AZIMUT held the 31st meeting of the EUROCAE working group WG-51 SG4 (Composite ADS-B/WAM System)

The 31st meeting of the EUROCAE working group WG-51 SG4 (Composite ADS-B/WAM System), engaged in the development of a new version of the ED-142A document (Technical Specifications for Wide-Area MLAT (WAM) with ADS-B/ MLAT composite functionality) was held in St. Petersburg from 5 to 7 June, 2018 at the invitation of AZIMUT JSC.

The working group includes the world's leading manufacturers of MLAT systems: ERA, Frequentis-Comsoft, Thales, Indra, SAAB Sensis, as well as air navigation service providers (ANSP): DFS, ENAV, and NATS. The Russian industry at the meeting was presented by AZIMUT JSC.

At the 31st meeting, the participants discussed draft changes (in relation to the original ED-142 document) in the requirements for the generation and transmission of the Mode S interrogation signals, control and monitoring functions, as well as the use of passive surveillance methods.

The development of Composite Surveillance is truly the State of the Art as far as civilian surveillance sensors are concerned.  The specifications developed at this early stage, detailing how to merge Wide Area Multilateration and ADS-B technologies in an appropriate manner, will be used for many years to come both within Europe and globally. For engineers, establishing a detailed specification for such components of the surveillance infrastructure is at the heart of any modern and efficient Air Traffic Management system.

The specifications produced within the EUROCAE Working Groups define metrics such as performance, interoperability, safety and security. Mistakes made when drafting the standards specification for components of an Air Traffic Management infrastructure can be extremely costly to rectify and could even threaten the safety of the travelling public. The importance of the work is thus not to be under-estimated.

Writing such specifications can be laborious and time consuming however, as EUROCAE WG51 SG4 found out in early June when Azimut hosted their meeting, working on them in a city as beautiful and vibrant as St Petersburg can also be a great privilege.

Azimut are an integral part of the EUROCAE team and Dr. Holger Neufeldt, the chairman of WG51 SG4 thanked them for their warm welcome, their professionalism and their generosity. The attendees of the meeting thanked the wonderful city of St Petersburg for providing such a magnificent backdrop for the event.

AZIMUT JSC has completed the development of the MAS 2700 MLAT system equipment and is starting acceptance and certification tests. The MAS 2700 system meets all relevant EUROCAE standards for the current time in terms of the technical specifications of the MLAT systems: ED-142, ED-117A, and automatic dependent surveillance – broadcast: ED-129B.

Taking an active part in creating a new EUROCAE standard in the framework of the working group WG-51 SG4, AZIMUT JSC engineers and designers laid the basis for the development of the MAS 2700 system, technical solutions for the development of an advanced MLAT/ADS-B composite surveillance system. At present, the MAS 2700 system has two functionally independent surveillance channels: MLAT and ADS-B, which is the first step towards the development of a composite MLAT/ADS-B surveillance system. The functions of the system are as follows: MLAT and ADS-B track association; MLAT and ADS-B coordinate comparison, the assessment of the status and quality of the data; the assessment of the uncompensated latency of the ADS-B coordinate data; and reduction in the number of interrogations due to the use of the passive surveillance methods; all of these system functions are currently operating in a test mode.

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