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deviation indicator is achieved, both the lateral and vertical alert limits are set to the maximum values given in the tables.
3.6.5.6.2 APV alert limits. The alert limits are equal to the FASLAL and FASVAL for approaches with channel
in the range of 20 001 to 39 999. For approaches with channel numbers in the range 40 000 to 99 999, the alert
mits are stored in the on-board database.
3.6.5.7 Channel number. Each GBAS approach transmitted from the ground subsystem is associated with a channel
number in the range of 20 001 to 39 999. If provided, the GBAS positioning service is associated with a separate channel
number in the range of 20 001 to 39 999. The channel number is given by:
Channel number = 20 000 + 40(F – 108.0) + 411(S)
where
F = the data broadcast frequency (MHz)
S = RPDS or RSDS
DS = the reference station data selector for the GBAS ground subsystem (as defined in 3.6.4.3.1)
k 2 of Type 2 message (as defined in 3.6.4.3.2.1), only RSDS are
sed.
Table B-68. Category I lateral alert limit
Horizontal distance of aircraft position
from the LTP/FTP as translated
along the final approach path
(metres)
Lateral alert limit
(metres)
numbers
li
and
RPDS = the reference path data selector for the FAS data block (as defined in 3.6.4.5.1)
RS
For channel numbers transmitted in the additional data bloc
u
291 < D ≤ 873 FASLAL
873 < D ≤ 7 500 0.0044D (m) + FASLAL – 3.85
D > 7 500 FASLAL + 29.15
Table B-69. Category I vertical alert limit
Height above LTP/FTP of aircraft position
translated onto the final approach path
(feet)
Vertical alert limit
(metres)
100 < H ≤ 200 FASVAL
200 < H ≤ 1 340 0.02925H (ft) + FASVAL – 5.85
H > 1 340 FASVAL + 33.35
APP B-101 23/11/06
Annex 10 — Aeronautical Communications Volume I
Note 1.— When the FAS is not broadcast for an APV, the GBAS approach is associated with a channel number in the
range 40 000 to 99 999.
Note 2.— Guidance material concerning channel number selection is provided in Attachment D, 7.7.
3.6.5.8 EPHEMERIS ERROR POSITION BOUND
Note.— Ephemeris error position bounds are computed only for core satellite constellation ranging sources used in the
position s d not for other types of ran sources (SB r pseudolites) e not subject to
undetecte ever, the calculation of these positio nformation from all ranging sources
used in th
3.6.5.8.1 Category I precision approach and APV. The vertical and lateral ephemeris error position bounds are defined as:
VEB = MAX{VEBj}
j
LEB = MAX{LEBj}
j
The vertical and lateral e osition bound or the jth core stellation rang ng sour used in the
position solution are given by:
olution (j index) an ging
s
AS satellites o
n b e i
that ar
d ephemeris failures. How ounds us
e position solution (i index).
phemeris error p s f satellite con i ce
N
2 2
j j air j md_e,j
i 1
VEB s_vert x K s_
=
= + Σ
P verti × σi
N
2 2
j j air j md_e,j i i
i 1
LEB s_lat x P K s_lat
=
= + Σ × σ
where:
s_vert ined in 3.6.5.5.1.1
s_lati or j is defined in 3.6.5.5.1.1
xair 3.6.5.4
N ging sources used in the pos solution
σi
Pj s decorrelation paramet for the jth ranging
Kmd_e,j d detection multiplier for Category I precision approach and APV associated
he jth ranging rce (Kmd_e,GPS or Kmd_e,GLONASS)
3. ervice. The horizontal ep positio efined as:
HEB = M HEBj}
The hor bound for the jth e satellite con nging source u e position
solution
i or j is def
is defined in
is the number of ran ition
is defined in 3.6.5.5.1.1
is the broadcast ephemeri er source
is the broadcast ephemeris misse
with the satellite constellation for t sou
6.5.8.2 GBAS positioning s hemeris error n bound is d
AX{
j
izontal ephemeris error position cor stellation ra sed in th
is given by:
d
HEBj= shorz,j xairPj+Kmd_e_POS major
23/11/06 APP B-102
Appendix B Annex 10 — Aeronautical Communications
where:
is as defined in 3.6.5.5.2.
sy,j is as defined in 3.6.5.5.2
xair is defined in 3.6.5.4
Pj broadcast ephemeris decorrelation para he jth ranging source
Kmd_e_P is the broadcast ephemeris missed detection m lier for the GBAS positioning service asso iated with the
r the jth ranging source (K POS,GPS or Kmd_ NASS)
dmajor
3.6.6 M ES
Each l be coded in accordance with th rresponding m defined in Tabl -70 through
　
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