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17 GEO sa
18 Ionospheric grid point masks
to 2 Spare
24 Mixed fast/long-term satellite er
25 Long-term satellite error
26 Ionospheric delay corrections
27 SBAS
28 Clock-ephe
to 6 Spare
3.5.3.5.3 The CRC information field, M(x), shall be:
eld 1
it of the preamble, and m226 corresponds to bit 212 of the data field.
3.5.3.5.5 The CRC code r-bits shall be order bit transmitted and r24 is the last bit transmitted.
RN that uniquely identifies the satellite PRN code and related assignments as shown in Table B-25.
ask shall set up to 51 of the
210 PRN mask values.
Note.— The first transmitted bit o orresponds to PR er 1.
226
226 i 225 224 0
i 1 2 226
i 1
M(x) m x − m x m x m x
=
=Σ = + +…+
3.5.3.5.4 M(x) shall be formed from the 8-bit SBAS message preamble, 6-bit message type identifier, and 212-bit data
fi . Bits shall be arranged in the order transmitted from the SBAS satellite, such that m corresponds to the first transmitted
b
ed such that r1 is the first
3.5.4 DATA CONTENT
3.5.4.1 PRN mask parameters. PRN mask parameters shall be as follows:
P code number: a number
PRN mask: 210 PRN mask values that correspond to satellite PRN code numbers. The m
f the PRN mask c N code numb
23/11/06 APP B-36
Appendix B Annex 10 — Aeronautical Communications
Table B-25. PRN code number assignments
PR er
N code numb Assignment
1 – 37
38 – 61
GPS
GLONASS slot number plus 37
62 – 119 Spare
120 – 138 SBAS
139 – 210 Spare
PRN mask value: a bit in the PRN mask
(1 to 210).
indicating whether data are provided for the associated satellite PRN code number
RN number for which the PRN mask value is “1”.
data a PRN mask.
ot
es) in Type 1 message;
s;
3.5.4.2 ing function parameters. GEO ranging function parameters shall be as follows:
Coding: 0 = data not provided
1 = data provided
PRN mask number: the sequence number (1 to 51) of the mask values set in the PRN mask.
Note.— The PRN mask number is “1” for the lowest satellite P
Issue of — PRN (IODP): an indicator that associates the correction data with
N e.— Parameters are broadcast in the following messages:
a) PRN mask (consisting of 210 PRN mask valu
b) PRN mask number in Type 24, 25 and 28 message
c) PRN code number in Type 17 message; and
d) IODP in Type 1 to 5, 7, 24, 25 and 28 messages.
Geostationary orbit (GEO) rang
t0,GEO: the reference time for the GEO ranging function data, expressed as the time after midnight of the current day.
[ ] XGYGZG : the position of the GEO at time t .
0,GEO
⎡⎣ G G G⎤⎦ X􀀅 Y􀀅 Z􀀅 : the velocity of the GEO at time t0,GEO.
⎡⎣􀀅􀀅 􀀅􀀅 􀀅􀀅 ⎤⎦ XGYGZG : the acceleration of the GEO at time t0,GEO.
aGf0: the time offset of the GEO clock with respect to SNT, defined at t0,GEO.
aGf1:
User range accuracy (URA): an indicator of cluding atmospheric effects, as described in
Table B-26.
Note.— All parameters are broadcast in Type message.
the drift rate of the GEO clock with respect to SNT.
the root-mean-square ranging error, ex
9
APP B-37 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table B-26. User ran
U Accu ms)
ge accuracy
RA racy (r
0 2 m
1 2.8 m
2 4 m
3 5.7 m
4 8 m
5 11.3 m
6 16 m
7 32 m
8 64 m
9 128 m
10 256 m
11 512 m
12 1 024 m
13 2 048 m
14 4 096 m
15 “Do Not Use”
3.5.4.3 GEO almanac parameters. GEO almanac parameters shall be as follows:
ealth and status: an indication of the functions provided by the SBAS. The service provider identifiers are shown in
e B
oding: LSB)
on corrections n (0) ff (1)
rrections n (0) ff (1)
Bits 3 Spare
sed for GBAS and is not applicable to SBAS.
⎤⎦
PRN code number: see 3.5.4.1.
H
Tabl -27.
C Bit 0 ( Ranging On (0) Off (1)
Bit 1 Precisi O O
Bit 2 Satellite status and basic co O O
Bits 4 to 7 Service provider identifier
Note.— A service provider ID of 14 is u
: the position of the GEO at time talmanac. ⎡⎣
XG,AYG,AZG,A
⎡⎣ 􀀅 􀀅 ⎤⎦
: the reference time for the GEO almanac data, expressed as the time after midnight of the current day.
sage.
.5.4.
su i eris data
􀀅 XG,AYG,AZG,A : the velocity of the GEO at time talmanac.
　
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