ICAO CIRCULAR 256-AN11 52 CIRCULAR AUTOMATIC DEPENDENT SURVEILLANCE ADS AND AIR TRAFFIC SERVICES ATS DATA LINK APPLICATIONS Approved by the Secretary General and published under his authority INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA
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FOREWORD The ICAO Tenth Air Navigation Conference 1991 endorsed the communications, navigation and surveillancelair traffic management CNSIATM systems and recognized that global implementation would be essential to derive the full benefits of those systems. Among the different technologies being developed, automatic dependent surveillance ADS was recognized as playing an important role in air traffic management enhancements which will improve airspace capacity. In November 1994, the Air Navigation Commission considered the operational requirements and guidance material for ADS and air traffic services ATS data link applications developed by the third meeting of the Automatic Dependent Surveillance Panel ADSPl3. The Commission agreed that the guidance material should be made available for use in the design of equipment, facilities and services for ADS and data links as envisioned by ICAO as part of the global CNSIATM systems. Furthermore, the Commission recognized that the guidance material contains valuable information of interest to the international aviation community and agreed to the publication of the material as an ICAO circular. The circular contains guidance material comprising long-term requirements and system performance requirements for ADS and ATS data link applications. Part I provides operational requirements, functional descriptions and performance characteristics for implementation of the ADS technique in an ADS-based air traffic control ATC system. Part I1 contains technical information on direct controller- pilot communications and air traffic services interfacility communications via data link. .Part I1 is not yet complete with regard to the description and operational requirements for data link applications. This part will be finalized for inclusion in a future ICAO manual on ADS and ATS data link applications. At that time, the units of measurement shown in the circular will be aligned as necessary with the international Standards and Recommended Practices for dimensional units to be used in air and ground operations, contained in Annex 5 to the Convention on International Civil Aviation Doc 7300. The defined operational requirements are considered adequate for ADS and data link applications. However, in order to reach the objective of using ADS for tactical control, additional operational and functional requirements are expected to be identified. For example, the performance characteristics, documented for each operational requirement and each system element will develop in light of experience with implementation and operation in an ADS environment. Also, the end-to-end communications network and data processing time need refinement in order to achieve the required responsiveness for real-time ATC surveillance systems. The operational requirements as contained in the guidance material should be implemented selectively and in accordance with regional planning to meet traffic demand and regional requirements. The importance of human factors issues in relation to ATC, communications and data display need to be treated as an integral part of the development of the ADS-based ATC system. It is expected that the contents of this ICAO circular will be used as guidance for the harmonized development of a global ADS system, and thus will contribute to the enhancement of safety, regularity and efficiency of international civil aviation.
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