Technical Provisions for Mode S Services and Extended Squitter

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B-22 Technical Provisions for Mode S Services and Extended Squitter B.2.3.10.6.2 If an update has not been received from an on-board data source for the NIC value within the past 5 seconds, then the TYPE Code and NIC Supplement shall be encoded to indicate that RC is “Unknown.” NIC value Containment Radius (RC) and Vertical Protection Limit (VPL) Airborne position TYPE Code Airborne Surface NIC supplement Code Surface position TYPE Code NIC supplement Code 0 RC unknown 0, 18 or 22 0 0, 8 0 1 RC < 20 NM (37.04 km) 17 0 N/A N/A 2 RC < 8 NM (14.816 km) 16 0 N/A N/A 3 RC < 4 NM (7.408 km) 16 1 N/A N/A 4 RC < 2 NM (3.704 km) 15 0 N/A N/A 5 RC < 1 NM (1 852 m) 14 0 N/A N/A 6 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris RC < 0.6 NM (1 111.2 m) 13 1 RC < 0.5 NM (926 m) 13 0 N/A N/A 7 RC < 0.2 NM (370.4 m) 12 0 N/A N/A 8 RC < 0.1 NM (185.2 m) 11 0 7 0 9 RC < 75 m and VPL < 112 m 11 1 7 1 10 RC < 25 m and VPL < 37.5 m 10 or 21 0 6 0 11 RC < 7.5 m and VPL < 11 m 9 or 20 0 5 0 Note 1.— “N/A” means “This NIC value is not available in the ADS-B surface position message formats.” Note 2.— The NIC parameter is broadcast partly in the TYPE subfield of airborne position and surface position messages, and partly in the NIC Supplement subfield of the aircraft operational status message. The NIC integrity containment region is described horizontally and vertically using the two parameters, RC and VPL. B.2.3.10.7 NAVIGATION ACCURACY CATEGORY FOR POSITION (NACP) Draft This 4-bit (ME bits 45–48, message bits 77–80) subfield shall be used to announce 95 per cent accuracy limits for the horizontal position (and for some NACP values, the vertical position) that is being currently broadcast in Airborne Position and Surface Position Messages. Encoding of the subfield shall be as specified in the following table. If an update has not been received from an on-board data source for NACP within the past 5 seconds, then the NACP subfield shall be encoded as a value indicating unknown accuracy. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix B B-23 Coding (Binary) (Decimal) Meaning = 95% horizontal and vertical accuracy bounds (EPU and VEPU) 0000 0 EPU ≥ 18.52 km (10 NM) — Unknown accuracy 0001 1 EPU < 18.52 km (10 NM) — RNP-10 accuracy 0010 2 EPU < 7.408 km (4 NM) — RNP-4 accuracy 0011 3 EPU < 3.704 km (2 NM) — RNP-2 accuracy 0100 4 EPU < 1 852 m (1 NM) — RNP-1 accuracy 0101 5 EPU < 926 m (0.5 NM) — RNP-0.5 accuracy 0110 6 EPU < 555.6 m ( 0.3 NM) — RNP-0.3 accuracy 0111 7 EPU < 185.2 m (0.1 NM) — RNP-0.1 accuracy 1000 8 EPU < 92.6 m (0.05 NM) — e.g. GPS (with SA) 1001 9 EPU < 30 m and VEPU < 45 m — e.g. GPS (SA off) 1010 10 EPU < 10 m and VEPU < 15 m — e.g. WAAS 1011 11 EPU < 3 m and VEPU < 4 m — e.g. LAAS 1100 – 1111 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris 12 – 15 Reserved Note 1.— The Estimated Position Uncertainty (EPU) used in the table is a 95 per cent accuracy bound on horizontal position. EPU is defined as the radius of a circle, centered on the reported position, such that the probability of the actual position lying outside the circle is 0.05. When reported by a GNSS system, EPU is commonly called HFOM (Horizontal Figure of Merit). Note 2.— Vertical Estimated Position Uncertainty (VEPU) is a 95 per cent accuracy limit on the vertical position (geometric altitude). VEPU is defined as a vertical position limit, such that the probability of the actual geometric altitude differing from the reported geometric altitude by more than that limit is 0.05. When reported by a GNSS system, VEPU is commonly called VFOM (Vertical Figure of Merit). Draft Note 3.— RNP accuracy includes error sources other than sensor error, whereas horizontal error for NACP only refers to horizontal position error uncertainty. Note 4.— If geometric altitude is not being reported, then the VEPU tests are not assessed. B.2.3.10.8 BAROMETRIC ALTITUDE QUALITY (BAQ) This 2-bit (ME bits 49–50, message bits 81–82) subfield in the airborne operational status message (subtype=0) shall be set to zero (0) by ADS-B transmitting subsystems. B.2.3.10.9 SURVEILLANCE INTEGRITY LEVEL (SIL) This 2-bit (ME bits 51–52, Message bits 83–84) subfield shall be used to define the probability of the integrity containment region described by the NIC parameter being exceeded for the selected position source, including any external signals used by the source. Encoding of the subfield shall be as shown in the following table. For installations 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-23 CD.2.4.7.5 BINARY
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Technical Provisions for Mode S Services and Extended Squitter

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