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Technical Provisions for Mode S Services and Extended Squitter

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Appendix DE DE-11<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<br />

2 RESERVED<br />

3<br />

4<br />

5 STATUS<br />

6 MSB = 256 knots<br />

7<br />

8<br />

9 WIND SPEED<br />

10<br />

11 Range = [0, 511] knots<br />

12<br />

13<br />

14 LSB = 1 knot<br />

15 STATUS<br />

16 MSB = 180 degrees<br />

17<br />

18 WIND DIRECTION (True)<br />

19<br />

20 Range = [0, 360] degrees<br />

21<br />

22<br />

23 LSB = 180/128 degrees<br />

24 STATUS<br />

25 SIGN<br />

26 MSB = 64°C<br />

27<br />

28<br />

29 STATIC AIR TEMPERATURE<br />

30<br />

31 Range = [-128, +128] ºC<br />

32<br />

33<br />

34<br />

35 LSB = 0.125°C<br />

36 STATUS<br />

37 MSB = 1 024 hPa<br />

38<br />

39<br />

40 AVERAGE STATIC PRESSURE<br />

41<br />

42 Range = [0, 2 047] hPa<br />

43<br />

44<br />

45<br />

46<br />

47 LSB = 1 hPa<br />

48 TURBULENCE FLAG<br />

49 STATUS<br />

50 MSB = 64%<br />

51<br />

52<br />

53 HUMIDITY<br />

54 Range = [0, 127] %<br />

55<br />

56 LSB = 1 %<br />

Table DE-2-68. BDS Code 4,4 — Meteorological routine air report<br />

PURPOSE: To allow meteorological data to be collected by ground systems.<br />

1) The definition of bit 48: Turbulence flag:<br />

0 = signifies turbulence data not available in Register 4516.<br />

1 = signifies turbulence data available in Register 4516.<br />

Note 1.— The average static pressure is not a requirement of Annex 3.<br />

Note 2.— Humidity calculation may result in values greater than 100%.<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.— The requirement <strong>for</strong> the range of wind speeds in Annex 3 is<br />

from 0 to 250 knots.<br />

Note 5.— The requirement <strong>for</strong> the range of static air temperature in<br />

Annex 3 is from –80°C to +60°C.<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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