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precision approach or APV protection level and, if additional data block 1 is broadcast, the ephemeris error position bound.
T e 1 messages are broadcast.
Note.— The
e
3.6.7.1.2.1.1.2 The GBAS ground subsystem maximum time-to-alert shall be less than or equal to 5.5 seconds when
Type 101 messages are broadcast.
lateral alert limit field of the Type 4 message shall be no greater than 40 metres, and the value FASVAL for each FA
a
3.6.7.1.
g
3.6.7.1.2.1.2 GBAS positioning service
in
Note 1.— The integrity risk assigned to the GBAS ground subsystem is a subset of the GBAS signal-in-space integrity
risk, where the protection level integrity risk (3.6.7.1.2.2.2) has been
c sa
defined as the probability that t
mation w
n out-of-tolera
by a fault-free receiver
tive position error witho
d be used by the aircraft,
er than the maximum timert.
An out
el and the
of-tolerance horizontal relative position error is
orizontal ephemeris error position bound.
APP B-107 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.6.7.1.2.1.2.1 The GBAS ground subsystem maximum time-to-alert shall be less than or equal to 3 seconds when
Type 1 messages are broadcast and less than or equal to 5.5 seconds when Type 101 messages are br adcast.
N .— T between the onset of the horizontal relative position error
and th ansm ge that contains the integri ndition.
3.6.7.1 .2 P
3. 1.2.2.1 For a GBAS ground subsystem that provides the Cate ction
el integrity risk shall be less than 5 × 10–8 per approach.
d
asurement conditions defined in 3.6.5.5.2.2.
data broadcast field strength is within the specified range and the
protection levels are lower than the alert limits unless configuration changes occur due to the space segment.
3.6.7.1.3.2 Continuity of service for positioning service
Note.— For GBAS ground subsystems that provide the GBAS positioning service, there may be additional continuity
requirements depending on the intended operations.
.6.
em shall not broadcast both Type 1 and Type 101 messages.
o
ote he time-to-alert above is the time
ssion of the last bit of the messa
out-of-tolerance
e tr i ty data that reflects the co
.2 rotection level integrity risk
6.7. gory I precision approach or APV, the prote
lev
Note.— The Category I precision approach and APV protection level integrity risk is the integrity risk due to undetecte
errors in position relative to the GBAS reference point greater than the associated protection levels under the two following
conditions:
a) normal measurement conditions defined in 3.6.5.5.1.1; and
b) faulted measurement conditions defined in 3.6.5.5.1.2.
3.6.7.1.2.2.2 For a GBAS ground subsystem that provides the positioning service, protection level integrity risk shall
be less than 10–9 per hour.
Note.— The GBAS positioning service protection level integrity risk is the integrity risk due to undetected errors in the
horizontal position relative to the GBAS reference point greater than the GBAS positioning service protection level under the
two following conditions:
a) normal measurement conditions defined in 3.6.5.5.2.1; and
b) faulted me
3.6.7.1.3 Continuity of service
3.6.7.1.3.1 Continuity of service for Category I precision approach and APV. The GBAS ground subsystem continuity
of service shall be greater than or equal to 1 – 3.3 × 10–6 during any 15 seconds.
Note.— The GBAS ground subsystem continuity of service is the probability that during any 15-second period the VHF
data broadcast transmits data in tolerance, VHF
3.6.7.2 FUNCTIONAL REQUIREMENTS
3 7.2.1 General
3.6.7.2.1.1 Data broadcast rates
3.6.7.2.1.1.1 A GBAS ground subsystem that supports Category I precision approach or APV-II shall broadcast Type 1
messages. A GBAS ground subsystem that does not support Category I precision approach or APV-II shall broadcast either
Type 1 or Type 101 messages. A GBAS ground subsyst
23/11/06 APP B-108
Appendix B Annex 10 — Aeronautical Communications
Note.— Guidance material concerning usage of the Type 101 message is provided in Attachment D, 7.18.
3.6.7.2.1.1.3 Each GBAS ground subsystem shall broadcast FAS blocks in Type 4 messages for all Category I
l broadcast additional data block 1 in the Type 2 message.
ne database. FAS blocks may also be broadcast to support operations by aircraft without an airborne database. These
ent D, 7.7.
. ast the Type 5 message at a rate in
cco n
visibility at either the ground subsystem
nte essage may be used to broadcast additional information
　
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