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= xpp ypp;
= (1 – xpp) ypp;
d S85°:
W1
W2
W3
= (1 – xpp) (1 – ypp); and
W4 = xpp (1 – ypp).
3.5.5.5.3.1 For IPPs between N85° an
pp 1
xpp
2 1
λ − λ
=
λ − λ
pp 1
ypp
2 1
φ − φ
=
φ − φ
where
ngitude of IGPs west of IPP;
λ = longitude of IGPs east of IPP;
calculation of xpp must account for the discontinuity in longitude
alues.
3.5.5.5.3.2 For IPPs north of N85° or south of S85°:
λ1 = lo
2
φ1 = latitude of IGPs south of IPP; and
φ2 = latitude of IGPs north of IPP.
Note.— If λ 1 and λ 2 cross 180 degrees of longitude, the
v
pp 1
ypp
10
φ − φ
=
°
APP B-51 23/11/06
Annex 10 — Aeronautical Communications Volume I
pp 3
xpp (1 2 ypp pp
90
) y
λ − λ
= × − +
°
where
λ 1 = longitude of the second IGP to the east of the IPP;
o
ed vertical ionospheric delay estimated is:
λ 2 = longitude f the second IGP to the west of the IPP;
λ 3 = longitude of the closest IGP to the west of the IPP; and
λ 4 = longitude of the closest IGP to the east of the IPP.
When three points are used for interpolation, the interpolat
3.5.5.5.3.3 For points between S75° and N75°:
3
vpp k vk
k 1
W
=
τ =Σ τ
whe
W1
= ypp
2 –
3 pp
.5.
iangle defi ints, IGP1 has the same longitude as IGP2, and IGP3 has the same latitude as IGP2 (an
am le is sh
3.5.5.5.3 uth of S75°, three-point interpolation is not supported.
s). The protocol for the selection of IGPs is:
3) at define a 10-degree-by-10-degree cell around the IPP are set to “1” in the IGP mask, they
4) degree-by-10-degree triangle that circumscribes the IPP are set to “1” in the
)
1)
-by-10-degree longitude triangle that circumscribes the IPP are
d; else,
re
;
W = 1 xpp – ypp; and
W = x .
3 5.5.3.4 xpp and ypp are calculated as for four-point interpolation, except that λ 1 and φ1 are always the longitude and
latitude of IGP2, and λ2 and φ2 are the other longitude and latitude. IGP2 is always the vertex opposite the hypotenuse of the
tr ned by the three po
ex p own in Figure B-14).
.5 For points north of N75° and so
3.5.5.5.4 Selection of ionospheric grid points (IGP
a) For an IPP between N60° and S60°:
1) if four IGPs that define a 5-degree-by-5-degree cell around the IPP are set to “1” in the IGP mask, they are
selected; else,
2) if any three IGPs that define a 5-degree-by-5-degree triangle that circumscribes the IPP are set to “1” in the IGP
mask, they are selected; else,
if any four IGPs th
are selected; else,
if any three IGPs that define a 10-
IGP mask, they are selected; else,
5) an ionospheric correction is not available.
b For an IPP between N60° and N75° or between S60° and S75°:
if four IGPs that define a 5-degree-latitude-by-10-degree longitude cell around the IPP are set to “1” in the IGP
mask, they are selected; else,
2) if any three IGPs that define a 5-degree-latitude
set to “1” in the IGP mask, they are selecte
23/11/06 APP B-52
Appendix B Annex 10 — Aeronautical Communications
3) if any four IGPs that define a 10-degree-by-10-degree cell around the IPP are set to “1” in the IGP mask, they
cted; else,
nd N85° or between S75° and S85°:
ise) are set to “1” in the IGP mask, a 10-degree-by-10-degree cell is created by
linearly interpolating between the IGPs at 85° to obtain virtual IGPs at longitudes equal to the longitudes of the
1) if the four IGPs at N85° latitude and longitudes of W180°, W90°, 0° and E90° are set to “1” in the IGP mask,
2) an ionospheric correction is not available.
e) For an IPP south of S85°:
1) if the four IGPs at S85° latitude and W50°, E40° and E130° are set to “1” in the IGP
mask, they are selected; else,
2) an ionospheric correction is not available.
Note.— This selection is based only on hether the selected
monitored, “Not Monitored”, or “Do Not Use”. If any of the selected IGPs is identified as “Do Not Use”, an
available. If four IGPs are selected, and one of the four is identified as “Not Monitored”, then
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