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the table.
2. This field is coded in hexadecimal with the first bit to be sent to the bit scrambler as its MSB. The first character represents a single bit.
3. In this example, fill bits are not scrambled.
4. This field represents the phase, in units of π/4 (e.g. a value of 5 represents a phase of 5π/4 radians), relative to the phase of the first symbol.
23/11/06 ATT D-38
Attachment D Annex 10 — Aeronautical Communications
Table D-9. Example of a Type 4 message
DATA CONTENT DESCRIPTION
BITS
USED
RANGE OF
VALUES RESOLUTION VALUES
BINARY REPRESENTATION
(NOTE 1)
BURST DATA CONTENT
Power ramp-up and settling 15 000 0000 0000 0000
Synchronization and ambiguity
resolution
48 010 0011 1110 1111 1100 0110 0011 1011 0000 0011 1100 1000 0
SCRAMBLED DATA
Station slot identifier (SSID) 3 — — D 01 1
Transmission length (bits) 17 0 to 1 824 bits 1 bit 784 000 0000 1100 0100 00
Training sequence FEC 5 — — — 0000 0
APPLICATION DATA MESSAGE BLOCK
Message Block (Type 4 message)
Message Block Header
Message block identifier 8 — — Normal 1010 1010
GBAS ID 24 — — CMJ 0000 1100 1101 0010 1010 0000
Message type identifier 8 1 to 8 1 4 0000 0100
Message length 8 10 to 222 bytes 1 byte 92 0101 1100
Message (Type 4 example)
FAS Data Set 1
Data set length 8 2 to 212 1 byte 41 0010 1001
FAS Data Block 1
Operation type 4 0 to 15 1 0 0000
SBAS service provider 4 0 to 15 1 15 1111
Airport ID 32 — — LFBO 0000 1100 0000 0110 0000 0010 0000 1111
Runway number 6 0 to 36 1 15 00 1111
Runway letter 2 — — R 01
Approach performance designator 3 0 to 7 1 CAT 1 001
Route indicator 5 — — C 0001 1
Reference path data selector (RPDS) 8 0 to 48 1 3 0000 0011
Reference path identifier 32 — — GTBS 0000 0111 0001 0100 0000 0010 0001 0011
LTP/FTP latitude 32 ±90.0° 0.0005 arcsec 43.6441075°N 0001 0010 1011 1010 1110 0010 1000 0110
LTP/FTP longitude 32 ±180.0° 0.0005 arcsec 1.345940°E 0000 0000 1001 0011 1101 1110 1001 0000
LTP/FTP height 16 –512.0 to
6 041.5 m
0.1 m 197.3 0001 1011 1011 0101
ΔFPAP latitude 24 ±1° 0.0005 arcsec –0.025145° 1111 1101 0011 1100 1100 1100
ΔFPAP longitude 24 ±1° 0.0005 arcsec 0.026175° 0000 0010 1110 0000 0010 1100
Approach threshold crossing
height (TCH)
15 0 to 1 638.35 m
(0 to 3 276.7 ft)
0.05 m
(0.1 ft)
17.05 m 000 0001 0101 0101
Approach TCH units selector 1 0 = ft; 1 = m — metres 1
Glide path angle (GPA) 16 0 to 90° 0.01° 3° 0000 0001 0010 1100
Course width 8 80.0 to 143.75 m 0.25 m 105 0110 0100
ΔLength offset 8 0 to 2 032 m 8 m 0 0000 0000
FAS Data Block 1 CRC 32 — — — 1010 0010 1010 0101 1010 1000 0100 1101
FASVAL/Approach status 8 0 to 25.4 0.1 m 10 0110 0100
FASLAL/Approach status 8 0 to 50.8 0.2 m 40 1100 1000
FAS Data Set 2
Data set length 8 2 to 212 1 byte 41 0010 1001
ATT D-39 23/11/06
Annex 10 — Aeronautical Communications Volume I
FAS Data Block 2
Operation type 4 0 to 15 1 0 0000
SBAS service provider 4 0 to 15 1 01 0001
Airport ID 32 — — LFBO 0000 1100 0000 0110 0000 0010 0000 1111
Runway number 6 0 to 36 1 33 10 0001
Runway letter 2 — — R 01
Approach performance designator 3 0 to 7 1 CAT 1 001
Route indicator 5 — — A 0000 1
Reference path data selector (RPDS) 8 0 to 48 1 21 0001 0101
Reference path identifier 32 — — GTN 0000 0111 0001 0100 0000 1110 0010 0000
LTP/FTP latitude 32 ±90.0° 0.0005 arcsec 43.6156350°N 0001 0010 1011 0111 1100 0001 1011 1100
LTP/FTP longitude 32 ±180.0° 0.0005 arcsec 1.3802350°E 0000 0000 1001 0111 1010 0011 0001 1100
LTP/FTP height 16 –512.0 to
6 041.5 m
0.1 m 200.2 m 0001 1011 1101 0010
ΔFPAP latitude 24 ±1° 0.0005 arcsec 0.02172375° 0000 0010 0110 0010 1111 1011
ΔFPAP longitude 24 ±1° 0.0005 arcsec –0.0226050° 1111 1101 1000 0100 0011 1100
Approach threshold crossing
height (TCH)
15 0 to 1 638.35 m
(0 to 3 276.7 ft)
0.05 m
(0.1 ft)
15.25 m 000 0001 0011 0001
Approach TCH units selector 1 0 = ft; 1 = m — metres 1
Glide path angle (GPA) 16 0 to 90° 0.01° 3.01° 0000 0001 0010 1101
Course width 8 80.0 to 143.75 m 0.25 m 105 0110 0100
ΔLength offset 8 0 to 2 032 m 8 m 0 0000 0000
FAS data block 2 CRC 32 — — — 1010 1111 0100 1101 1010 0000 1101 0111
　
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