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-40 Technical Provisions for Mode S Services and Extended Squitter C.2.4 INITIALIZATION AND TIMEOUT Note.— Initialization and timeout functions for Extended Squitter broadcast are performed by the transponder and are specified in RTCA/DO-181D (EUROCAE ED-73C). A description of these functions is presented in the following paragraphs to serve as reference material for the section on the GFM (§C.2.5). C.2.4.1 INITIATION OF EXTENDED SQUITTER BROADCAST At power up initialization, the transponder shall commence operation in a mode in which it broadcasts only acquisition squitters. The transponder shall initiate the broadcast of Extended Squitters for Airborne Position, Surface Position, Aircraft Identification and Category, Airborne Velocity, Target State and Status and Operational Status when data are inserted into Registers 0516, 0616, 0816, 0916, 6216 and 6516 respectively. This determination shall be made individually for each squitter type. The insertion of just altitude or surveillance status data into Register 0516 by the transponder shall not satisfy the minimum requirement for broadcast of the airborne position squitter. Note.— This suppresses the transmission of Extended Squitters from aircraft that are unable to report position, velocity or identity information. C.2.4.2 EXTENDED SQUITTER BROADCAST RATES The maximum 1090 MHz ADS-B message transmission rate shall not exceed 6.2 transmitted messages per second, averaged over any 60 second interval (see §3.1.2.8.9.1, Annex 10, Vol. IV). Note.— Transponders are limited to no more than 2 Event Driven messages per second. Therefore, the average of 2 Airborne Position, 2 Airborne Velocity, 0.2 Identification, and 2 Periodic Status and Event Driven messages per second, averaged over any 60 second interval, yields the required 6.2 messages per second. The summary of all extended squitter broadcast rates is presented in Table C-35. Table C-35. 1090 MHz Extended Squitter ADS-B Message Broadcast Rates Transponder Register Event Driven Message Priority 1090ES ADS-B Message On-the-Ground, not moving Broadcast Rate On-the-Ground and moving Airborne BDS 0,5 N/A Airborne Position N/A N/A 2 / 1 second (0.4 – 0.6 sec) LOW RATE HIGH RATE BDS 0,6 N/A Surface Position 1 / 5 seconds 2 / 1 second N/A (4.8 – 5.2 sec) (0.4 – 0.6 sec) LOW RATE HIGH RATE HIGH RATE BDS 0,8 N/A Aircraft Identification and Category 1 / 10 seconds 1 / 5 seconds 1 / 5 seconds (9.8 – 10.2 sec) (4.8 – 5.2 sec) (4.8 – 5.2 sec) BDS 0,9 N/A Airborne Velocity N/A N/A TCAS RA or Mode A Code Change 2 / 1 second (0.4 – 0.6 sec) BDS 6,1 TCAS RA = 1 Emergency = 2 Aircraft Status (Emergency/Priority Status, Subtype=1) (TCAS RA Broadcast, Subtype=2) 0.7 – 0.9 seconds No TCAS RA, No Mode A Change 4.8 – 5.2 seconds No TCAS RA, No Mode A Change, No Emergency, Mode A Code set to 10008 No Transmission BDS 6,2 N/A Target State and Status (TSS) N/A N/A 1.2 – 1.3 seconds No change NICSUPP/NAC/SIL 2.4 – 2.6 seconds TSS being broadcast or not No change TCAS/NAC/SIL/NICSUPP 2.4 – 2.6 seconds TSS being broadcast BDS 6,5 N/A Aircraft Operational Status 4.8 – 5.2 seconds Change in NICSUPP/NAC/SIL 0.7 – 0.9 seconds Change in TCAS/NAC/SIL/NICSUPP 2.4 – 2.6 seconds TSS not broadcast 2 Change in TCAS/NAC/SIL/NICSUPP 0.7 – 0.9 seconds N/A = Not Applicable Draft DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix C C-41 Notes.— DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris C.2.4.3 REGISTER TIMEOUT 1. These Registers are cleared to prevent the reporting of outdated position and velocity information. 2. During a register timeout event, the “ME” field of the ADS-B Broadcast Message may contain ALL ZEROs, except for those fields that may be updated due to the receipt of new data. a. The ADS-B Transmitting Subsystem shall clear all but the altitude and surveillance status subfields of the Airborne Position Message, if no new position data is received within two (2) seconds of the previous input data update. Note.— During a timeout event the Format TYPE Code is set to ZERO (see §C.2.3.1.1.4). b. The ADS-B Transmitting Subsystem shall clear all 56-bits of the Surface Position Message if no new position data is received within two (2) seconds of the previous input data update. Notes.— 1. During a timeout event the Format TYPE Code is set to ZERO (see §C.2.3.1.1.4). 2. When position is available, the ADS-B Transmitting Subsystem manages the movement and the heading/ground track subfields such that the subfields and applicable status bits are set to ZERO (0) if no new data is received for the subfield within 2.6 seconds of the last data update of the subfield. 3. When position data is not received, all bits of the Surface Position Message are set to ZERO to avoid confusion with altitude data in the Airborne Position Message sent with TYPE Code ZERO (0). c. The ADS-B Transmitting Subsystem shall clear all 56-bits of the Airborne Velocity Message if no data is received within 2.6 seconds of the previous input data update. Note.— The Intent Change information is not sufficient to consider that new data has been received (see §C.2.3.5.3). Draft d. The ADS-B Transmitting Subsystem shall not clear the Aircraft Identification Message (see §C.2.3.4). Note.— The Aircraft Identification Message, is not cleared since it contains data that rarely changes in flight and is not frequently updated. e. The ADS-B Transmitting Subsystem shall clear each of the Selected Altitude, Selected Heading, or Barometric Pressure Setting subfields of the Target State and Status Message (see §C.2.3.9) if no new data is received within 2.0 seconds of the previous input data update for the respective subfield. Each of the subfields shall be cleared independently of the other subfields. That is, each of the three specified subfields shall be processed mutually exclusively of the other two specified subfields. The remaining subfields of the Target State and Status Message shall not be cleared, as they contain other integrity, mode, or status information. f. The ADS-B Transmitting Subsystem shall not clear the Operational Status Messages (see §C.2.3.10) since the subfields of the Message contain various integrity, mode, or status information.. g. The ADS-B Transmitting Subsystem shall not clear the Event-Driven Messages (see §C.2.3.7). Note.— The Event-Driven Messages do not need to be cleared since contents of such messages are only broadcast once each time that new data is received. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Appendix B B-19 a) ACAS operational
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Technical Provisions for Mode S Services and Extended Squitter

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