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SCRAMBLED DATA
Station slot identifier (SSID) 3 E 100
Transmission length (bits) 17 0 to 1824 bits 1 bit 592 00000001001010000
Training sequence FEC 5 10110
APPLICATION DATA
Message Block 1 (Type 1 message)
Message Block Header
Message block identifier 8 Normal 1010 1010
GBAS ID 24 ERWN 00010101 00100101 11001110
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 1199.9 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
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 2540 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 +2.09 m 0000 0000 1101 0001
Range rate correction (RRC) 16 ±32.767 m/s 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 00110010 10100100 11001011 00110000
Message Block 2 (Type 2 message)
Message Block Header
Message block identifier 8 Normal 1010 1010
GBAS ID 24 ERWN 00010101 00100101 11001110
Message type identifier 8 1 to 8 1 2 0000 0010
Message length 8 10 to 222 bytes 1 byte 40 0010 1000
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-37 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 × 10-6m/m 0.1 × 10-6m/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
Additional Data Blocks
Additional Data Block Length 8 2 to 255 1 6 0000 0110
Additional Data Block Number 8 2 to 255 1 2 0000 0010
Additional Data Block 2
Channel Number 16 20001 to 39999 1 25001 0110 0001 1010 1001
ΔLatitude 8 ±25.4° 0.2° 5.2 0001 1010
ΔLongitude 8 ±25.4° 0.2° –3.4 1110 1111
Message Block 2 CRC 32 11100000 01110010 00011101 00100100
Application FEC 48 1110 0010 0101 1100 0000 1111 1010 1011 0011 0100 0100 0000
Input to the bit scrambling
(Note 2)
0 42 90 0D 55 73 A4 A8 80 38 17 C3 80 00 00 00 FF 5E 40 8B 00 1C FF 46 40 C0 DF 01 0C D3 25 4C 55 73 A4 A8 40
14 A4 17 00 00 9F 80 28 00 88 59 C8 0D 51 17 EB E5 3A 80 A0 98 1E 26 00 00 60 40 95 86 58 F7 24 B8 4E 07 02 2C
D5 F0 3A 47
Output from the bit scrambling
(Note 3)
0 64 A7 85 1F 6C BC 83 5F A2 C2 1A B2 DC 46 D0 09 9F 09 88 1C 18 D0 B6 2A 7F B9 55 84 1D 3B A4 7C 13 C7 D7
3B 40 00 D9 71 17 DC 4B 2D 1B 7B 83 72 D4 F7 CA 62 C8 D9 12 25 5E 13 2E 13 E0 5A C0 CC 79 7A 5C A2 DD B9 75
B6 95 64 52 78 3F
Fill bits 0 to 2 1 0
Power ramp-down 9 000 000 000
D8PSK Symbols
(Note 4)
00000035 11204546 31650107 56336574 60137224 74145772 26467132 56422234 30443700 05565722 06506741
73647332 27242654 63345227 31575333 33421734 42751235 60342057 66270254 17431214 03421036 70316613
46567433 62077121 37275607 55315167 17135031 34423411 274444
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
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