Technical Provisions for Mode S Services and Extended Squitter

A-48 Technical Provisions for Mode S Services and Extended Squitter
MB FIELD
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Table A-2-11. BDS code 0,B — Air/air state information 1 (aircraft state)
1 STATUS
2 MSB = 1 024 knots
3
4
5 TRUE AIR SPEED
6
7
8 Range = [0, 2 047] knots
9
10
11
12 LSB = 1.0 knot
13 SWITCH (0 = Magnetic heading, 1 = True heading)
14 STATUS
15 SIGN
16 MSB = 90 degrees
17
18 HEADING
19
20
21 Range = [–180, +180] degrees
22
23
24 LSB = 360/1 024 degrees
25 STATUS
26 SIGN
27 MSB = 90 degrees
28
29
30
31 TRUE TRACK ANGLE
32
33
34
35
36 Range = [–180, +180] degrees
37
38
39
40 LSB = 360/32 768 degrees
41 STATUS
42 MSB = 1 024 knots
43
44
45
46 GROUND SPEED
47
48
49
50
51 Range = [0, 2 048] knots
52
53
54
55 LSB = 1/8 knot
56 RESERVED
PURPOSE: To report threat aircraft state information in order
to improve the ability of ACAS to evaluate the threat and select
a resolution manoeuvre.
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