Navigation and Surveillance Systems
MAS 2700. Multilateration and ADS-B System


MAS 2700 is the state-of-the-art scalable, modular solution for providing aeronautical surveillance using multilateration (MLAT) and automatic dependent surveillance - broadcast (ADS-B) technologies. MAS 2700 detects and tracks aircrafts (ACs) and other targets equipped with Mode A/C/S transponders, as well as with ADS-B 1090ES (extended squitter) transmitters. Due to modular architecture MAS 2700 could be adapted/extended to fulfill different surveillance applications, either separately or in conjunction

  • Surveillance of ACs and vehicles on the aerodrome surface (A-MLAT);
  • Surveillance of ACs in the final approach phase (PRM approach);
  • Surveillance of ACs in the terminal area and/or en-route airspace (WAM);
  • Providing information contained in the extended squitters transmitted by ACs and/or vehicles equipped with ADS-B 1090ES transmitters;
  • Extraction of on-board aircraft systems parameters using the ground-initiated Comm-B (GICB) protocol;
  • The passive surveillance feature;
  • Monitoring of the information integrity transmitted in the extended squitters of ACs and/or vehicles equipped with ADS-B 1090ES transmitters;
  • Height-monitoring unit (HMU).

MAS 2700 fully meets the requirements of EUROCAE documents ED-117A, ED-142, ED-129B. Ready to provide Composite surveillance functionality (ADS-B and WAM) in line with future ED-142A. The first product certified in the Russian Federation that provides the functions of the ADS-B system in accordance with the requirements of EUROCAE ED-129B.


Ground receiving stations:

  • High reliability (MTBF, MTTR);
  • Receiver with three independent receiving channels and sector (120⁰) antennas provide high spatial selectivity of signals and the ability to detect spoofing;
  • Unique proprietary algorithms for decoding RF signals provide high efficiency of detecting useful signals in the presence of synchronous and non-synchronous interference and high accuracy of signal timestamp.

Central processing unit:

  • Best performance in the market (up to 400 ground stations can be connected and up to 1024 targets can be processed simultaneously);
  • Hot redundancy concept;
  • MLAT/ADS-B composite surveillance functionality in line with future ED-142A;
  • ADS-B data validation using multilateration (2D/3D) and direction finding of signals;
  • Standard ASTERIX output (any other protocol is appropriate at the customer request);
  • Multiple data output (8 or more directions) with individually configurable parameters;
  • Three data output modes to ensure compatibility with any type of surveillance data processing and display systems:
    • "Data driven mode": is appropriate for surveillance processing systems capable of handling high data rates and non-periodic update;
    • "Periodic mode": is for legacy surveillance processing systems that can process data with a constant update period ("quasi-radar" mode);
    • "Periodic predicted mode" ("tracker" mode): is intended to provide a suitable input for a direct controller plot display (system without an surveillance data processing tracking system of its own).

Control and monitoring terminal:

  • real-time comprehensive monitoring of the status and parameters of system components;
  • failure identification and isolation at the standard line replaceable units (LRU) level;
  • user friendly interface;
  • remote control and monitoring of operation of the system and its components;
  • recording of all incoming and outputting information, data logging for a period of minimum 1 month, as well as extensive options of playback;
  • convenient application for display of the current air situation and system performance (MLAT / ADS-B tracks/plots with extensive options for configuring display labels), the function of superimposing aeronautical and cartographic information, changing the display scale.



  • The maximum number of simultaneously tracked targets
    • 1024 targets
  • The maximum ground stations number to be connected to central processing unit
    • 400 GS
  • The ability to increase or alter the coverage volume or the system performance through the addition or redeployment of receiveing and/or transceiving stations
    • Provided


  • Horizontal position measurement error within areas of optimal geometry conditions (RMS)
    • 1 meter
  • Vertical aircraft position measurement error between FL 290 and FL 410 inclusive (RMS)
    • to within 10 meter
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