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Table 2-5. BDS code 0,5 - Extended squitter airborne position
MB FIELD
PURPOSE: To provide accurate airborne position information. -
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
48 -
49
50
51
52
53
54
55
56
FORMAT TYPE CODE Surveillance status shall be coded as follows:
(specified in 2.3.1)
SURVEILLANCE STATUS
(specified in 2.3.2.6)
SINGLE ANTENNA FLAG (SAF) (specified in 2.3.2.5)
ALTITUDE (specified by the format type code)
This is (1) the altitude code (AC) as specified in
3.1.2.6.5.4 of Annex 10, Volume IV but with the M-bit
removed or (2) the GNSS height (HAE)
TIME (T) (specified in 2.3.2.2)
CPR FORMAT (F) (specified in 2.3.2.1)
MSB
ENCODED LATITUDE
(CPR airborne format specified in 2.6.1 to 2.6.5)
LSB
MSB
ENCODED LONGITUDE
(CPR airborne format specified in 2.6.1 to 2.6.5)
LSB
0 = No condition information
1 = Permanent alert (emergency condition)
2 - Temporary alert (change in Mode A identity code other
than emergency condition)
3 = SPl condition
Codes 1 and 2 shall take precedence over code 3.
When horizontal position information is unavailable, but altitude
information is available, the airborne position message shall be
transmitted with a format type code of zero in bits 1-5 and the
barometric pressure altitude in bits 9 to 20. If neither horizontal
position nor barometric altitude information is available, then all
56 bits of BDS 0,5 shall be zeroed. The zero format type code
field shall indicate that latitude and longitude information is
unavailable, while the zero altitude field shall indicate that
altitude information is unavailable.
Part Z Annex 10 - Aeronautical Telecommunications
Table 2-6. BDS code 0,6 - Extended squitter surface position
-
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
54
55
2811 1/02
No. 77
FORMAT TYPE CODE
(specified in 2.2.3.1)
MOVEMENT
(specified in 2.3.3.1)
STATUS for ground track: 0 = Invalid. 1 = Valid
MSB = 180
(specified in 2.3.3.2)
GROUND TRACK (TRUE)
LSB = 3601128
TIME (T) (specified in 2.3.2.2)
CPR FORMAT (F) (specified in 2.3.2.1)
MSB
ENCODED LATITUDE 17 bits
(specified in 2.6.1 to 2.6.4 and 2.6.6)
LSB
MSB
ENCODED LONGITUDE 17 bits
(specified in 2.6.1 to 2.6.4 and 2.6.6)
LSB
MB FIELD
PURPOSE: To provide accurate surface position information.
Annex 10 - Aeronautical Telecommunications Volume I11
Table 2-7. BDS code 0,7 - Extended squitter status
MB FIELD
PURPOSE: To provide information on the capability and status
of the extended squitter rate of the transponder.
Transmission rate subfield (TRS) shall be coded as
follows:
0 = No capability to determine surface squitter rate
1 = High surface squitter rate selected
2 = Low surface squitter rate selected
3 = Reserved
Altitude type subfield (ATS) shall be coded as follows:
0 = Barometric altitude
1 = GNSS height (HAE)
Aircrafl determination of surface squitter rate:
For aircraft that have the capability to automatically determine
their surface squitter rate, the method used to switch between
the high and low transmission rates shall be as follows:
a) Switching from high to low rate: Aircraft shall switch from
high to low rate when the on-board navigation unit reports
that the aircraft's position has not changed more than
10 metres in a 30 second sampling interval. The algorithm
used to control the squitter rate shall save the aircraft's
position at the time that low rate is selected.
b) Switching from low to high rate: Aircraft shall switch from low
to high rate as soon as the aircraft's position has changed
by 10 metres or more since the low rate was selected
For transponder-based implementations, the automatically
　
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