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Technical Provisions for Mode S Services and Extended Squitter

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Appendix A A-45<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 />

Table A-2-9a. BDS code 0,9 — <strong>Extended</strong> squitter airborne velocity<br />

(Subtypes 1 <strong>and</strong> 2: Velocity over ground)<br />

1 MSB 1<br />

PURPOSE: To provide additional state in<strong>for</strong>mation <strong>for</strong> both<br />

2 0<br />

normal <strong>and</strong> supersonic flight.<br />

3 FORMAT TYPE CODE = 19 0<br />

4 1 Subtype shall be coded as follows:<br />

5 LSB 1<br />

6 SUBTYPE 1 0 SUBTYPE 2 0 Code Velocity Type<br />

7 0 1 0 Reserved<br />

8<br />

9<br />

1<br />

INTENT CHANGE FLAG (specified in §A.2.3.5.3)<br />

0 1<br />

2<br />

GroundSpeed<br />

Normal<br />

Supersonic<br />

10<br />

11<br />

IFR CAPABILITY FLAG<br />

MSB NAVIGATION UNCERTAINTY<br />

3<br />

4<br />

Airspeed,Heading<br />

Normal<br />

Supersonic<br />

12 CATEGORY FOR VELOCITY 5 Reserved<br />

13 LSB (NUCR) 6 Reserved<br />

14 DIRECTION BIT <strong>for</strong> E-W Velocity: 0 = East, 1 = West 7 Reserved<br />

15 EAST — WEST VELOCITY<br />

16 NORMAL: LSB = 1 knot SUPERSONIC: LSB = 4 knots IFR capability shall be coded as follows:<br />

17<br />

18<br />

19<br />

All zeros = no velocity in<strong>for</strong>mation<br />

Value Velocity<br />

1 0 kt<br />

All zeros = no velocity in<strong>for</strong>mation<br />

Value Velocity<br />

1 0 kt<br />

0 = Transmitting aircraft has no capability <strong>for</strong> ADS-Bbased<br />

conflict detection or higher level (class A1 or<br />

above) applications.<br />

20 2 1 kt 2 4 kt<br />

21<br />

22<br />

23<br />

3<br />

…<br />

1 022<br />

2 kt<br />

…<br />

1 021 kt<br />

3<br />

…<br />

1 022<br />

8 kt<br />

…<br />

4 084 kt<br />

1 = Transmitting aircraft has capability <strong>for</strong> ADS-B-based<br />

conflict detection <strong>and</strong> higher level (class A1 or<br />

above) applications.<br />

24 1 023 >1 021.5 kt 1 033 >4 086 kt<br />

25 DIRECTION BIT <strong>for</strong> N-S Velocity: 0 = North, 1 = South<br />

26 NORTH — SOUTH VELOCITY NUCR shall be coded as follows:<br />

27 NORMAL: LSB = 1 knot SUPERSONIC: LSB = 4 knots<br />

28 All zeros = no velocity in<strong>for</strong>mation All zeros = no velocity in<strong>for</strong>mation<br />

Horizontal<br />

Vertical<br />

29<br />

30<br />

Value<br />

1<br />

Velocity<br />

0 kt<br />

Value<br />

1<br />

Velocity<br />

0 kt<br />

NUCR Velocity<br />

Error (95%)<br />

Velocity<br />

Error (95%)<br />

31 2 1 kt 2 4 kt 0 Unknown Unknown<br />

32 3 2 kt 3 8 kt 1 < 10 m/s < 15.2 m/s (50 fps)<br />

33 … … … … 2 < 3 m/s < 4.6 m/s (15 fps)<br />

34 1 022 1 021 kt 1 022 4 084 kt 3 < 1 m/s < 1.5 m/s (5 fps)<br />

35 1 023 >1 021.5 kt 1 023 >4 086 kt 4 < 0.3 m/s < 0.46 m/s (1.5 fps)<br />

36 SOURCE BIT FOR VERTICAL RATE: 0 = GNSS, 1 = Baro<br />

37 SIGN BIT FOR VERTICAL RATE: 0 = Up, 1 = Down<br />

38 VERTICAL RATE<br />

39 All zeros = no vertical rate in<strong>for</strong>mation; LSB = 64 ft/min<br />

40 Value Vertical Rate<br />

41 1 0 ft/min<br />

42 2 64 ft/min<br />

43 … …<br />

44 510 32 576 ft/min<br />

45<br />

46<br />

511 >32 608 ft/min<br />

47<br />

48<br />

RESERVED FOR TURN INDICATOR<br />

49 GNSS ALT. SIGN BIT: 0 = Above baro alt., 1 = Below baro alt.<br />

50 GNSS ALT. DIFFERENCE FROM BARO. ALT.<br />

51 All zeros = no in<strong>for</strong>mation; LSB = 25 ft<br />

52 Value Difference<br />

53 1 0 ft<br />

54 2 25 ft<br />

55 126 3 125 ft<br />

56 127 3 137.5 ft<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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