Technical Provisions for Mode S Services and Extended Squitter

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DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris C-96 Technical Provisions for Mode S Services and Extended Squitter assurance. In ADS-B Version Two (2), this aspect of integrity is represented by the System Design Assurance (SDA) parameter. The ADS-B Report Assembly Function will shall extract the Surveillance Integrity Level data from Aircraft Operational Status Messages and the Target State and Status Messages and provide the Source Integrity Level to the user application in the Mode Status Report in the binary format. Note.— Applications using Reports from ADS-B Version One (1) participants may be able to use the Surveillance Integrity Level to derive both Source Integrity Level and System Design Assurance (SDA). C.5.3.2.9 Track/Heading and Horizontal Reference Direction (HRD) The ADS-B Report Assembly Function will shall extract the Track Angle/Heading (see §C.2.3.10.12) and the Horizontal Reference Direction (HRD) (see §C.2.3.10.13) flag bits from the Aircraft Operational Status Message (see §C.2.3.10) and set the True/Magnetic Heading field in the ADS-B Report. This item within the ADS-B Report is used to indicate the nature of the Horizontal Direction information being reported in the ADS-B Reports and Target State Reports. This applies to the aircraft reported Horizontal Direction (in the ADS-B Report). C.5.3.2.10 Air Referenced Velocity Reports The requirements for Air Referenced Velocity (ARV) Reports shall apply to the ARV Report Assembly requirements when the target aircraft is broadcasting either ADS-B Version One (1) or Version Two (2) Message formats (Table A-2-9b). C.5.3.2.11 Target State Reports Note.— Since the content and use of Target State Reports changed between ADS-B Version One (1) and Version Two (2), there is no requirement for an ADS-B Version Two (2) receiving subsystem to output ADS-B Version One (1) Target State Reports. Draft DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Appendix CD IMPLEMENTATION GUIDELINES CD.1 INTRODUCTION CD.1.1 GENERAL CD.1.1.1 This appendix provides implementation guidelines on data formats for applications using Mode S specific services and extended squitter contained in Appendices A, B and B C of this document. CD.1.1.2 The appendix contains implementation guidelines for the following: a) Transponder Comm-B registers and extended squitter; b) Mode S specific protocols; c) Mode S broadcast protocols; and d) Extended squitter ground stations. CD.1.1.3 The appendix is intended for use by the avionics industry and by the developers of air traffic services (ATS) applications. CD.1.2 MODE S SPECIFIC SERVICES OVERVIEW CD.1.2.1 Mode S specific services are data link services that can be accessed by a separate dedicated interface to the Mode S subnetwork. On the ground they can also be accessed via the aeronautical telecommunication network (ATN). They operate with a minimum of overhead and delay and use the link efficiently, which makes them highly suited to ATS applications. CD.1.2.2 There are three categories of service provided: Draft a) Ground-initiated Comm-B (GICB) protocol. This service consists of defined data available on board the aircraft being put into one of the 255 transponder registers (each with a length of 56 bits) in the Mode S transponder at specified intervals by a serving process, e.g. airborne collision avoidance system (ACAS) or the aircraft data link processor (ADLP). A Mode S ground interrogator or an ACAS unit can extract the information from any of these transponder registers at any time and pass it for onward transmission to ground-based or aircraft applications. b) Mode S specific protocols (MSPs). This service uses one or more of the 63 uplink or downlink channels provided by this protocol to transfer data in either short- or long-form MSP packets from the ground data link processor (GDLP) to the ADLP or vice versa. c) Mode S broadcast protocol. This service permits a limited amount of data to be broadcast from the ground to all aircraft. In the downlink direction, the presence of a broadcast message is indicated by the transponder, and this message can be extracted by all Mode S systems that have the aircraft in coverage at the time. An identifier is included as the first byte of all broadcasts to permit the data content and format to be determined. CD-1 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Msg Bit # “ME” Bit # Appendix C
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