Technical Provisions for Mode S Services and Extended Squitter

More documents

Recommendations

Info

DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris B-24 Technical Provisions for Mode S Services and Extended Squitter where the SIL value is being dynamically updated, if an update has not been received from an on-board data source for SIL within the past 5 seconds, then the SIL subfield shall be encoded as a value indicating “Unknown.” The probability specified by the SIL subfield shall be the largest likelihood of any one of the following occurring when a valid geometric position is provided by the selected position source: a) a position source equipment malfunction (per hour); b) the per sample probability of a position source error larger than the horizontal or vertical integrity containment region associated with the NIC value(s); or c) for GNSS, the probability of the signal-in-space causing a position error larger than the horizontal or vertical containment region associated with the NIC value(s) without an indication (see note 1 below the table), within a time period determined by the positioning source, as indicated in the table. Coding (Binary) (Decimal) Probability of exceeding the Horizontal Containment Radius (RC) reported in the NIC Subfield without an indication Probability of exceeding the Vertical Integrity Containment Region (VPL) without an indication 00 0 Unknown Unknown 01 1 ≤1 × 10 - 3 per flight hour or per sample ≤1 × 10 - 3 per flight hour or per sample 10 2 ≤1 × 10 - 5 per flight hour or per sample ≤1 × 10 - 5 per flight hour or per sample 11 3 ≤1 × 10 - 7 per flight hour or per sample ≤2 × 10 - 7 per 150 seconds or per sample Note 1.— “An Indication” may include, for example, a flag for invalid position report, or a change in NIC, or switching to another data source. Note 2.— A problem for installations that include currently available GNSS receivers and FMS systems is that SIL is not output by these systems. Most implementers are expected to determine SIL by off-line analysis of the installed configuration. This off-line analysis can be performed on the various primary and alternate means of determining the reported position. SIL is a static value for each of these configurations. Draft Note 3.— The vertical integrity containment column applies to NIC values greater than 8. Note 4.— The SIL code value is the lower of the horizontal or vertical coding values. Note 5.— It is recognized that there are three possible derivations of SIL: (a) the integrity value provided by navigation sensors with self-monitoring capability (e.g. GPS), (b) the reliability of aircraft systems given as indicated by a failure rate commensurate with the equipment design assurance, and (c) the integrity of other navigation systems, (e.g. RNP) that rely on ground-based self-monitoring equipment for integrity assurance, and for which no specific hourly integrity value can be ascribed. These three values are not readily interchangeable. Selection of the largest of the values as specified in the table above is felt to provide a reasonable bound on the order of magnitude of the probability of possible failures affecting ADS-B applications. Note 6.— GNSS systems report integrity in terms of flight hours and FMS systems report in terms of per measurement sample (derived from a number of position measurements). While these are not equivalent measures of integrity, the difference is not considered to be critical for initial applications. 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-25 B.2.3.10.9.1 Recommendations.— 1. SIL is intended to reflect the integrity of the navigation source of the position information broadcast, therefore the SIL value transmitted should be indicative of the true integrity of the ADS-B position data. 2. If SIL information is not provided by the navigation source, implementers should not arbitrarily set an SIL value of zero indicating unknown integrity. 3. Unless there is a tightly coupled navigation source where SIL can be unambiguously determined and set dynamically, the ADS-B Transmitting Subsystem should provision for the static setting of SIL as part of the installation procedure. B.2.3.10.10 BAROMETRIC ALTITUDE INTEGRITY CODE (NICBARO) This 1-bit (ME bit 53, message bit 85) subfield shall be used to indicate whether or not the barometric pressure-altitude being reported in the airborne position message has been crosschecked against another source of pressure-altitude. The NICBARO subfield shall be encoded as shown in the following table. If an update has not been received from an onboard data source for NICBARO within the past 5 seconds, then the NICBARO subfield shall be encoded as a value of ZERO (0). Coding Meaning 0 1 The barometric altitude that is being reported in the Airborne Position Message is based on a Gilham coded input that has not been cross-checked against another source of pressure-altitude The barometric altitude that is being reported in the Airborne Position Message is either based on a Gilham code input that has been cross-checked against another source of pressure-altitude and verified as being consistent, or is based on a non-Gilham coded source Draft Note 1.— The barometric altitude value itself is conveyed within the ADS-B Position Message. B.2.3.10.10.1 The NICBARO subfield provides a method of indicating a level of data integrity for aircraft installed with Gilham encoding barometric altitude sources. Because of the potential of an undetected error when using a Gilham encoded altitude source, a comparison shall be performed with a second source and only if the two sources agree shall the NICBARO subfield be set to a value of “1”. For other barometric altitude sources (Synchro or DADS) the integrity of the data is indicated with a validity flag or SSM. No additional checks or comparisons are necessary. For these sources the NICBARO subfield shall be set to a value of “1” whenever the barometric altitude is valid. B.2.3.10.11 AIRCRAFT LENGTH AND WIDTH CODES This 4-bit (ME bits 21–24, message bits 53–56) subfield shall be used in the surface aircraft operational status message (subtype=1) to describe the amount of space that an Aircraft or Ground Vehicle occupies. The A/V length and width code shall be based on the actual dimensions of the transmitting Aircraft or Surface Vehicle as specified in the following table. Each aircraft or vehicle shall be assigned the smallest A/V length and width code consistent with its actual dimensions. Each A/V shall be assigned the smallest A/V length and width codes from the following table for which the actual length and width is less than or equal to specified upper bounds. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Page 1 and 2:
DRAFT - Working Paper ASP TSGWP11-0
Page 3 and 4:
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Appendix A A-7 TYPE Code Format Hor
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Appendix A A-13 The supersonic vers
Page 39 and 40:
Appendix A A-15 The transponder sha
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Appendix A A-41 MB FIELD DRAFT - Wo
Page 67 and 68:
Appendix A A-43 MB FIELD 1 MSB TRAN
Page 69 and 70:
Page 71 and 72:
Appendix A A-47 MB FIELD 1 2 3 4 5
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Appendix A A-55 MB FIELD 1 BDS A,8
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110: Appendix A A-85 MB FIELD DRAFT - Wo
Page 115 and 116: DRAFT - Working Paper ASP TSGWP11-0
Page 121 and 122: Appendix A A-97 a) the PI sends a T
Page 123 and 124: Appendix A A-99 This subfield shall
Page 125 and 126: Appendix A A-101 These channels hav
Page 133 and 134: Appendix A A-109 A.4. MODE S BROADC
Page 135 and 136: Appendix A A-111 Note 1.— This st
Page 139 and 140: Appendix B B-3 TYPE code Subtype co
Page 153 and 154: Appendix B B-17 Coding (Binary) (De
Page 155 and 156: Appendix B B-19 a) ACAS operational
Page 157 and 158: Appendix B B-21 Subfield Coding: DR
Page 159: Appendix B B-23 Coding (Binary) (De
Page 169 and 170: Appendix B B-33 MB FIELD DRAFT - Wo
Page 177 and 178: Appendix B B-41 CF value ICAO/Mode
Page 193 and 194: Appendix C C-5 Table C-2. “TYPE
Page 199 and 200: Appendix C C-11 C.2.3.2.2 Time Sync
Page 211 and 212:
Page 213 and 214:
Appendix C C-25 Notes.— DRAFT - W
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Msg Bit # “ME” Bit # Appendix C
Page 221 and 222:
Appendix C C-33 Msg Bit # "ME” Bi
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Appendix C C-43 Notes. — DRAFT -
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Appendix C C-51 3. The decoded posi
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Appendix C C-57 B Reports to have k
Page 247 and 248:
Appendix C C-59 Register 0516 DRAFT
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Appendix C C-65 Register 0A16 Figur
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Appendix C C-71 Table C-37. CF Fiel
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Appendix CD CD-3 ACTIONS EVENTS DRA
Page 289 and 290:
Page 291 and 292:
Appendix CD CD-7 too many broadcast
Page 293 and 294:
Page 295 and 296:
Page 297 and 298:
Appendix CD CD-13 CD.2.4.4.1.2 Poss
Page 299 and 300:
Appendix CD CD-15 D.2.4.4.2.1.2 A32
Page 301 and 302:
Appendix CD CD-17 AP/FD mode V/S-FP
Page 303 and 304:
Page 305 and 306:
Page 307 and 308:
Appendix CD CD-23 CD.2.4.7.5 BINARY
Page 309 and 310:
Page 311 and 312:
Appendix CD CD-27 Zone no. DRAFT -
Page 313 and 314:
Page 315 and 316:
Appendix CD CD-31 CD.4 IMPLEMENTATI
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
Page 323 and 324:
Page 325 and 326:
Appendix DE DE-7 c. for GNSS, the p
Page 327 and 328:
Appendix DE DE-9 MB FIELD DRAFT - W
Page 329 and 330:
Appendix DE DE-11 MB FIELD DRAFT -
show all

Technical Provisions for Mode S Services and Extended Squitter

Create successful ePaper yourself

Delete template?

Save as template?