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character is coded using bits b1 through b6 of its Internatio
digits and IA-5 “space” are used. The rightmost character is transmitted first. For a three-character GBAS ID, the
rightmost (first transmitted) character shall be IA-5 “space”.
Note.— The GBAS ID is normally identical to the location indicator at the
b
M
M
check (CRC)
lyn shall be:
32 + x24 + x22 + x16 + x14 + x8 + x7 + x5 + x3 + x +
fie ), shall be:
(x)
n
i 1 =
Σ i 1 2
ed from e 48-bit GBAS message block hea
shall be arra ed in th
n
3.6.3.4 The CRC shall be orde
Note.— Currently only 9 of the 256 available message types have been defined, with the intent that future needs can be
a d in the remaining message types.
3.6.4.2 TYPE 1 MESSAGE — PSEUDO-RANGE CORRECTIONS
3.6.4.2.1 The Type 1 message shall provide
(Table B-70). The message shall contain three sections:
a) message information (time of validity, additional message flag, number of measurements and the measurement
type);
23/11/06 APP B-82
Appendix B Annex 10 — Aeronautical Communications
c) satellite data measurement blocks.
Note.— Transmission of the low-frequency data for SBAS ranging sources is optional.
3.6.4.2.2 Each Type 1 message shall include ephemeris decorrelation parameter, ephemeris CRC and source
availability duration parameters for one satellite ranging source. The ephemeris decorrelation parameter, ephemeris CRC and
source availability duration shall apply to the first ranging source in the message.
3.6.4.2.3 Pseudo-range correction parameters shall be as follows:
Coding: the modified Z-count resets on the hour (xx:00), 20 minutes past the hour (xx:20) and 40 minutes past the hour
(xx:40) referenced to GPS time.
Additional message flag: an identification of whether the set of measurement blocks in a single frame for a particular
measurement type is contained in a single Type 1 message or a linked pair of messages.
Coding: 0 = All measurement blocks for a particular measurement type are contained in one Type 1 message.
1 = This is the first transmitted message of a linked pair of Type 1 messages that together contain the set of all
measurement blocks for a particular measurement type.
. asurements
nd low-fr
um age.
Ta at as
s
d e
Modified Z-count: the indication of the time of applicability for all the parameters in the message.
2 = Spare
3 = This is the second transmitted message of a linked pair of Type 1 messages that together contain the set of all
measurement blocks for a particular measurement type.
Note — When a linked pair of Type 1 messages is used for a particular measurement type, the number of me
a equency data are computed separately for each of the two individual messages.
N ber of measurements: the number of measurement blocks in the mess
Measurement type: the type of ranging signal from which the corrections have been computed.
ble B-63. GBAS VHF d a broadc t messages
Me sage type
i entifier Message nam
0 Spar
s or
B dat
e rou ranging source
4 Fi s
5 Pr in ai
6 Rese
e ati icat
e st ns
p
R ra ti
2 p
Note.— See 3.6.6 for message formats.
e
1 P eudo-range c rections
2 G AS-related a
3 R served for g nd-based
nal approach
edicted rang
egment (FAS
g source av
) data
lability
rved
7 R
8 R
served for n onal appl ions
served for te
are
applicatio
9 to 100 S
101 G
to 255 S
AS pseudoare
nge correc ons
10
APP B-83 23/11/06
Annex 10 — Aeronautical Communications Volume I
Coding: 0 = C/A or CSA code L1
1 = reserved
2 = reserved
3 = reserved
4 to 7 = spare
Ephemeris decorrelati idual ephemeris errors due to
decorrelation for th
For a SBAS geostation l be coded as all zeros.
For GBAS ground su hat do not broadcast the additional data block 1 in the Type 2 message, the ephemeris
decorrelation paramete
Ephemeris CRC: the CRC computed with the ephemeris data used to determine corrections for the first measurement block in
the message. The all be calculated in accordance
with 3.9. The leng nerator polynomial shall be:
G(x) = x16 + x12 + x5 + 1
ion ite shall be:
+ . . . + mnx0
th n = 576 bits. M(x) for a GPS satellite shall be calculated using the first 24 bits
om each of words 3 to S10 of subframes 1, 2 and 3 of the data transmission from that satellite, ANDed with the GPS
satellite ephemeris mask of Table B-64. M(x) shall be arranged in the order that bytes are transmitted by the GPS satellite,
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