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 4-2 Technical Provisions for Mode S Services and Extended Squitter Table 4-1. ADS-B Version 2 Backward Compatibility Summary Description of ADS-B Version 2 Change Backward Compatibility Impact to Version 1 Receiver 1 Add duplicate address processing for ADS-B and ADS-R. None – Modifies Version 2 receiver requirements so no impact to Version 1 receivers. ADS-B None - Uses an additional bit in transmitted message to 2 Add NIC value for RC of 0.3 NM between currently defined NIC values for RC of 0.2 and 0.5 NM. encode. Version 1 receivers will decode as RC of 0.6 NM. ADS-R None – Version 2 Additional bit allocated in Operational Status Message for ADS-R NIC Supplement B. 3 Add ability to transmit UTC Coupled (T=1) for the non-precision NIC values. Add broadcast of Mode A code at higher rates than None. 4 Version 1. Different update rates are required between the steady state condition (no Mode A code change) and when the code is changed. Delete requirement for “Receiving ATC Service” bit, Transparent to Version 1 receivers except they will receive more messages due to higher transmit rate. 5 but note it as reserved for that purpose in the future if Mode A code is ever supplanted. None—not used air-to-air. 6 NACV definition clarification. None. 7 Remove vertical components from NACP, NACV, NIC and SIL. None. 8 Add parameter for Geometric Vertical Accuracy. None - Uses reserved bits that will not be decodable. 9 Redefine SIL and add SIL Supplement and System Design Assurance. None - New Source Integrity Level parameter replaces Surveillance Integrity Level. SIL Supplement and SDA uses reserved bits that will not be decodable. 10 Delete CDTI bit and create 2 bit field to denote UAT IN and 1090ES IN (for Ground use). The CDTI bit will be decoded incorrectly—but is not used by current avionics. Since a different code is used for the updated message, Version 1 receivers will not decode the message at all. There are no current applications that use the target state Revise Target State and Status Message to add data. However, since there are some integrity and 11 selected altitude, modify mode bits and include the accuracy parameters transmitted in the Target State and pilot selected pressure altitude correction. Add note to explain that NIC is to be immediately set Status Message, Version 1 receivers will not be receiving these parameters at the proper update rate. However, not all aircraft transmit the Target State and Status Message. 12 to ZERO on receipt of an alarm discrete from GPS sensor. T=0 position extrapolation accuracy changed from None. 13 within 200 ms of the time of transmission to within 100 ms. None. Version 1 contained a Single Antenna Flag but since it 14 Support a Single Antenna Flag. has moved, receivers will not properly decode it. Current applications do not use the Single Antenna Flag. Slight change in values at lower Ground speeds, but 15 Ground Speed encoding change. since the Ground speed is highly inaccurate in the range of the change, not a significant impact. 16 Include Loss of GPS Position as a criteria for a fail/warn annunciation. None. Draft 4-2 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 Chapter 2. Overview of Mode S Services and Extended Squitter Version 2 2-3 Description of ADS-B Version 2 Change Backward Compatibility Impact to Version 1 Receiver 17 Redefine Length/Width Codes to add a code for “No Information Available.” Minor impact since smallest represented length/width would be interpreted as unknown. 18 Change definition of TCAS Operational and TCAS RA active bits. These bits will be decoded incorrectly—but are not used by current avionics. 19 Add additional NIC values when reporting surface position data so that larger RC values can be represented when on the surface. None – Receivers will decode additional NICs as unknown integrity. 20 Add TCAS RA broadcast. None - Uses reserved code that will not be decodable. 21 Add new equipment class to allow single antenna with A1 power level. None. 22 Modify Local CPR Reasonableness Test to account for air-to-ground and ground-to-air transitions. None. 4.2 DETAILED TECHNICAL PROVISIONS Detailed technical provisions for data formats and control parameters for 1090ES Version 2 and TIS-B/ADS-R are specified in Appendix C. 4.3 IMPLEMENTATION GUIDELINES Implementation guidelines for Mode S services and 1090ES Version 2 formats and protocols are provided in Appendix D. 4.4 SERVICES UNDER DEVELOPMENT Technical information on potential future Mode S and extended squitter services is presented in Appendix E. Draft _____________________ 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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Appendix CD CD-3 ACTIONS EVENTS DRA
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