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extraction using the GlCB or ACAS cross-link protocols.
55
- -.
Purt Z Annex 10 - Aero~zautical Telecommu~zicatio~~s
Table 2-11. BDS code 0,B - Airlair state information 1 (aircraft state)
ME FIELD
STATUS PURPOSE: To report threat aircraft state information in order to
MSB = 1 024 kt improve the ability of ACAS to evaluate the threat and select a
resolution manoeuvre.
TRUE AIR SPEED
Range = [O-,2 047 kt]
LSB = 1,O kt
SWITCH (0 = Maanet~c head~ns. 1 = True head~nsl
HEADING
Range = [-180, + 1791
LSB = 36011 024 degrees
STATUS
SIGN
MSB = 90 degrees
TRUETRACKANGLE
Range = [-180, +I791
LSB = 360132 768 degrees
MSB = 1 024 kt
GROUND SPEED
Range = [O, 2 0471
LSB = 1/16 kt
2811 1101
No. 77
Volume IfI
Table 2-12. BDS code 0,C - Airlair state information 2 (aircraft intent)
MB FIELD
STATUS PURPOSE: To provide threat aircraft intent information in order
MSB = 51 200 ft
to improve the ability of ACAS to evaluate the threat and select
a resolution manoeuvre.
LEVEL OFF ALTITUDE
Range = [O, 102 3751
LSB = 16 ft
STATUS
SlGN
MSB = 90 degrees
NEXT COURSE (TRUE GROUND TRACK)
Range = [+179,-1 801
LSB = 36011 024 degrees
STATUS
MSB = 128 seconds
TIME TO NEXT WAYPOINT
All ones = time exceeds 254 seconds
Range = [O, 2541
LSB = 1 second
STATUS
SlGN
MSB 8 192 Wrnin
VERTICAL VELOCITY (UP IS POSITIVE)
Range = [+I6 352, -16 3521
LSB = 32 Wm~n
-. " , - .-
STATUS . -,
SIGN
MSB = 45 degrees
ROLL ANGLE
Range = [+89, -891
LSB = 3601256 degrees
MIL INTERCEPT BIT (0 = no intercept; 1 = intercept)
RESERVED
- . . - -.
28111102
No. 77
Part Z Annex 18 - Aeronautical Telecornrnuniciltions
Table 2-16. BDS code 1,O - Data link capability report
MB FIELD
PURPOSE: To report the data link capability of the Mode S
transponder/data link installation.
The coding of this register shall conform to:
1) Annex 10, Volume 111. 5.2.9.
2) When bit 25 is set to 1, it shall indicate that at least one
Mode S specific service is supported and the particular
Continuation flag (see 9) capability reports shall be checked.
Note - Registers accessed by BDS codes 0,2; 0.3; 0,4; 1,O;
2,O and 3,O do not affect the setting of bit 25.
Reserved for ACAS
17
18
19
20
2 1
22
Mode S subnetwork version number
23
24
25
26
Aircraft identification capability
Sauitter capabilitv subfield (SCS) (see 5)
Transponder enhanced protocol indicator (see 4)
Mode S specific services capability (see 2)
ij 30
31
~ .~
Surveillance identifier (SI) (see 6)
Common usage GlCB capability report (see 7)
Uplink ELM capability
Downlink ELM capability
I RESERVED FORACAS
Bit array indicating the support status of DTE
subaddresses 0 to 15 (see 3 and 8)
3) Starting from the MSB, each subsequent bit position shall
represent the DTE subaddress in the range from 0 to 15.
4) The enhanced protocol indicator shall denote a Level 5
transponder when set to 1 and a Level 2 to 4 transponder
when set to 0.
5) The squitter capability subfield (SCS) shall be interpreted as
follows:
0 = squitter registers are not updated
1 = squitter registers are being updated
6) The surveillance identifier (SI) bit shall be interpreted as
follows:
0 = no surveillance ~dentifier code capability
1 = surveillance identifier code capability
7) Bit 36 shall be toggled each time the common usage GlCB
capability report (BDS code 1,7) changes. To avoid the
generation of too many broadcast capability report changes,
BDS code 1,7 shall be sampled at approximately one minute
intervals to check for changes.
8) The current status of the on-board DTE shall be periodically
reported to the GDLP by on-board sources. Since a change
in this field results in a broadcast of the capability report,
status inputs shall be sampled at approximately one minute
intervals.
9) In order to determine the extent of any continuation of the
data link capability report (into those registers reserved for
this purpose: BDS 1,l to BDS 1,6), bit 9 shall be reserved
as a 'continuation flag' to indicate if the subsequent register
shall be extracted. For example: upon detection of bit 9 = 1
in BDS 1,O then BDS 1 ,I shall be extracted. If bit 9 = 1 in
BDS 1,1 then BDS 1,2 shall be extracted, and so on (up to
BDS 1,5). Note that if bit 9 = 1 in BDS 1,6 then this shall be
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