AERONAUTICALMOBILECOMMUNICATIONSPANEL摘要.docVIP

AERONAUTICAL MOBILE COMMUNICATIONS PANEL Working Group M Third Meeting 10-18 December 2001 Tianjin, China Agenda Item 8: Review of results of the subgroup of Nicolas Fistas ICAO STANDARDISED SYSTEMS SUPPORTING ADS-B Presented by Larry Johnsson SUMMARY The TLAT report concludes as of March 2001 that no single data link (1090 Extended Squitter, VDL Mode 4 and UAT) meets all of the requirements for all the ADS-B airborne applications assessed. However, the TLAT did not consider beneficial features of all links, and since March 2001 each link has been assessed with improved performance. Today, it may be stated that each link has unique strengths as well as unique constraints and limitations. Each link can satisfy a broad set of near-term and mid-term ADS-B applications. Further analysis may show that each link has the ability to satisfy all, or virtually all, of the ADS-B applications assessed. It may also be stated that the combined use of VDL Mode 4 and Mode S Extended Squitter addresses a number of the shortcomings of the individual links in the TLAT report. When considered along with several operating techniques beyond those addressed in the TLAT exercise, VDL Mode 4 combined with Mode S Extended Squitter offers a solution that is optimised for short, medium and long range applications. This approach also offers the flexibility to implement regional solutions in the short term based upon either technology whilst providing the ability to meet the requirements for high density airspace using existing ICAO standardised systems. The combined solution also offers benefits through increased redundancy, integrity and availability of ADS-B applications as well as for ACAS. Therefore, ICAO should consider this combined system as an evolutionary means to extend the capabilities of its existing standardised systems. 1. Introduction Work has been completed by AMCP on the evaluation of data links for surveillance applications, i.e. VDL Mode 4 and Mode S Extended Squitt