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Technical Provisions for Mode S Services and Extended Squitter

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A-76 <strong>Technical</strong> <strong>Provisions</strong> <strong>for</strong> <strong>Mode</strong> S <strong>Services</strong> <strong>and</strong> <strong>Extended</strong> <strong>Squitter</strong><br />

MB FIELD<br />

DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris<br />

1 STATUS<br />

2 SIGN<br />

3 MSB = 90 degrees<br />

4<br />

5<br />

6 MAGNETIC HEADING<br />

7<br />

8 Range = [–180, +180] degrees<br />

9<br />

10<br />

11<br />

12 LSB = 90/512 degrees<br />

13 STATUS<br />

14 MSB = 512 knots<br />

15<br />

16<br />

17 INDICATED AIRSPEED (IAS)<br />

18<br />

19 Range = [0, 1 023] knots<br />

20<br />

21<br />

22<br />

23 LSB = 1 knot<br />

24 STATUS<br />

25 MSB = MACH 2.048<br />

26<br />

27<br />

28 MACH NUMBER<br />

29<br />

30 Range = [0, 4.096] MACH<br />

31<br />

32<br />

33 LSB = MACH 0.008<br />

34 STATUS<br />

35 MSB = 1 024 knots<br />

36<br />

37<br />

38<br />

39<br />

40 TRUE AIRSPEED<br />

41<br />

42 Range = [0, 2 048] knots<br />

43<br />

44<br />

45<br />

46 LSB = 0.5 knots<br />

47 STATUS<br />

48 SIGN<br />

49 MSB = 8 192 feet/minute<br />

50<br />

51 ALTITUDE RATE<br />

52<br />

53 Range = [–16 384, +16 320] feet/minute<br />

54<br />

55<br />

56 LSB = 64 feet/minute<br />

Table A-2-83. BDS code 5,3 — Air-referenced state vector<br />

PURPOSE: To provide the ATC system with current measured values of<br />

magnetic heading, IAS/MACH, altitude rate <strong>and</strong> TAS.<br />

Note.— Two’s complement coding is used <strong>for</strong> all signed fields as<br />

specified in §A.2.2.2.<br />

Draft<br />

DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris

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