Technical Provisions for Mode S Services and Extended Squitter

Appendix A A-49
MB FIELD
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Table A-2-12. BDS code 0,C — Air/air state information 2 (aircraft intent)
1 STATUS
2 MSB = 32 768 feet
3
4
5
6 LEVEL OFF ALTITUDE
7
8 Range = [0, 65 520] feet
9
10
11
12
13 LSB = 16 feet
14 STATUS
15 SIGN
16 MSB = 90 degrees
17
18
19 NEXT COURSE (TRUE GROUND TRACK)
20
21 Range = [–180, +180] degrees
22
23
24 LSB = 360/1 024 degrees
25 STATUS
26 MSB = 128 seconds
27
28 TIME TO NEXT WAYPOINT
29 All ONEs = time exceeds 255 seconds
30
31
32 Range = [0, 256] seconds
33
34 LSB = 0.5 seconds
35 STATUS
36 SIGN
37 MSB = 8 192 ft/min
38
39 VERTICAL VELOCITY (UP IS POSITIVE)
40
41 Range = [–16 384, +16 320] ft/min
42
43
44 LSB = 64 ft/min
45 STATUS
46 SIGN
47 MSB = 45 degrees
48
49 ROLL ANGLE
50
51 Range = [–90, +89] degrees
52
53 LSB = 45/64 degrees
54
55 RESERVED
56
PURPOSE: To report threat aircraft state information in order to
improve the ability of ACAS to evaluate the threat and select
a resolution maneuver.
Note.— Two’s complement coding is used for all signed fields as
specified in §A.2.2.2.
Draft
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris