmitting/receiving radio center.

The combined transmitting/receiving radio centers represent a conceptually new design approach to radio communication solutions for air traffic management. Such approach offers the possibility to accommodate transceivers and receivers in single facility or cabinet, install antennas within a limited space and guarantee adequate electromagnetic compatibility. Also, this solution enables to reduce cabling (cables needed for single location only), land lease costs, operational expenses and necessary auxiliary equipment.

ATRC features and capabilities

• Enables simultaneous independent operation of 2-46 voice communication channels.
• Enables redundancy of radio communication hardware and antenna-feeder lines by connecting radio communication hardware to different filtering and isolating devices.
• Provides remote control and monitoring capabilities.
• Reduces maximum communication failure time of any radio communication channel to 3 seconds (caused by radio communication hardware malfunction, ATRC hardware malfunction or power failure).
• Ensures continuous operation monitoring for each transmitter in transmission mode and prevents it from continuous operation in this mode, if control channel of radio communication hardware failed.
• Enables multiple receivers and transmitters to share single antenna.
• Requires no line maintenance (ATRC nor associated hardware).
• Provides automatic monitoring of all ATRC basic parameters and fault location down to standard spare components level through advanced integrated test system.
• ATRC's delivery package includes cabinet fitted with HVAC, fire alarm and intrusion detection system, gas fire extinguishing system.

Hardware installation

The hardware locates in standard 19" racks according to IEC 60297.

• PPM rack for radio receivers, radio transmitters, transceivers and radio terminals.
• MK rack for MV filters and combiners.
• DU rack for RCE 2000 remote control hardware.

Transmission mode activation

From external system side, any ATRC channel can be switched to transmission mode in a following way:

• by DC voltage signal (between +5VDC and +35VDC) applied to central point of transformer at modulating signal side;
• by DC voltage signal (between +5VDC and +35VDC) applied to separate control line;
• by closing transformer central point to ground at modulating signal side;
• by closing separate control line to ground.
• via E&M type V interface.

Control signal type depends on application requirements.

Control and monitoring

Dedicated remote control hardware (RCH), that shall be located in Air Traffic Management Facility, provides remote control and monitoring capabilities for ATRC. This hardware provides collection, processing and display of data associated with technical condition of maximum 40 ATRCs as well as manages their hardware configuration. Also, ATRC's radio communication hardware offers certain additional capabilities to meet demands of different applications.

Carrier frequency offset (offset mode)

To ensure uniform radio communication coverage over irregular terrain (e.g., highlands), repeaters may be used. If repeater frequencies are offset regarding primary radio communication equipment frequencies, then dispatcher pressing PTT switch of single radio communication channel causes remote transmitters, operating with offset frequency, to activate transmission mode and aircraft crew will receive all incoming signals without distortions. For frequency spacing of 25 kHz, the following transmit and receive carrier frequency offset values are available: ±4 kHz and ±6 kHz.

Continuously operating channels

To meet continuous transmission requirements, e.g., «Meteo» channel, ATRC incorporates radio communication equipment that ensures 24-hours channel operation in «Transmission» mode.

Battery power supply

Regulation documents require Air Traffic Management Systems to incorporate backup radio communication equipment operating from chemical power sources. The most cost effective approach calls for connection of radio communication equipment both to AC and DC power supply. If AC power supply fails, radio communication equipment automatically switches to chemical power source without any communication interruption or transmitter capacity reduction.

Duplex mode and repeater mode with transceiver

Any single transceiver may use simplex, semi duplex and duplex mode provided that receiver and transmitter incorporates individual synthesizers. In this case receiver and transmitter, each connected to own antenna, enables to use duplex mode and repeater mode.

Intermodulation interference and spurious radiation

Typically, complex ATRCs utilizing many frequencies encounter various intermodulation interference problems. In order to meet EMC requirements as well as to minimize intermodulation interference and spurious radiation, advanced radio communication equipment incorporates dedicated circulators reducing third-order intermodulation interference to 65dB and band-pass filters suppressing out-of-range radiation to - 44dB.

TRS 2000 main specifications
Frequency range
enroute sector (VHF range)
— for frequency spacing 25 kHz:	118.000 MHz to 136.975 MHz
— for frequency spacing of 8.33 kHz:	118.0000 MHz to 136.9916 MHz
out-of-route sector (VHF/VHF/UHF range)
— for frequency spacing 25 kHz:	100.000 MHz to 149.975 MHz
— for frequency spacing of 8.33 kHz:	100.0000 MHz to 149.9916 MHz
— for frequency spacing of 25 kHz:	220.000 MHz to 399.975 MHz
— for frequency spacing of 8.33 kHz:	220.0000 MHz to 399.9916 MHz
Maximum number of radio communication channels with 100% auto redundancy	46
Radio communication equipment redundancy modes	100% auto redundancy 100% redundancy with manual selection sliding redundancy
Minimum transmitter output capacity,	50W (selectable from 5W with 1W increment)
Maximum receiver sensitivity	1 ЕV
Modulation type for transmit and receive modes	A3E (AM) MSK D8PSK GFSK
Data exchange mode	ACARS VDL-2
Power supply (with automatic switchover)
External single-phase AC power supply
— supply voltage	187-242V
— supply frequency	49-51Hz
External DC power supply	21-32V (with grounded negative)
Operating conditions
For ATRC hardware outdoor installation
— ambient temperature	-50 to +55 °C
— environmental influence (rain) with maximum intensity	3 mm/min
— maximum wind speed	55 m/s
— icing, maximum thickness	5 cm
For ATRC hardware indoor installation (stationary facilities or containers)
- ambient temperature	-40 to +50 °C
Reliability
MTBF	40.000 hours minimum
Specified service life	15 years minimum

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