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NORTH-SOUTH VELOCITY
Normal
Supersonic
Normal
Supersonic
NORMAL: LSB = 1 knot
All zeros = no velocity information
Velocity
1 0 kt
2 1 kt
3 2 kt
- -
1 022 1021 kt
1 023 rl 021.5 kt
Horizontal
Velocity
Error (95%)
Unknown
<10 m/s
<3 mls
<1 mls
<0.3 mls
Reserved
Reserved
Resewed
SUPERSONIC: LSB = 4 knots
All zeros = no velocity information
Value Velocity
1 0 kt
2 4 kt
3 8 kt
- -
1 022 4 084 kt
1 023 r4 086 kt
Vertical
Velocity Error
(95%)
Unknown
d5.2 m/s (50 fps)
14.6 mls (15 fps)
c1.5 mls (5 fps)
e0.46 mls (1.5 fps)
SOURCE BIT for vertical rate: 0 = GNSS, 1 = Baro
SlGN BIT for vertical rate: 0 = Up, 1 = Down
VERTICAL RATE
All zeros = no vertical rate information; LSB = 64 ftlmin
Vertical rate
1 0 Wmin
2 64 Wmin
-
51 0 32 576 Wmin
51 1 >32 608 Wmin
RESERVED FOR TURN INDICATOR
GNSS ALT. SlGN BIT: 0 = Above bar0 alt, 1 = Below bar0 alt
GNSS ALT. DIFFERENCE FROM BARO. ALT.
All zeros = no information; LSB = 25 fi
Difference
1 0 ft
2 25 ft
- -
126 3125ft
127 23 137.5 ft
Part Z Annex 10 - Aerorzaritical Telecomnzuniciltions
Table 2-9b. BDS code 0,9 - Extended squitter airborne velocity
(Subtypes 3 and 4: airspeed and heading)
MB FIELD
1
PURPOSE: To provide additional state information
0
for both normal and supersonic flight based on
airspeed and heading.
FORMAT TYPE CODE = 19 0
1 This format shall only be used if velocity over
1 ground is not available.
I SUBTYPE 4 1
(1 CATEGORY - VELOCITY
7
8
9
10
11
(NUC,)
STATUS BIT - 0 = Magnetic heading not available, 1 = available
MSB = 180" I MAGNETIC HEADING (specified in 2.3.5.5)
1
1
LSB = 36011 024' -
AIRSPEED TYPE 0 = IAS. 1 = TAS
0 Subtype shall be coded as follows:
0
AIRSPEED
NORMAL: LSB = 1 knot
All zeros = no velocity information
-Value Velocity
1 0 kt
2 1 kt
3 2 kt
INTENT CHANGE FLAG (specified in 2.3.5.3) Code
IFR CAPABILITY FLAG
NAVIGATION UNCERTAINTY 0
SUPERSONIC: LSB = 4 knots
All zeros = no velocity information
Value Velocity
1 0 kt
2 4 kt
3 8 kt
- -
SOURCE BIT FOR VERTICAL RATE: 0 = GNSS, 1 = Baro
-S-IG N BIT FOR VERTICAL RATE: 0 = Up, 1 = Down
VERTICAL RATE
Velocity
All zeros = no vertical rate information; LSB = 64 ft/mln
WE Vertical rate
1 0 ftlmin
2 64 ftlmin
- -
510 32 576 Wmin
511 232 608 Wmin
Type
baro alt, 1 = Below bar0 alt)
FROM BARO. ALT.
Reserved
All zeros = no information; LSB = 25 fl
Value Difference
1 Oft
2 25 ft
- -
126 3125 ft
Ground Normal
speed
Airspeed, Normal
5 I Reserved
6 1 Reserved
1 Reserved
IFR capability shall be coded as follows:
0 = Transmitting aircraft has no capability for
ADS-B-based conflict detection or higher
level applications.
1 = Transmitting aircraft has capabil~tyfo r
ADS-B-based conflict detection and higher
level applications.
-28-11 1/02
No. 77
Annex 10 - Aeronautical Telecotnmunications Volume IZI
Table 2-10. BDS code 0,A - Extended squitter event-driven information
2811 1/02
No. 77
MB
-
1
2
3
4
5
6
7
8 -
9
10
11
12
13
14
15
-16
17
18
19
20
21
22
23
24 -
25
26
27
28
29
30
3 1
32 -
33
34
35
36
37
38
39
-40
41
42
43
44
45
46
47
FIELD
PURPOSE: To provide a flexible means to squitter messages
other than position, velocity and identification.
1) A message inserted in this register (or an equivalent
transmit buffer) shall be broadcast once by the transponder
at the earliest opportunity.
2) Formats for messages using this protocol shall be specified
in BDS 6.1 to 6,F.
3) The GFM (2.5) shall be responsible for ensuring pseudorandom
timing and for observing the maximum transmission
rate for this register of 2 per second (2.5.5.1).
4) Read-out (if required) of this register shall be accomplished
by extracting the contents of the appropriate BDS register
6,l to 6,F.
Note.- The data in this register is not intended for
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