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-38 Technical Provisions for Mode S Services and Extended Squitter C.2.3.10.18 UAT IN The “UAT IN” CC Code subfield (“ME” bit 19, Message bit 51, TYPE=31, Subtype=0, for airborne participants AND “ME” Bit 16, Message bit 48, TYPE=31, Subtype=1 for surface participants) in ADS-B Aircraft Operational Status Messages is so called because it denotes whether the aircraft is equipped with the capability to receive ADS-B Universal Access Transceiver (UAT) Messages. The “UAT IN” CC Code in Aircraft Operational Status Messages is set to ZERO (0) if the aircraft is NOT fitted with the capability to receive ADS-B UAT Messages. The “UAT IN” CC Code Subfield is set to ONE (1) if the aircraft has the capability to receive ADS-B UAT Messages. C.2.3.10.19 Navigation Accuracy Category for Velocity (NACV) This 3-bit subfield (“ME” bits 17 – 19, Message bits 49 – 51) indicates the Navigation Accuracy Category for Velocity (NACV) as defined in §C.2.3.5.4, with the encoding as specified in Table C-5. C.2.3.10.20 NIC Supplement-C The NIC Supplement-C subfield in the Aircraft Operational Status Message is a one-bit subfield (“ME” bit 20, Message bit 52) that, together with the TYPE subfield in Surface Position Messages and the NIC Supplement-A in the Operational Status Message (“ME” Bit 44, Message Bit 76), is used to encode the Navigation Integrity Category (NIC) of the transmitting ADS-B participant. If an update has not been received from an on-board data source for the determination of the NIC value within the past 2 seconds, then the NIC Supplement subfield is encoded to indicate the larger Radius of Containment (RC). Table C-28 lists the possible NIC codes and the values of the TYPE subfield of the Airborne and Surface Position Messages, and of the NIC Supplement-A, NIC Supplement-B and NIC Supplement-C subfields that are used to encode those NIC codes in messages on the 1090 MHz ADS-B data link. C.2.3.10.21 GPS Antenna Offset The “GPS Antenna Offset” subfield is an 8-bit (“ME” bits 33 – 40, Message bits 65 – 72) field in the OM Code Subfield of surface format Aircraft Operational Status Messages that defines the position of the GPS antenna in accordance with the following. a. Lateral Axis GPS Antenna Offset: Draft “ME” bits 33 – 35 (Message bits 65 – 67) are used to encode the lateral distance of the GPS Antenna from the longitudinal axis (Roll) axis of the aircraft. Encoding is established in accordance with Table C- 33. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix C C-39 Notes.— DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Table C-33. Lateral Axis GPS Antenna Offset Encoding “ME” Bit (Message Bit) 33 34 (65) (66) 35 (67) Upper Bound of the GPS Antenna Offset Along Lateral (Pitch) Axis Left or Right of Longitudinal (Roll) Axis 0 = left Encoding 1 = right Bit 1 Bit 0 Direction (meters) 0 0 NO DATA 0 0 1 1 0 LEFT 2 4 1 1 6 0 0 0 1 0 1 1 0 RIGHT 2 4 1 1 6 1. Left means toward the left wing tip moving from the longitudinal center line of the aircraft. 2. Right means toward the right wing tip moving from the longitudinal center line of the aircraft. 3. Maximum distance left or right of aircraft longitudinal (roll) axis is 6 meters or 19.685 feet. If the distance is greater than 6 meters, then the encoding should be set to 6 meters. 4. The “No Data” case is indicated by encoding of “000” as above, while the “ZERO” offset case is represented by encoding of “100” as above. 5. The accuracy requirement is assumed to be better than 2 meters, consistent with the data resolution. b. Longitudinal Axis GPS Antenna Offset: “ME” bits 36 – 40 (Message bits 68 – 72) are used to encode the longitudinal distance of the GPS Antenna from the NOSE of the aircraft. Encoding is established in accordance with Table C-34. If the Antenna Offset is compensated by the Sensor to be the position of the ADS-B participant’s ADS-B Position Reference Point (RTCA DO-242A, §3.4.4.9.7), then the encoding is set to binary “00001” in Table C-34. Table C-34. Longitudinal Axis GPS Antenna Offset Encoding Draft 36 (68) “ME” Bit (Message Bit) 37 38 39 (69) (70) (71) Encoding 40 (72) Upper Bound of the GPS Antenna Offset Along Longitudinal (Roll) Axis Aft From Aircraft Nose Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (meters) 0 0 0 0 0 NO DATA 0 0 0 0 1 Position Offset Applied by Sensor 0 0 0 1 0 2 0 0 0 1 1 4 0 0 1 0 0 6 * * * * * *** * * * * * *** * * * * * *** 1 1 1 1 1 60 Notes.— 1. Maximum distance aft from aircraft nose is 60 meters or 196.85 feet. 2. The accuracy requirement is assumed to be better than 2 meters, consistent with the data resolution. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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