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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
Message Block CRC 32 — — — 0101 0111 0000 0011 1111 1110 1001 1011
APPLICATION FEC 48 — — — 0001 1011 1001 0001 0010 1010 1011 1100 0010 0101 1000 0101
Input to the bit scrambling
(Note 2)
1 82 30 00 55 05 4B 30 20 3A 94 0F F0 40 60 30 F2 98 C0 C8 40 28 E0 61 47 5D 48 09 7B C9 00 AD D8 33 3C BF 34 07 40 AA
81 34 80 26 00 B2 15 A5 45 26 13 94 08 F0 40 60 30 86 90 A8 04 70 28 E0 3D 83 ED 48 38 C5 E9 00 4B D8 DF 46 40 3C 21 BF
8C 81 B4 80 26 00 EB 05 B2 F5 26 13 D9 7F C0 EA A1 A4 3D 54 89 D8
Output from the bit scrambling
(Note 3)
1 A4 07 88 1F 1A 53 1B FF A0 41 D6 C2 9C 26 E0 04 59 89 CB 5C 2C CF 91 2D E2 2E 5D F3 07 1E 45 F1 53 5F C0 4F 53 E4
64 F0 23 C3 ED 05 A9 E6 7F FF FF B5 49 81 DD A3 F2 B5 40 9D A0 17 90 12 60 64 7C CF E3 BE A0 1E 72 FF 61 6E E4 02 44
D9 1E D2 FD 63 D1 12 C3 5A 00 0E F8 89 FE 4C 12 0C 78 4F 9D 55 08 16 F6
Fill bits 0 to 2 — — 1 0
Power ramp down 9 — — — 000 000 000
D8PSK Symbols
(Note 4)
0000003511204546316504322300771662170713052556673176724345377776157763461661570543615214576405133401677
5214231304443061301150266774341755603276241630527536540015247051420322575333462555437707605652760631444
6243163101353722250120760407526435103457714077770415665273600122324007402031443362754444
Notes.—
1. The rightmost bit is the LSB of the binary parameter value and is the first bit transmitted or sent to the bit scrambler. All data fields are sent in the order
specified in 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-40
Attachment D Annex 10 — Aeronautical Communications
Table D-10. Example of a Type 5 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 0100 0111 1101 1111 1000 1100 0111 0110 0000 0111 1001 0000
SCRAMBLED DATA
Station slot identifier (SSID) 3 — — D 01 1
Transmission length (bits) 17 0 to 1 824 bits 1 bit 272 000 0000 0100 0100 00
Training sequence FEC 5 — — — 0001 1
APPLICATION DATA MESSAGE BLOCK
Message Block (Type 5 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 5 0000 0101
Message length 8 10 to 222 bytes 1 byte 28 0001 1100
Message (Type 5 example)
Modified Z-count 14 0 to 1 199.9 s 0.1 s 100 s 00 0011 1110 1000
Spare 2 — — — 00
Number of impacted sources (N) 8 0 to 31 1 2 0000 0010
First impacted source
Ranging source ID 8 1 to 255 1 4 0000 0100
Source availability sense 1 — — Will cease 0
Source availability duration 7 0 to 1 270 s 10 s 50 s 0000 101
Second impacted source
Ranging source ID 8 1 to 255 1 3 0000 0011
Source availability sense 1 — — Will start 1
Source availability duration 7 0 to 1 270 s 10 s 200 s 0010 100
Number of obstructed approaches (A) 8 0 to 255 1 2 0000 0010
First obstructed approach
Reference path data selector (RPDS) 8 0 to 48 1 21 0001 0101
Number of impacted sources for first
obstructed approach (NA)
8 1 to 31 1 2 0000 0010
First impacted ranging source of
first obstructed approach
Ranging source ID 8 1 to 255 1 12 0000 1100
Source availability sense 1 — — Will cease 0
Source availability duration 7 0 to 1 270 s 10 s 250 s 0011 001
Second impacted ranging source of
first obstructed approach
Ranging source ID 8 1 to 255 1 14 0000 1110
Source availability sense 1 — — Will cease 0
Source availability duration 7 0 to 1 270 s 10 s 1 000 s 1100 100
Second obstructed approach
Reference path data selector (RPDS) 8 0 to 48 1 14 0000 1110
Number of impacted sources for
second obstructed approach (NA)
8 1 to 31 1 1 0000 0001
ATT D-41 23/11/06
Annex 10 — Aeronautical Communications Volume I
DATA CONTENT DESCRIPTION
BITS
USED
RANGE OF
VALUES RESOLUTION VALUES
BINARY REPRESENTATION
(NOTE 1)
First impacted ranging source of
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