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Additional message flag 2 0 to 3 1 1st of pair 01
Number of measurements 5 0 to 18 1 4 0 0100
Measurement type 3 0 to 7 1 C/A L1 000
Ephemeris Decorrelation
Parameter (P)
8 0 to 1.275
× 10–3m/m
5 × 10–6m/m
0.115 ×
10–3m/m
0001 0111
Ephemeris CRC 16 0 0000 0000 0000 0000
Source availability duration 8 0 to 2540 s 10 s Not provided 1111 1111
Number of B parameters 1 0 to 1 1 0 0
Spare 7 0 000 0000
Measurement Block 1
Ranging source ID 8 1 to 255 1 2 0000 0010
Issue of data (IOD) 8 0 to 255 1 255 1111 1111
Pseudo-range correction (PRC) 16 ±327.67 m 0.01 m +3.56 m 0000 0001 0110 0100
Range rate correction (RRC) 16 ±32.767 m/s 0.001 m/s -0.011 m/s 1111 1111 1111 0101
σpr_gnd 8 0 to 50.8 m 0.2 m 9.8 m 0011 0001
Measurement Block 2
Ranging source ID 8 1 to 255 1 4 0000 0100
Issue of data (IOD) 8 0 to 255 1 126 0111 1110
Pseudo-range correction (PRC) 16 ±327.67 m 0.01 m -1.0 m 1111 1111 1001 1100
Range rate correction (RRC) 16 ±32.767 m/s 0.001 m/s +0.002 m/s 0000 0000 0000 0010
σpr_gnd 8 0 to 50.8 m 0.2 m 3.4 m 0001 0001
Measurement Block 3
Ranging source ID 8 1 to 255 1 12 0000 1100
Issue of data (IOD) 8 0 to 255 1 222 1101 1110
Pseudo-range correction (PRC) 16 ±327.67 m 0.01 m +4.11 m 0000 0001 1001 1011
Range rate correction (RRC) 16 ±32.767 m/s 0.001 m/s -0.029 m/s 1111 1111 1110 0011
σpr_gnd 8 0 to 50.8 m 0.2 m 10.2 m 0011 0011
ATT D-33 23/11/06
Annex 10 — Aeronautical Communications Volume I
DATA CONTENT DESCRIPTION
BITS
USED
RANGE OF
VALUES RESOLUTION VALUES
BINARY REPRESENTATION
(NOTE 1)
Measurement Block 4
Ranging source ID 8 1 to 255 1 23 0001 0111
Issue of data (IOD) 8 0 to 255 1 80 0101 0000
Pseudo-range correction (PRC) 16 ±327.67 m 0.01 m -2.41 m 1111 1111 0000 1111
Range rate correction (RRC) 16 ±32.767 m/s 0.001 m/s -0.096 m/s 1111 1111 1010 0000
σpr_gnd 8 0 to 50.8 m 0.2 m 1.6 m 0000 1000
Message Block CRC 32 1000 1000 1001 1111 0111 1000 0000 0100
APPLICATION FEC 48 1100 1100 1110 0110 1111 0110 1100 1110 1101 0110 0110 0010
Input to the bit scrambling
(Note 2)
0 41 60 1B 55 73 A4 A8 A6 74 17 C2 20 E8 00 00 FF 00 40 FF 26 80 AF FF 8C 20 7E 39 FF 40 00 88 30 7B D9 80 C7 FF CC E8
0A F0 FF 05 FF 10 20 1E F9 11 46 6B 73 6F 67 33
Output from the bit scrambling
(Note 3)
0 67 57 93 1F 6C BC 83 79 EE C2 1B 12 34 46 D0 09 C1 09 FC 3A 84 80 0F E6 9F 18 6D 77 8E 1E 60 19 1B BA FF BC AB 68
26 7B E7 BC CE FA 0B D3 C4 43 C8 E0 B6 FA 42 84 A1
Fill bits 0 to 2 0
Power ramp-down 9 000 000 000
D8PSK Symbols
(Note 4)
00000035 11204546 31650105 06345463 57026113 51374661 15123376 12066670 44776307 04225000 02735027 73373152
13230100 04706272 74137202 47724524 12715704 15442724 01101677 44571303 66447212 222
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-34
Attachment D Annex 10 — Aeronautical Communications
Table D-8. Example of Type 1 and Type 2 VDB messages in a single burst
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 — — E 10 0
Transmission length (bits) 17 0 to 1 824 bits 1 bit 544 000 0000 1000 1000 00
Training sequence FEC 5 — — — 0000 0
APPLICATION DATA
Message Block 1 (Type 1 message)
Message Block Header
Message block identifier 8 — — Normal 1010 1010
GBAS ID 24 — — BELL 0000 1000 0101 0011 0000 1100
Message type identifier 8 1 to 8 1 1 0000 0001
Message length 8 10 to 222 bytes 1 byte 28 0001 1100
Message (Type 1 example)
Modified Z-count 14 0 to 1 199.9 s 0.1 s 100 s 00 0011 1110 1000
Additional message flag 2 0 to 3 1 2nd of pair 11
Number of measurements 5 0 to 18 1 1 0 0001
Measurement type 3 0 to 7 1 C/A L1 000
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