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 B-14 Technical Provisions for Mode S Services and Extended Squitter Coding (Binary) (Decimal) Meaning 0 0000 0000 0 Target heading/track = Zero degrees 0 0000 0001 1 Target heading/track = 1 degree 0 0000 0010 2 Target heading/track = 2 degrees *** *** *** 1 0110 0111 359 Target heading/track = 359 degrees 1 0110 1000 through 1 1111 1111 360 through 511 Invalid B.2.3.9.10 TARGET HEADING/TRACK INDICATOR This 1-bit (ME bit 37, message bit 69) subfield shall be used to indicate whether a Heading Angle or a track angle is being reported in the target heading/track angle subfield. A value of ZERO (0) shall indicate the Target Heading Angle is being reported. A value of ONE (1) shall indicate that Track Angle is being reported. B.2.3.9.11 HORIZONTAL MODE INDICATOR This 2-bit (ME bits 38 — 39, Message bits 70 — 71) subfield shall be used to indicate whether the target heading/track is being acquired (i.e. lateral transition toward the target direction is in progress) or whether the target heading/track has been acquired and is currently being maintained. The horizontal mode Indicator subfield shall be encoded as specified in the following table. Coding (Binary) (Decimal) Meaning 00 0 Unknown mode or information unavailable 01 1 “Acquiring” mode Draft 10 2 “Capturing” or “Maintaining” mode 11 3 Reserved B.2.3.9.12 NAVIGATION ACCURACY CATEGORY FOR POSITION (NACP) This 4-bit (ME bits 40 — 43, message bits 72 — 75) subfield shall be used to indicate the navigational accuracy category of the navigation information used as the basis for the aircraft reported position. The NACP subfield shall be encoded 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
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Appendix B B-15 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 < 1852 m (1NM) — 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 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 GPS or 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 GPS or GNSS system, VEPU is commonly called VFOM (Vertical Figure of Merit). 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. Draft B.2.3.9.13 NAVIGATION INTEGRITY CATEGORY FOR BARO (NICBARO) This 1-bit (ME bit 44, message bit 76) subfield shall be used to indicate whether or not the barometric pressure-altitude being reported in the airborne position message (see §A.2.3.2) has been crosschecked against another source of pressure-altitude. The NICBARO subfield shall be encoded as specified in the following table. If an update has not been received from an on-board data source for NICBARO within the past 5 seconds, then the NICBARO subfield shall be encoded as a value of ZERO (0). 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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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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