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three parameters are invalid and is identical to the status bit
in BDS 5.2.
2) The required valid range for latitude is +90 degrees to
-90 degrees, but the parameter shall be coded with an
MSB of 90 degrees to allow the use of the same coding
algorithm as for longitude.
3) The source of the information in this register shall be
the same as that indicated in the FOMtSOURCE field of
BDS 5,2.
LONGITUDE
2811 1102
No. 77
Part 1 Alznex 10 - Aeronautical Telecontrrvr~tvicatio~z~~
MB FIELD
Table 2-82. BDS code 5,2 - Position report fine
STATUS (see 1)
FOM/SOURCE I : it
LATITUDE FlNE
PURPOSE: To provide a high-precision three-dimensional
report on aircraft position when used in conjunction with
BDS 5,l. Information on the source Of the data is included.
14
15
-16
17
18
19
20
2 1
22
23
-24
25
26
27
28
29
30
31
-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
FOMISOURCE coding:
Range = [0, 18011 281
LSB = 9011 6 777 21 6 degrees
MSB = 901128 degrees
LONGITUDE FINE
Range = [O, 1801128]
LSB = 9011 6 777 21 6 degrees
SIGN
MSB = 65 536 f l
PRESSURE
ALTITUDE
or
GNSS HEIGHT (HAE)
Range = [-I 000, 126 7521
LSB = 8 ft
The decimal value of the binary-coded (f~gureo f mer~t)
FOMISOURCE parameter shall be interpreted as follows:
Loss of navigational capability
RNP 20 (e.g. INS data) pressure altitude
RNP 5 (e.g. VORIDME) pressure altitude
RNP 1 (e.g. DMEIDME or GNSS) pressure altitude
Reserved for differential GNSS (circular position
error (CPE) 10 m) pressure altitude
Reserved for differential GNSS (CPE 2.5 m)
pressure altitude
Reserved
RNP 1 (e.g. DMEIDME or GNSS) GNSS height
Reserved for differential GNSS (CPE 10 m) height
Reserved for differential GNSS (CPE 2.5 m) height
Reserved
Note.- RNP signifies required navigation performance.
Suitable RNP categories have not yet been defined for values
below 1; therefore, CPE is used.
1) The single status bit (bit 1) shall be set to 0 i f any of the
three parameters are invalid and is identical to the status bit
in BDS 5.1.
2) The LATITUDE (fine) and LONGITUDE (fine) parameters
are in 2's complement coding so they shall be interpreted in
conjunction with the corresponding parameters in BDS 5,1.
Note.- When GNSS height is contained in bits 42 to 56, the
pressure altitude can be obtained from BDS 5,l.
Annex I0 - Aeronautical Telecommunications Volume 111
Table 2-83. BDS code 5,3 - Air-referenced state vector
MB FIELD
STATU s PURPOSE: To provide the ATC system with the current
SlGN measured values of magnetic heading IASIMach, altitude rate
MSB = 90 degrees and TAS.
MAGNETIC HEADING
Range = [-180, +I 801
LSB = 901512 degrees
STATUS
MSB = 512 kt
INDICATED AIRSPEED (IAS)
Range = [0, 1 0241
LSB = 1 kt
STATUS
MSB = Mach 2.048
MACH NUMBER
Range = [o, 4.0961
LSB = Mach 0.008
STATUS
MSB = 1 024 kt
TRUE AIRSPEED (TAS)
Range = [0, 2 0481
LSB = 0,5 kt
STATUS
SlGN
MSB = 8 192 Wmin
ALTITUDE RATE
Range = [-I 6 384, +16 3841
LSB = 64 Wrnin
28/11/02
No. 77
I'urt 1 A~tnex1 0 - Aeronautical Telecommr~nications
Table 2-84 to 2-86. BDS codes 5,4 to 5,6 - Waypoints 1, 2 and 3
PURPOSE: To provide information on the next three waypoints.
BDS 5,4 contains details of the next waypoint, BDS 5,5
contains details of the next waypoint plus 1, and BDS 5,6
3 contains details of the next waypoint plus 2.
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2 1
22
23
24 -
25
26
27
28
29
30
31
-32-
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
1) The single status bit (bit 1) shall be set to 0 if any of the
parameters are invalid.
~ F S (see I) ----.
CHARACTER 1
LSB
MSB
CHARACTER2
LSB
MSB
CHARACTER3
LSB
MSB
CHARACTER 4
LSB
MSB
CHARACTER5
LSB
MSB = 30 min
ESTIMATED TIME OF ARRIVAL
(NORMAL FLIGHT)
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