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Note.— The RPDS for a given FAS data block is different from every other RPDS and every reference station data
selector (RSDS) broadcast on the same frequency by every GBAS within the broadcast region.
Reference path identifier: the three or four alphanumeric characters used to uniquely designate the reference path.
6
used. The rightmost character is transmitted first. For a three-character
-5 “space”.
Note.— The LTP/FTP is a point over which the FAS path passes at a relative height specified by the TCH. LTP is
ormally located at the intersection of the runway centreline and the threshold.
Co Positive value denotes north latitude.
Negative value denotes south latitude.
nt in arc seconds.
numeric digits and IA-5 “space” are used. The rightmost character is transmitted first. For a three-character GBAS
ID,
Coding: 0 =
1 to 36 = r
Coding: 0 = no letter
1 = R (right)
2 = C (centre)
3 = L (left)
performance designator: the general information about
Coding: 0 = APV
1 = Category I
2 = reserved for Category
R
Coding: Each character is coded using bits b1 through b6 of its IA-5 representation. For each character, b1 is transmitted first,
and 2 zero bits are appended after b so that 8 bits are transmitted for each character. Only upper case letters,
numeric digits and IA-5 “space” are
reference path identifier, the rightmost (first transmitted) character shall be IA
n
LTP/FTP latitude: the latitude of the LTP/FTP point in arc seconds.
ding:
LTP/FTP longitude: the longitude of the LTP/FTP poi
APP B-91 23/11/06
Annex 10 — Aeronautical Communications Volume I
23/11/06 APP B-92
Coding: Positive value denotes east longitude.
Negative value denotes west longitude.
LTP/FTP height: the height of the LTP/FTP above the WGS-84 ellipsoid.
Coding: This field is coded as an unsigned fixed-point number with an offset of –512 metres. A value of zero in this field
places the LTP/FTP 512 metres below the earth ellipsoid.
Note.— The FPAP is a point at the same height as the LTP/FTP that is used to define the alignment of the approach. The
origin of angular deviations in the lateral direction is defined to be 305 metres (1 000 ft) beyond the FPAP along the lateral
FAS path. For an approach aligned with the runway, the FPAP is at or beyond the stop end of the runway.
ΔFPAP latitude: the difference of latitude of the runway FPAP from the LTP/FTP in arc seconds.
Coding: Positive value denotes the FPAP latitude north of LTP/FTP latitude.
Negative value denotes the FPAP latitude south of the LTP/FTP latitude.
ΔFPAP longitude: the difference of longitude of the runway FPAP from the LTP/FTP in arc seconds.
Coding: Positive value indicates the FPAP longitude east of LTP/FTP longitude.
Negative value indicates the FPAP longitude west of LTP/FTP longitude.
Approach TCH: the height of the FAS path above the LTP/FTP defined in either feet or metres as indicated by the TCH units
selector.
Approach TCH units selector: the units used to describe the TCH.
Coding: 0 = feet
1 = metres
Glide path angle (GPA): the angle of the FAS path with respect to the horizontal plane tangent to the WGS-84 ellipsoid at the
LTP/FTP.
Course width: the lateral displacement from the path defined by the FAS at the LTP/FTP at which full-scale deflection of a
course deviation indicator is attained.
Coding: This field is coded as an unsigned fixed-point number with an offset of 80 metres. A value of zero in this field
indicates a course width of 80 metres at the LTP/FTP.
ΔLength offset: the distance from the stop end of the runway to the FPAP.
Coding: 1111 1111 = not provided
Final approach segment CRC: the 32-bit CRC appended to the end of each FAS data block in order to ensure approach data
integrity. The 32-bit final approach segment CRC shall be calculated in accordance with 3.9. The length of the CRC code
shall be k = 32 bits.
The CRC generator polynomial shall be:
G(x) = x32 + x31 + x24 + x22 + x16 + x14 + x8 + x7 + x5 + x3 + x + 1
The CRC information field, M(x), shall be:
Appendix B Annex 10 — Aeronautical Communications
M(x) = Σ mix272–i = m1x271 + m2x270 + . . . + m272x0
M(x) shall be formed from all bits of the associated FAS data block, excluding the CRC. Bits shall be arranged in the order
f the operation type field, and m272 corresponds to the MSB of the Δlength
ffset field. The CRC shall be ordered such that r1 is the LSB and r32 is the MSB.
3.6.4.6 Type 5 message — predicted ranging source availability. When used, the Type 5 message shall contain rising
isible ranging sources. Predicted ranging source availability
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