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Note.— All parameters are broadcast in Type 17 mes
3 4 SATELLITE CORRECTION BROADCAST PARAMETERS
3.5.4.4.1 Long-term correction parameters shall be as follows:
Is e of data (IOD ): an indicator that associates the long-term corrections for the ith satellite with the ephem
broadcast by that satellite.
23/11/06 APP B-38
Appendix B Annex 10 — Aeronautical Communications
Note 1.— For GPS, the IODi matches the IODE and 8 LSBs of the IODC (3.1.1.3.1.4 and 3.1.1.3.2.2).
d of time that GLONASS data are to be used with SBAS data. It
onsists of two fields as shown in Table B-28.
xi: for satellite i, the ephemeris correction for the x axis.
: for satellite i, the ephem
ai,f0: for satellite i, the ephemeris time correction.
Note 2.— For GLONASS, the IODi indicates a perio
c
δ
δyi eris correction for the y axis.
δzi: for satellite i, the ephemeris correction for the z axis.
δ
δx􀀅i : for satellite i, ephemeris velocity correction for x axis.
ai,f1 of change of the ephemeris time correction.
i i i i,f0
δy􀀅i : for satellite i, ephemeris velocity correction for y axis.
δz􀀅i : for satellite i, ephemeris velocity correction for z axis.
δ : for satellite i, rate
ti,LT: the time of applicability of the parameters δx , δy , δz , δa , δx􀀅 i , δy􀀅 i , δz􀀅i and δai,f1, expressed in seconds after
t e
in or adcast (Table B-48 and Table B-49).
od
1 and δai,f1 are broadcast.
Note.— All parameters are broadcast in Type 24 and 25 messages.
Table B-27. SBAS service provider
Ide er Ser er
midnight of he curr nt day.
Velocity code: an dicat of the message format bro
C ing: 0 = δx􀀅 i , δy􀀅 i , δz􀀅i and δai,f1 are not broadcast.
= δx􀀅 i , δy􀀅 i , δz􀀅i
identifiers
ntifi vice provid
0
1 EGN
WAAS
OS
2 MSAS
3 to 13 Spare
14, 15 Reserved
Table B-28. IODi for GLONASS satellites
MSB LSB
Validity interval (5 bits) Latency time (3 bits)
APP B-39 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.5.4.4.2 Fast correction parameters shall be as follows:
ast correction (FC ): for satellite i, the pseudo-range correction for rapidly varying errors, other than tropospheric or
Note.— The user receiver applies separate tropospheric corrections (3.5.8.4.2 and 3.5.8.4.3).
Fas contains the fast correction and
integrity data associated with the PRN mask numbers from Type 2, Type 3, Type 4 or Type 5 messages, respectively.
corrections. The index j shall denote the
message type (j = 2 to 5) to which IODF applies (the fast correction type identifier +2).
The fast correction type identifier is broadcast in Type 24 messages. The FCi are broadcast in Type 2 to 5, and
ype 24 messages. The IODF are broadcast in Type 2 to 6, and Type 24 messages.
3.5.4.5 Fast and long-term correction integrity parameters. Fast and long-term correction integrity parameters shall be
UD
normal distribution associated with the
user differential range errors for satellite i after application of fast and long-term corrections, excluding atmospheric
P mask: a set of 11 ionospheric grid point (IGP) band masks defined in Table B-30.
IGP band mask: a set of IGP mask values which correspon all IGP locations in one of the 11 IGP bands defined in
Table B-30.
Table B-29. Evaluatio Ii
UDREIi
F i
ionospheric errors, to be added to the pseudo-range after application of the long-term correction.
t correction type identifier: an indicator (0, 1, 2, 3) of whether the Type 24 message
Issue of data-fast correction (IODFj): an indicator that associates UDREIis with fast
j
Note.—
T j
as follows:
REIi: an indicator that defines the σ2
i,UDRE for satellite i as described in Table B-29.
Model variance of residual clock and ephemeris errors (σ2
i,UDRE): the variance of a
effects and used in horizontal protection level/vertical protection level computations (3.5.5.6).
Note.— All parameters are broadcast in Type 2 to 6, and Type 24 messages.
3.5.4.6 Ionospheric correction parameters. Ionospheric correction parameters shall be as follows:
IG
d to
n of UDRE
σ2
i,UDRE
0 0.0520 m2
1 0.0924 m2
2 0.1444 m2
3 0.2830 m2
4 0.4678 m2
5 0.8315 m2
6 1.2992 m2
7 1.8709 m2
8 2.5465 m2
9 3.3260 m2
10 5.1968 m2
11 20.7870 m2
　
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