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inclusive:
a) identifiers 0 and 1 are used when the next way-point in the procedure is not a shared way-point, or is a shared waypoint
coded for the first time;
b) identifiers 2 and 3 are used to refer to the next way-points in the procedure that are already coded and shared with
another procedure. The coding of these way-points is not repeated but the index allows the connection of the
procedure to the shared way-points of the other procedure;
c) identifiers 4 and 5 are used in the next-to-last way-point for procedures ending or beginning on the primary runway.
The last way-point is the threshold. For this way-point only, the threshold crossing height is specified since the exact
location of the threshold with respect to the MLS datum is given in the auxiliary A words. Identifier 4 is used when
the MLS/RNAV missed approach guidance is not required, and identifier 5 is used when a “missed approach index”
follows;
d) identifiers 6 and 7 are used for the final way-point of any procedure except as noted in c) above. For the primary
runway these identifiers are used if there is a need to fully specify the X, Y and Z coordinates of the last way-point.
These identifiers are also used for secondary runways and helipads. Identifier 6 is used when no missed approach is
following and identifier 7 when a missed approach follows; and
e) identifiers 5 and 7 do not apply to missed approaches and departures.
2.7.3.10 Following the convention for other MLS basic and auxiliary data, all digital data encoded in the database are
transmitted with the least significant bit first and the sign bit is transmitted as the most significant bit, with a ONE indicating
a negative value. It is noted that the auxiliary data word addresses used to indicate the last approach azimuth database word
and the first back azimuth database word are transmitted with the most significant bit first.
ATT G-9 23/11/06
Annex 10 — Aeronautical Communications Volume I
2.7.4 Example application of MLS/RNAV data words
2.7.4.1 The following paragraphs provide an example of the data assignment process for MLS/RNAV data words
contained in auxiliary data words B1-B39. A sample set of approach and departure procedures is provided and the process by
which the various way-points and associated procedure characteristics are interpreted and formatted for transmission is
described.
2.7.4.2 Table G-3 depicts a set of sample approach, missed approach, and departure procedures for two hypothetical
runways. Table G-4 contains way-point data for the sample procedures indicated in Table G-3 and illustrated in Figure G-15.
2.7.4.3 Prior to inserting the procedures data into the structure of B1-B39, the characteristics of the MLS/RNAV data
must be understood in order to optimally use the available number of data words. In the data set of Tables G-3 and G-4, the
following specific characteristics can be noted: procedures KASEL and NELSO share the same way-points No. 1 (WP 1) and
No. 2 (WP 2); procedures KASEL and NELSO link to a missed approach procedure; procedure SEMOR is a secondary
runway approach; procedure LAWSO is a departure procedure and will be transmitted in back azimuth coverage; all waypoints
outside of the precision final approach fix (PFAF) will not require the Z coordinate to be transmitted; the Y coordinate
will not have to be transmitted for several way-points that are located on the extended primary runway centre line.
2.7.4.4 Data word B1 specified in Appendix A, Table A-15, defines the structure of the MLS/RNAV data to be
transmitted in the approach azimuth coverage sector. This word also contains the approach azimuth CRC code. The number
of procedures to be transmitted in the approach azimuth sector is 3. This can be determined from Table G-3. The data word
address with the last approach azimuth MLS/RNAV data word is determined after the complete set is inserted into the format.
In this case, the address of the last word is B11. The CRC code is calculated as described in Note 3 to Table A-15. Words
B42 and B43 are not transmitted so that the relevant bits are set to ZERO. Word A4 is transmitted so that the relevant bit is
set to ONE. The coding for data word B1 is shown in Table G-5.
2.7.4.5 Data word B39 specified in Appendix A, Table A-15 defines the structure of the MLS/RNAV data to be
transmitted in the back azimuth coverage sector. This word also contains the back azimuth CRC code. The number of
procedures to be transmitted in the back azimuth sector is 1. The data word address with the first back azimuth MLS/RNAV
data word is determined after the complete set is inserted into the format. In this case the address of the first word is B36. The
CRC code is calculated as described in Note 3 to Table A-15. Word B43 is not transmitted so that bit is set to ZERO. The
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