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2. This field is coded in accordance with Table A-9, using bits I13 through I18. In this table, bit I25 carries the information of bit I13 from Table A-9 and is
transmitted first.
3. The CRC code contains the remainder, R(x), of the modulo 2 division of two polynomials:
32 ( ) ( ) ( )
( ) mod 2 ( )
x M x Q x R x
G x G x
⎡ ⎤
⎢ ⎥ = +
⎢⎣ ⎥⎦
M(x) is the information field, which consists of the approach azimuth or back azimuth database defined below, excluding the preambles, addresses,
parity bits, and CRC code bits. For auxiliary data words these are bits I21 to I69, and for basic data words bits I13 to I30. The database consists of the
following data words in the order listed:
Approach azimuth database: Back azimuth database:
B1 (bits I21 to I30, I63 to I69) B(b) to B38
B2 to B(a) B39 (bits I21 to I30, I63 to I69)
B40, B41 B40, B41, A3
A1 or B42, A2, A3 A4 or B43 (if transmitted)
A4 or B43 (if transmitted) Basic data word 6
Basic data word 6
M(x) is multiplied by x32, which appends 32 zero bits to the end of the dividend.
G(x) is the generator polynomial, defined as follows:
G(x) = x32 + x31 + x14 + x13 + x9 + x8 + x4 + x3 + x + 1
Q(x) is the quotient of the division.
The CRC code, R(x), is transmitted with the coefficient of x31 as bit I31 and the coefficient of x0 as bit I62.
4. The convention for coding is as follows:
0 = no
1 = yes
5. Alpha characters are coded as defined in 3.11.4.8.3 for data words B1 through B39.
6. The convention for coding is as follows:
0 = no letter
1 = R (right)
2 = C (centre)
3 = L (left)
7. The convention for coding is as follows:
0 = approach procedure
1 = departure procedure
8. Waypoint index numbers are assigned by sequentially numbering all waypoints in the approach azimuth or back azimuth database. If a waypoint at the
primary runway threshold is coded using only a threshold crossing height, it is omitted from the waypoint index sequence.
9. A value of zero in this field indicates that the procedure is a computed centre line procedure based on data contained in auxiliary data words A1 (or
B42), A2, A3 and A4 (or B43).
10. Waypoint definitions are of variable length and are coded sequentially without conforming to word boundaries. Spare bits are not permitted between
waypoint definitions. Any spare bits at the end of the last waypoint data word are set to zero. Waypoint definitions for an approach procedure are coded
in the order that the aircraft flies the procedure. Waypoint definitions for a missed approach or departure are coded in the reverse order. Missed
approach or departure waypoints which are not shared with approach waypoints are coded after the last approach waypoint in the database.
11. A facility without a back azimuth data base may employ auxiliary word B39 as a waypoint data word for the approach azimuth database. Bit I69 of
word B39 is used to indicate the application of this word. The convention for coding is as follows:
0 = word B39 is a waypoint data word
1 = word B39 is the back azimuth map/CRC word
12. All spare bits are set to ZERO.
13. Parity bits I70 to I76 are chosen to satisfy the equations given in Note 1 of Table A-12.
14. The coded value 0000 is not allowed.
15. Runway number designation 0 is for heliport operations.
23/11/06 APP A-20
Appendix A Annex 10 — Aeronautical Communications
APP A-21 23/11/06
Table A-16. Waypoint definition data items
(see 3.11.4.8.3.2)
Data content
Bits
used
Range
of
values
Least
significant
bit
X coordinate 15 ±41 940 m
(see Notes 1, 2)
2.56 m
Y coordinate follows 1 See Note 3
Y coordinate 15 ±41 940 m
(see Notes 1, 2)
2.56 m
Z coordinate follows 1 See Note 3
Z coordinate 13 –100 to +8 091 m
(see Notes 1, 4)
1 m
Next segment/field identifier 3 See Note 5
Threshold waypoint height 6 0 to 31.5 m
(see Note 5)
0.5 m
Virtual azimuth to waypoint distance 6 0 to 6 300 m
(see Note 5)
100 m
Next waypoint index 6 See Notes 5, 6
Missed approach index 6 See Notes 5, 6
NOTES.—
1. The origin of the coordinate system is the MLS datum point. The X-axis is horizontal, and lies in the vertical plane
containing the runway centre line, with a positive number representing a location toward the approach reference
datum. The Y-axis is horizontal and perpendicular to the X-axis, with a positive number representing a location to the
left of centre line as viewed from the MLS datum point looking toward the approach reference datum. The Z-axis is
vertical, with a positive number representing a location above the MLS datum point. Earth curvature is not considered
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