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t rates. For all message types required to be broadcast, messages meeting the field strength
quirements of Chapter 3, 3.7.3.5.4.4.1.2 and 3.7.3.5.4.4.2.2 and the minimum rates shown in Table B-76 shall be provided
age broadcast rates from all antenna systems of the ground subsystem
n in Table B-76.
e coding given in
.6.3
cy. The time between the time indicated by the modified Z-count and the last bit of the
essage shall not exceed 0.5 seconds.
Table B-76. GBAS VHF data broadcast rates
Maximum broadcast rate
3.6.7.2.1.1.2 Each GBAS ground subsystem shall broadcast Type 2 messages.
precision approaches supported by that GBAS ground subsystem. If a GBAS ground subsystem supports APV and does not
broadcast FAS blocks for the corresponding approaches, it shal
Note.— FAS blocks for APV procedures may be held within a database on board the aircraft. Broadcasting additional
data block 1 allows the airborne receiver to select the GBAS ground subsystem that supports the approach procedures in the
airbor
procedures use different channel numbers as described in Attachm
3.6 7.2.1.1.4 When the Type 5 message is used, the ground subsystem shall broadc
a rda ce with Table B-76.
Note.— When the standard 5 degree mask is not adequate to describe satellite
a nnas or at an aircraft during a specific approach, the Type 5 m
to the aircraft.
3.6.7.2.1.1.5 Data broadcas
re
at every point within the coverage. The total mess
combined shall not exceed the maximum rates show
Note.— Guidance material concerning the use of multiple antenna systems is provided in Attachment D, 7.12.4.
3.6.7.2.1.2 Message block identifier. The MBI shall be set to either normal or test according to th
3 .4.1.
3.6.7.2.2 Pseudo-range corrections
3.6.7.2.2.1 Message laten
broadcast Type 1 or Type 101 m
Message type Minimum broadcast rate
1
s once per slot
4 All FAS blocks once per 20 consecutive frames All FAS blocks once per frame
5 All impacted sources once per 20 consecutive frames All impacted sources once per 5 consecutive
One Type 1 or Type 101 message or two Type 1 or Type 101 messages that are linked using the additional message flag described in 3.6.4.2.
or 101 For each measurement type:
All measurement blocks once per frame (Note)
For each measurement type:
All measurement block
2 Once per 20 consecutive frames Once per frame
frames
Note.—
APP B-109 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.6.7.2.2.2 Low-frequency data. Except during an ephemeris change, the first ranging source in the message shall
sequence so that the ephemeris decorrelation parameter, ephemeris CRC and source availability duration for each core
tellite constellation’s ranging source are transmitted at least once every 10 seconds. During an ephemeris change, the first
ng
ted at least once every 27 seconds. When new ephemeris
data are received from a core satellite constellation’s ranging source, the ground subsystem shall use the previous ephemeris
eris data before 3 minutes have passed. When this transition is made to using the new ephemeris
data for a given ranging source, the ground subsystem shall broadcast the new ephemeris CRC for all occurrences of that
ranging source in the low-frequency information of Type 1 or Type 101 message in the next 3 consecutive frames. For a
given ranging source, the ground subsystem shall continue to transmit data corresponding to the previous ephemeris data
ntil t
mmendation.— The ephemeris decorrelation parameter and the ephemeris CRC for each core
determined by
bining the pseudo-range correction estimates for the relevant ranging source calculated from each of the reference
receivers. For each satellite, the measurements used in this combination shall be obtained from the same ephemeris data. The
orrections shall be based on smoothed code pseudo-range measurements for each satellite using the carrier measurement
from a smoothing filter in accordance with 3.6.5.1.
3.6.7.2.2.4 Broadcast signal-in-space integrity parameters. The ground subsystem shall provide σpr_gnd and B
parameters for each pseudo-range correction in Type 1 message such that the protection level integrity risk requirements
ground subsystem shall provide σpr_gnd and, if necessary, B parameters for each
pse h that the protection level integrity risk requirements defined in 3.6.7.1.2.2
101 messages. Guidance material regarding the B
ara
3.6.7.2.2.5 Reference receiver measurements should be monitored. Faulted measurements or
3.6.7.2.2.6 Repeated transmission of Type 1 or Type 101 messages. For a given measurement type and within a given
　
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