Multilateration and ADS-B Ground Surveillance System



Multilateration and ADS-B Ground Surveillance System is a scalable versatile cooperative surveillance solution intended for various applications.

Depending on the configuration, the system can be used as:

  • Source of ADS-B/WAM/MLAT surveillance data for Air Traffic Management needs (for ACC/APP/TWR Air Traffic Services units)
  • Source of ADS-B/MLAT data for Advanced Surface Movement Guidance and Control Systems (A-SMGCS)
  • Complete Airport Ground Movement Display solution
  • Airport Vehicle Tracking System
  • Complete Air Situation Display solution for Mobile Towers or low/medium traffic ATS units
  • Source of surveillance data for third-party user software via API and DataStream.

Key features

  • Combined ADS-B and Multilateration surveillance functions
  • Very high data update rate compared to traditional radars
  • MLAT-ready ground stations, that can be integrated to WAM/MLAT system at any stage
  • Situational awareness by the presentation of electronic surveillance of high accuracy and integrity in accordance with EuroCAE specifications
  • Flexibility and scalability to tailor performances and functions to meet any customer needs
  • Field-proven coverage simulation software to ensure proper ground stations layout
  • Field-proven coverage modelling software for proper ground stations placement
  • Wide use of COTS components
  • Independent synchronization based on reference transmitter or GNSS
  • Build-in 1-month recording and playback capabilities on all levels of the system
  • Robust system design to ensure high system availability
  • Industrial-grade components to withstand extreme climatic conditions
  • Maintenance-free system
  • Low life cycle costs
  • Support for standard ASTERIX data formats and Customer-specific formats.

System components

Multilateration and ADS-B Ground Surveillance System as a modular and expandable open system can be tailored to Customer needs (environmental conditions, required coverage, redundancy level, traffic capacity, functional features, etc.).

The following five basic constituents build a complete surveillance solution:

  • 1090MHz ground station(s)
  • Traffic Situation Display(s) (TSD)
  • Control and Monitoring subsystem (CMS)
  • Central Processing Station (CPS)
  • Vehicle Tracking System (1090ES transponders)

The number of ground stations and Traffic Situation Displays, Central Processing Station capacity, related auxiliary subsystems and components may vary depending on the required configuration. 

System operation

ADS-B Ground System offers surveillance services based on the 1090 Extended Squitter reception technique. Aircraft (or ground vehicles) equipped with appropriate transponder periodically broadcast information about their movement. The ADS-B ground station receives these ADS-B broadcasts (Extended Squitters), which contain information about the aircraft’s current position, altitude, velocity, callsign, etc.

The Multilateration principle requires a distributed network of ADS-B ground stations in order to enable the simultaneous recep­tion of the same transponder signals at different locations. Emitted transponder signals are received by multiple ground stations placed at remote sites in well–known positions around the coverage area. A Central Processing Station collects and processes the data provided by the ground stations and calculates target positions using differential Multilateration methods based on Time Difference of Arrival.

The Central Processing Station transmits the decoded data as ASTERIX messages over the network to ATC surveillance applications and/or Traffic Situation Displays.

TSD can be used as an integral part of technical Control and Monitoring function or can be scaled to a dedicated Air Situation or Ground Movement Display System intended to provide situational awareness for various stakeholders.

TSD provides users with a full dynamic view of the traffic situation, showing area maps and target labels with the identification, position and other information regarding aircraft and ground vehicles as target symbols. It provides textual and graphical information available for presentation in various windows according to the functional tasks to be carried out by the users.

The system is developed in accordance with a spectrum of requirements of the International and European Standards, Regulations, Specifications and Guidelines and meets one of the key A-SMGCS requirements – improvement of the surveillance function, namely, ensuring the identification and provision of accurate positional information about all types of traffic on the movement area (airfield), including the runway.

Together with Ansart’s 1090ES vehicle transponder, it forms a comprehensive cost-effective solution for ground movement monitoring, identifying potential conflict situations (Safety Nets) and reduction the risk of runway incursion.


  • Regulation (EU) 2018/1139, (EU) No 1028/2014, (EU) No 1207/2011
  • ICAO: Annex 10, Annex 11, Doc 4444, Circular 311, Doc 9871.
  • EU directive: 2014/30/EU, 2014/35/EU, 2014/53/EU, 2012/19/EU, 2011/65/EU
  • EUROCAE: ED-102B, ED-109, ED-117, ED-126, ED-129B, ED-142, ED-153, ED-159, ED-160, ED-161, ED-163,
  • RTCA: DO-260C, DO-303, DO-312, DO-314, DO-318, DO-321,
  • EUROCONTROL ET1.ST05.2000-STD-12-01, SUR.ET1.ST05.2000-STD-16-01.

Technical Specification 


a)    detection range

b)    detection height

c)    azimuth


Up to 250 nm / 460 km (line of sight)

at least 0… 20,000 m

0 to 360°

Type of detected traffic:

a)    WAM/MLAT

b)    ADS-B


Mode A/C/S, 1090 ES

1090 ES

Time synchronization GPS / GLONASS and independent based on reference transmitter
Absolute error of the target report reception time not more than 25 msec
In case of loss of synchronization, the time accuracy is maintained for at least 30 minutes;
Data update rate (depending on the type and position of aircraft and ground vehicles) 1…10 sec
Data output modes Periodic

Data Driven

Data output formats over UDP/IP/Ethernet


ASTERIX cat. 021

ASTERIX cat. 023

ASTERIX cat. 247

Data output formats for MLAT/WAM applications (option) ASTERIX cat. 019

ASTERIX cat. 020

Any ICD upon request

Number of configurable redundant data output streams (subscriber groups) 8 per ground station

64 per Central Processing Station

Data recording (archiving) and playback for at least 1 month
Ground Stations power supply 85 – 300 VAC

Option: 12…48 VDC

Ground Stations battery runtime 60 … 240 minutes, depending on the battery
Computing platform Industrial Single-Board Computer (x86-64)
Operating System Oracle Linux
Operating conditions (for outdoor ground stations)

a)    ambient air temperature

b)    air humidity

c)    precipitation


from -40°С to +60°С

up to 98% at 25°С

rain, snow, dew, rime ice

Outdoor enclosure Ingress Protection rating up to IP66
Redundancy options for ground stations


Non-redundant (single)

Redundant (dual)

Reliability, Availability, Maintainability

a)    Service life

b)    Mean Time Between Failures (MTBF)

c)    Availability

d)    Mean Time To Recovery (MTTR)


15 years

at least 40 000 hours


not more than 15 min