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Technical Provisions for Mode S Services and Extended Squitter

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Appendix B B-49<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 B-3-4b. TIS-B velocity messages (Subtypes 3 <strong>and</strong> 4: Air Referenced Velocity)<br />

1 MSB 1<br />

2 0<br />

3 FORMAT TYPE CODE = 19 0<br />

4 1<br />

5 LSB 1<br />

6 SUBTYPE 3 0 SUBTYPE 4 1<br />

PURPOSE: To provide velocity in<strong>for</strong>mation <strong>for</strong> aircraft that are not<br />

equipped with 1 090 MHz ADS-B when the TIS-B service is based<br />

on high quality surveillance data.<br />

Subtype shall be coded as follows:<br />

7 1 0 Code Velocity Type<br />

8 1 0 0 Reserved<br />

9<br />

10<br />

IMF (specified in §B.3.4.4.2)<br />

MSB<br />

1<br />

2<br />

GroundSpeed<br />

Normal<br />

Supersonic<br />

11<br />

12<br />

NAVIGATION ACCURACY CATEGORY FOR POSITION<br />

(NACP) (specified in §B.2.3.10.7)<br />

3<br />

4<br />

Airspeed,Heading<br />

Normal<br />

Supersonic<br />

13 LSB 5 Reserved<br />

14 HEADING STATUS BIT: 0 = Not Available, 1 = Available 6 Reserved<br />

15<br />

16<br />

17<br />

MSB = 180 degrees 7 Reserved<br />

18 HEADING<br />

Note 1.— The “vertical rate” <strong>and</strong> “geometric height difference<br />

19<br />

20<br />

21<br />

22<br />

23<br />

(specified in §B.2.3.5.6)<br />

from barometric altitude” fields <strong>for</strong> surface aircraft<br />

do not need to be processed by TIS-B receivers<br />

24 LSB = 360/1 024 degrees<br />

25 AIRSPEED TYPE: 0 = IAS, 1 = TAS<br />

26 AIRSPEED<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 />

29 Value Velocity Value Velocity<br />

30 1 0 kt 1 0 kt<br />

Note 2.— When bit 36 = 0, then bits 37 – 56 contain the fields<br />

31<br />

32<br />

2<br />

3<br />

1 kt<br />

2 kt<br />

2<br />

3<br />

4 kt<br />

8 kt<br />

shown in the left h<strong>and</strong> side of this page. When bit 36 = 1,<br />

then bits 37 – 56 contain the fields shown below.<br />

33 … … … …<br />

34 1 022 1 021 kt 1 022 4 084 kt<br />

35 1 023 >1 021.5 kt 1 023 >4 086 kt<br />

36 GEO FLAG (GEO = 0) 36 GEO FLAG (GEO = 1)<br />

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

38 VERTICAL RATE 38 VERTICAL RATE<br />

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

40 Value Vertical Rate 40 Value Vertical Rate<br />

41 1 0 ft/min 41 1 0 ft/min<br />

42 2 64 ft/min 42 2 64 ft/min<br />

43 … … 43 … …<br />

44 510 32 576 ft/min 44 510 32 576 ft/min<br />

45 511 >32 608 ft/min 45 511 >32 608 ft/min<br />

46 46<br />

47 NIC SUPPLEMENT (see §B.2.3.10.6) 47 NIC SUPPLEMENT (see §B.2.3.10.6)<br />

48 MSB 48 RESERVED<br />

49 NAVIGATIONAL ACCURACY CATEGORY FOR VELOCITY 49 DIFFERENCE SIGN BIT: (0=above baro alt, 1=below baro alt)<br />

50 LSB (NACV) (see §B.2.3.5.5) 50 GEOMETRIC HEIGHT DIFFERENCE FROM BARO. ALT.<br />

51 MSB SURVEILLANCE INTEGRITY LEVEL (SIL) 51 All zeros = no in<strong>for</strong>mation; LSB = 25 ft<br />

52 LSB (see §B.2.3.10.9) 52 Value Difference<br />

53 RESERVED 53 1 0 ft<br />

54 54 2 25 ft<br />

55 TRUE/MAGNETIC HEADING (0 = True, 1 = Magnetic) 55 126 3 125 ft<br />

56 RESERVED 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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