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and A4.
Chapter 3 Annex 10 — Aeronautical Communications
3-97 23/11/06
3.11.5.4.1 Basic data
3.11.5.4.1.1 The basic data words 1, 2, 3, 4 and 6 shall be transmitted throughout the approach azimuth coverage sector.
Note.— The composition of the basic data words is given in Appendix A, Table A-7.
3.11.5.4.1.2 Where the back azimuth function is provided, basic data words 4, 5 and 6 shall be transmitted throughout
the approach azimuth and back azimuth coverage sectors.
3.11.5.4.2 Auxiliary data
3.11.5.4.2.1 Auxiliary data words A1, A2 and A3 shall be transmitted throughout the approach azimuth coverage
sector.
3.11.5.4.2.2 Where the back azimuth function is provided, auxiliary data words A3 and A4 shall be transmitted
throughout the approach azimuth and back azimuth coverage sectors.
Note.— Auxiliary data words B42 and B43 are transmitted in place of A1 and A4, respectively, to support applications
which require azimuth antenna rotation beyond the alignment range available in A1 and A4.
3.11.5.4.2.3 When provided, auxiliary data B words shall be transmitted throughout the approach azimuth sector,
except that the words comprising the back azimuth procedure database shall be transmitted throughout the back azimuth
sector.
3.11.5.4.2.4 Recommendation.— If the back azimuth function is provided, the appropriate auxiliary data B words
should be transmitted.
Note.— The composition of the auxiliary data words is given in Appendix A, Tables A-10, A-12 and A-15.
3.11.5.4.3 Monitor and control
3.11.5.4.3.1 The monitor system shall provide a warning to the designated control point if the radiated power is less
than that necessary to satisfy the DPSK requirement specified in 3.11.4.10.1.
3.11.5.4.3.2 If a detected error in the basic data radiated into the approach azimuth coverage occurs in at least two
consecutive samples, radiation of these data, approach azimuth and elevation functions shall cease.
3.11.5.4.3.3 If a detected error in the basic data radiated into the back azimuth coverage occurs in at least two
consecutive samples, radiation of these data and the back azimuth function shall cease.
3.11.5.5 Distance measuring equipment
3.11.5.5.1 DME information shall be provided at least throughout the coverage volume in which approach and back
azimuth guidance is available.
3.11.5.5.2 Recommendation.— DME information should be provided throughout 360° azimuth if operationally required.
Note.— Siting of DME ground equipment is dependent on runway length, runway profile and local terrain. Guidance on
siting of DME ground equipment is given in Attachment C, 7.1.6 and Attachment G, 5.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-98
3.11.6 Airborne equipment characteristics
3.11.6.1 Angle and data functions
3.11.6.1.1 Accuracy
3.11.6.1.1.1 Where the DPSK and scanning beam signal power densities are the minimum specified in 3.11.4.10.1, the
airborne equipment shall be able to acquire the signal and any decoded angle signal shall have a CMN not exceeding 0.1
degree, except that the back azimuth guidance function CMN shall not exceed 0.2 degree.
Note 1.— It is intended that basic and auxiliary data words which contain information essential for the desired operation
be decoded within a time period and with an integrity which is suitable for the intended application.
Note 2.— Information related to the acquisition and validation of angle guidance and data functions is given in
Attachment G, 7.3.
3.11.6.1.1.2 Where the radiated signal power density is high enough to cause the airborne receiver noise contribution to
be insignificant, the airborne equipment shall not degrade the accuracy of any decoded angle guidance signal by greater than
plus or minus 0.017 degree (PFE), and plus or minus 0.015 degree (azimuth), and plus or minus 0.01 degree (elevation) CMN.
3.11.6.1.1.3 In order to obtain accurate guidance to 2.5 m (8 ft) above the runway surface, the airborne equipment shall
produce less than 0.04 degree CMN with the power densities indicated in 3.11.4.10.2 b).
3.11.6.1.2 Dynamic range
3.11.6.1.2.1 The airborne equipment shall be able to acquire the signal and the performance in 3.11.6.1.1.2 shall be met
where the power density of any of the radiated signals has any value between the minimum specified in 3.11.4.10.1 up to a
maximum of minus 14.5 dBW/m2.
3.11.6.1.2.2 The receiver performance shall not degrade beyond the specified limits when the maximum differential
levels permitted in 3.11.6.1.2.1 exist between signal power densities of individual functions.
3.11.6.1.3 Receiver angle data output filter characteristics
3.11.6.1.3.1 For sinusoidal input frequencies, receiver output filters shall not induce amplitude variations or phase lags
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