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Ephemeris Decorrelation
Parameter (P) 8
0 to 1.275 ×
10–3 m/m 5 × 10–6 m/m 0 (SBAS) 0000 0000
Ephemeris CRC 16 — — 0 0000 0000 0000 0000
Source availability duration 8 0 to 2 540 s 10 s Not provided 1111 1111
Measurement Block 1
Ranging source ID 8 1 to 255 1 122 0111 1010
Issue of data (IOD) 8 0 to 255 1 2 0000 0010
Pseudo-range correction (PRC) 16 ±327.67 m 0.01 m +1.0 m 0000 0000 0110 0100
Range rate correction (RRC) 16 ±32.767 m 0.001 m/s –0.2 m/s 1111 1111 0011 1000
σpr_gnd 8 0 to 5.08 m 0.02 m 1.96 m 0110 0010
B1 8 ±6.35 m 0.05 m +0.10 m 0000 0010
B2 8 ±6.35 m 0.05 m +0.15 m 0000 0011
B3 8 ±6.35 m 0.05 m –0.25 m 1111 1011
B4 8 ±6.35 m 0.05 m Not used 1000 0000
Message Block 1 CRC 32 — — — 1011 0101 1101 0000 1011 1100 0101 0010
Message Block 2 (Type 2 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 2 0000 0010
Message length 8 10 to 222 bytes 1 byte 34 0010 0010
Message (Type 2 example)
GBAS reference receivers 2 2 to 4 1 3 01
Ground accuracy designator letter 2 — — B 01
Spare 1 — — 0 0
ATT D-35 23/11/06
Annex 10 — Aeronautical Communications Volume I
DATA CONTENT DESCRIPTION
BITS
USED
RANGE OF
VALUES RESOLUTION VALUES
BINARY REPRESENTATION
(NOTE 1)
GBAS continuity/integrity designator 3 0 to 7 1 1 001
Local magnetic variation 11 ±180° 0.25° 58° E 000 1110 1000
Spare 5 — — 0 0000 0
σvert_iono_gradient 8
0 to 25.5 ×
10–6 m/m
0.1 ×
10–6 m/m 0 0000 0000
Refractivity index 8 16 to 781 3 379 1111 1001
Scale height 8 0 to 25 500 m 100 m 100 m 0000 0001
Refractivity uncertainty 8 0 to 255 1 20 0001 0100
Latitude 32 ±90.0° 0.0005 arcsec 45°40’32’’ N 0001 0011 1001 1010 0001 0001 0000 0000
Longitude 32 ±180.0° 0.0005 arcsec 93°25’13’’W 1101 0111 1110 1000 1000 1010 1011 0000
Ellipsoid height 24 ±83 886.07 m 0.01 m 892.55 m 0000 0001 0101 1100 1010 0111
Additional Data Block 1
Reference Station Data Selector 8 0 to 48 1 5 0000 0101
Maximum Use Distance (Dmax) 8 2 to 510 km 2 km 50 km 0001 1001
Kmd_e_POS,GPS 8 0 to 12.75 0.05 6 0111 1000
Kmd_e,GPS 8 0 to 12.75 0.05 5 0110 0100
Kmd_e_POS,GLONASS 8 0 to 12.75 0.05 0 0000 0000
Kmd_e,GLONASS 8 0 to 12.75 0.05 0 0000 0000
Message Block 2 CRC 32 — — — 0101 1101 0111 0110 0010 0011 0001 1110
Application FEC 48 1110 1000 0100 0101 0011 1011 0011 1011 0100 0001 0101 0010
Input to the bit scrambling
(Note 2)
0 41 10 00 55 30 CA 10 80 38 17 C3 80 00 00 00 FF 5E 40 26 00 1C FF 46 40 C0 DF 01 4A 3D 0B AD 55 30 CA 10 40 44 A4 17
00 00 9F 80 28 00 88 59 C8 0D 51 17 EB E5 3A 80 A0 98 1E 26 00 00 78 C4 6E BA 4A 82 DC DC A2 17
Output from the bit scrambling
(Note 3)
0 67 27 88 1F 2F D2 3B 5F A2 C2 1A B2 DC 46 D0 09 9F 09 25 1C 18 D0 B6 2A 7F B9 55 C2 F3 15 45 7C 50 A9 6F 3B 10 00
D9 71 17 DC 4B 2D 1B 7B 83 72 D4 F7 CA 62 C8 D9 12 25 5E 13 2E 13 E0 42 44 37 45 68 29 5A B9 55 65
Fill bits 0 to 2 — — 1 0
Power ramp-down 9 — — — 000 000 000
D8PSK Symbols
(Note 4)
00000035 11204546 31650105 67443352 35201160 30501336 62023576 12066670 74007653 30010255 31031274 26172772
76236442 41177201 35131033 33421734 42751235 60342057 66270254 17431214 03421036 70316613 46567433 66547730
34732201 40607506 014444
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 5 π/4 radians), relative to the phase of the first symbol.
23/11/06 ATT D-36
Attachment D Annex 10 — Aeronautical Communications
Table D-8A. Example of Type 1 and Type 2 VDB messages with additional data blocks 1 and 2
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
　
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