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3 7.2.3 GBAS-related data
and refractivity uncertainty
3.6.7.1.2.2 are satisfied.
3.
3.6 .2.3.3 GBAS reference antenna phase centre position accuracy. For each
re
3.6.7.2.3.5 Ionospheric uncertainty estimate parameter. The grou
g sa
th ephemeris error position bound parameters using additional data block 1 in the Type 2 message.
3.6.7.2.3.7 Recommendation.— All ground subsystems should broadcast the ephemeris error position bound
parameters using additional data block 1 in the Type 2 message.
ground subsystem shall provid
ound subsystem integrity risk pr
i in 3.6.7.1.2.2 are met.
APP B-111 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.6.7.2.3.8.2 Ephemeris missed detection parameters. The ground subsystem shall broadcast the ephemeris missed
etection parameters for each core satellite constellation such that the ground subsystem integrity risk of 3.6.7.1.2.1 is met.
irements of
.6.7.1.2.1.2 and 3.6.7.1.2.2.2, the ground subsystem shall indicate using the RSDS parameter that the GBAS positioning
rvice is not provided.
st is transmitted at more than one frequency within the GRAS service area, each
ound subsystem shall broadcast additional data blocks 1 and 2.
3.6.7.2.3.9.1 Recommendation.— The VHF data broadcast should include additional data block 2 parameters to
identify channel numbers and locations of adjacent and nearby GBAS broadcast stations within the GRAS ground subsystem.
Note.— This facilitates the transition from one GBAS broadcast station to other GBAS broadcast stations in the GRAS
subsystem.
3.6.7.2.4 Final approach segment data
3.6.7.2.4.1 FAS data points accuracy. The relative survey error between the FAS data points and the GBAS reference
oin
S, the survey error of all the FAS data points, relative to
3.6.7.2.4.3 Recommendation.— The final approach segment CRC should be assigned at the time of procedure design,
nd kept as an integral part of the FAS data block from that time onward.
3.6.7.2.4.4 Recommendation.— The GBAS should allow the capability to set the FASVAL and FASLAL for any FAS
ata
3.6.7.2.6 Integrity monitoring for GNSS ranging sources. The ground subsystem shall monitor the satellite signals to
rossing for airborne receivers that
se the Early-Late discriminator function as described in Attachment D, 8.11.
3.6.7.3 MONITORING
3.6.7.3.1 RF monitori
3.6.7.3.1.1 VHF data broadcast monitoring The data broadcast transmissions shall be mon ored. The transmission of
the data shall cease within 0.5 seconds in case of continuo sagreement during any 3 nd period between the
transmitted application data and the application dat derived or st by the monitoring system pri to transmission.
d
3.6.7.2.3.8.3 GBAS positioning service indication. If the ground subsystem does not meet the requ
3 se
3.6.7.2.3.9 If the VHF data broadca
GBAS broadcast station within the GRAS gr
ground
p t shall be less than 0.25 metres vertical and 0.40 metres horizontal.
3.6.7.2.4.2 SBAS FAS data points accuracy. For use with SBA
WGS-84, shall be less than 0.25 metres vertical and 1 metre horizontal.
a
d block to “1111 1111” to limit the approach to lateral only or to indicate that the approach must not be used,
respectively.
3.6.7.2.5 Predicted ranging source availability data
Note.— Ranging source availability data are optional for Category I and APV and may be required for possible future
operations.
detect conditions that will result in improper operation of differential processing for airborne receivers complying with the
tracking constraints in Attachment D, 8.11. The ground subsystem shall use the strongest correlation peak in all receivers
used to generate the pseudo-range corrections. The monitor time-to-alert shall comply with 3.6.7.1.2. The monitor action
shall be to set σpr_gnd to the bit pattern “1111 1111” for the satellite or to exclude the satellite from the Type 1 or Type 101
message. The ground subsystem shall also detect conditions that cause more than one zero c
u
ng
. it
us di
ored
-seco
a or
23/11/06 APP B-112
Appendix B Annex 10 — Aeronautical Communications
3.6.7.3.1.2 TDMA slot monitoring. The risk that the ground subsystem transmits a signal in an unassigned slot and fails
to detect an out-of-slot transmission, which exceeds that allowed in 3.6.2.6, within 1 second, s ss than 1 × 10–7 in any
30-second period. If out-of-slot transmissions are detected, t round subsystem shall terminate all data broadcast
transmissions within 0.5 seco .
3.6.7.3.1.3 VDB transmitter power monitor. The probability that the horizontally or elliptically polarized signal’s
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