Technical Provisions for Mode S Services and Extended Squitter
Technical Provisions for Mode S Services and Extended Squitter
Technical Provisions for Mode S Services and Extended Squitter
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DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris<br />
Appendix C C-89<br />
C.5.2.2.7 Emergency/Priority Status<br />
The Emergency/Priority Status conveyed in the Aircraft Status Message (Table A-2-97) will shall be directly<br />
mapped into the ADS-B Report, Emergency/Priority Status field as specified in §C.2.3.7.3. However, it must<br />
be noted that in the<br />
Note.— In the ADS-B Version Zero (0) Aircraft <strong>Extended</strong> <strong>Squitter</strong> Status Message, the<br />
Emergency/Priority Status subfield conveys a subset of the Emergency/Priority Status categories allowed by<br />
an ADS-B Report.<br />
C.5.2.2.8 Capability Codes<br />
The ADS-B Version Zero (0) Operational Status Message (Table A-2-101) conveys Control Codes with<br />
in<strong>for</strong>mation limited to TCAS <strong>and</strong> CDTI capabilities, as shown in Table C-42. The ADS-B Version Zero (0)<br />
Aircraft Operational Status Message <strong>for</strong>mat specifies coding only <strong>for</strong> the case of CC-4 (En Route<br />
Operational Capabilities). There<strong>for</strong>e the CC-1, CC-2 <strong>and</strong> CC-3 subfields, as specified in Table A-2-101, are<br />
toshall be considered reserved <strong>and</strong> not used <strong>for</strong> ADS-B Version Zero (0) ADS-B Messages.<br />
For the case of CC-4, this 4-bit (bits 9-12) subfield will shall be mapped to the Capability Code field of the<br />
ADS-B Report as shown in Table C-42. The remaining bits within the ADS-B Report Capability Code field<br />
will shall be set to Zero (0). If no Aircraft Operational Status Message has been received, then the Capability<br />
Code field may shall be omitted from the ADS-B Report.<br />
Table C-42. En-Route Operational Capabilities Encoding<br />
CC-4 Encoding: En Route Operational Capabilities<br />
CC-4 Coding<br />
Mapping to ADS-B Report<br />
(Version Zero (0)<br />
Meaning<br />
Capability Code field<br />
Messages)<br />
(Version Zero (0) Messages)<br />
Bit 9,10 Bit 11,12<br />
CC Field Bits 11, 12<br />
0 0<br />
TCAS Operational or unknown;<br />
CDTI not Operational or<br />
unknown<br />
10<br />
0 0<br />
0 1<br />
TCAS Operational or unknown;<br />
CDTI Operational<br />
11<br />
1 0<br />
TCAS not Operational; CDTI<br />
not Operational or unknown<br />
00<br />
1 1<br />
TCAS not Operational; CDTI<br />
Operational<br />
01<br />
Draft<br />
C.5.2.2.9 Operational <strong>Mode</strong>s<br />
ADS-B Version Zero (0) messages con<strong>for</strong>mant to <strong>for</strong>mats in Appendix A, do not define coding <strong>for</strong> the<br />
Operational <strong>Mode</strong> subfield of the Operational Status Message (Table A-2-101). There<strong>for</strong>e the OM-1, OM-2,<br />
OM-3 <strong>and</strong> OM-4 subfields, as shown in Table A-2-101, are toshall be considered reserved <strong>and</strong> not used <strong>for</strong><br />
ADS-B Version Zero (0) Messages. ADS-B Reports <strong>for</strong> target aircraft/vehicles broadcasting ADS-B Version<br />
Zero (0) ADS-B Messages will shall not include the Operational <strong>Mode</strong> field in the report.<br />
C.5.2.2.10 Navigation Accuracy Category <strong>for</strong> Position (NACP)<br />
The ADS-B Version Zero (0) ADS-B Surface <strong>and</strong> Airborne Position Messages have associated with each<br />
specific TYPE code a corresponding Horizontal Protection Limit <strong>and</strong> a 95% Containment Radius (i.e.,<br />
position error). For a ADS-B Version Two (2) Receiving Subsystem, the TYPE codes of the received ADS-B<br />
Version Zero (0) Messages will shall be mapped into the value of the Navigation Accuracy Category <strong>for</strong><br />
Position (NAC P) as shown in Table C-43 <strong>for</strong> the purpose of generating the ADS-B Report.<br />
DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris