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Technical Provisions for Mode S Services and Extended Squitter

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Appendix A A-79<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 1=West (e.g. 315 = -45 degrees)<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<br />

18<br />

19 Range = [0, 1023] knots<br />

20<br />

21<br />

22<br />

23 LSB = 1 knot<br />

24 STATUS<br />

25 MSB = 2.048 MACH<br />

26<br />

27<br />

28 MACH<br />

29<br />

30 Range = [0, 4.092] MACH<br />

31<br />

32<br />

33<br />

34 LSB = 2.048/512 MACH<br />

35 STATUS<br />

36 SIGN 1 = Below<br />

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

38<br />

39<br />

40 BAROMETRIC ALTITUDE RATE<br />

41<br />

42 Range = [–16 384, +16 352] feet/minute<br />

43<br />

44<br />

45 LSB = 8 192/256 = 32 feet/minute<br />

46 STATUS<br />

47 SIGN 1 = Below<br />

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

49<br />

50<br />

51 INERTIAL VERTICAL VELOCITY<br />

52<br />

53 Range = [–16 384, +16 352] feet/minute<br />

54<br />

55<br />

56 LSB = 8 192/256 = 32 feet/minute<br />

Table A-2-96. BDS code 6,0 — Heading <strong>and</strong> speed report<br />

PURPOSE: To provide heading <strong>and</strong> speed data to ground systems.<br />

1) If the value of a parameter from any source exceeds the range<br />

allowable in the register definition, the maximum allowable value in the<br />

correct positive or negative sense shall be used instead.<br />

Note.— This requires active intervention by the GFM.<br />

2) The data entered into the register shall whenever possible be derived<br />

from the sources that are controlling the aircraft.<br />

3) The LSB of all fields shall be obtained by rounding.<br />

4) When barometric altitude rate is integrated <strong>and</strong> smoothed with inertial<br />

vertical velocity (baro-inertial in<strong>for</strong>mation), it shall be transmitted in the<br />

Inertial Vertical Velocity field.<br />

Note 1.— Barometric Altitude Rate contains values solely derived from<br />

barometric measurement. The Barometric Altitude<br />

Rate is usually very unsteady <strong>and</strong> may suffer from<br />

barometric instrument inertia.<br />

Note 2.— The Inertial Vertical Velocity is also providing in<strong>for</strong>mation<br />

on vertical movement of the aircraft but it comes from<br />

equipments (IRS, AHRS) using different sources used <strong>for</strong><br />

navigation. The in<strong>for</strong>mation is a more filtered <strong>and</strong> smooth<br />

parameter.<br />

Note 3. — Two’s complement coding is used <strong>for</strong> all signed fields as<br />

specified in §A.2.2.2.<br />

Note 4.— Additional implementation guidelines are provided in<br />

§CD.2.4.6.<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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