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Table 3.7.3.5-1 (located at the end of section 3.7).
3.7.3.5.4.6 Unwanted emissions. Unwanted emissions, including spurious and out-of-band emissions, shall be
compliant with the levels shown in Table 3.7.3.5-2 (located at the end of section 3.7). The total power in any VDB harmonic
or discrete signal shall not be greater than –53 dBm.
3.7.3.5.5 Navigation information. The navigation data transmitted by GBAS shall include the following information:
a) pseudo-range corrections, reference time and integrity data;
b) GBAS-related data;
c) final approach segment data when supporting precision approach; and
d) predicted ranging source availability data.
Note.— Structure and contents of data are specified in Appendix B, 3.6.3.
Chapter 3 Annex 10 — Aeronautical Communications
3-69 23/11/06
3.7.3.6 Aircraft GNSS receiver
3.7.3.6.1 The aircraft GNSS receiver shall process the signals of those GNSS elements that it intends to use as
specified in Appendix B, 3.1 (for GPS), Appendix B, 3.2 (for GLONASS), Appendix B, 3.3 (for combined GPS and
GLONASS), Appendix B, 3.5 (for SBAS) and Appendix B, 3.6 (for GBAS and GRAS).
3.7.4 Resistance to interference
3.7.4.1 GNSS shall comply with performance requirements defined in 3.7.2.4 and Appendix B, 3.7 in the presence of
the interference environment defined in Appendix B, 3.7.
Note.— GPS and GLONASS operating in the frequency band 1 559 – 1 610 MHz are classified by the ITU as providing
a radio navigation satellite service (RNSS) and aeronautical radio navigation service (ARNS) and are afforded special
spectrum protection status for RNSS. In order to achieve the performance objectives for precision approach guidance to be
supported by the GNSS and its augmentations, RNSS/ARNS is intended to remain the only global allocation in the 1 559 –
1 610 MHz band and emissions from systems in this and adjacent frequency bands are intended to be tightly controlled by
national and/or international regulation.
3.7.5 Database
Note.— SARPs applicable to aeronautical data are provided in Annex 4, Annex 11, Annex 14 and Annex 15.
3.7.5.1 Aircraft GNSS equipment that uses a database shall provide a means to:
a) update the electronic navigation database; and
b) determine the Aeronautical Information Regulation and Control (AIRAC) effective dates of the aeronautical
database.
Note.— Guidance material on the need for a current navigation database in aircraft GNSS equipment is provided in
Attachment D, 11.
3.7.6 Status monitoring and NOTAM
3.7.6.1 Changes in the current and projected status of GNSS space and ground elements that may have an impact on
user performance or operational approvals shall be reported to relevant air traffic service units.
Note 1.— Additional information is provided in Attachment D, 9.
Note 2.— To assess the operational impact of changes in status, a service prediction tool may be required.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-70
Table 3.7.2.4-1 Signal-in-space performance requirements
Typical operation
Accuracy
horizontal
95%
(Notes 1 and 3)
Accuracy
vertical
95%
(Notes 1 and 3)
Integrity
(Note 2)
Time-to-alert
(Note 3)
Continuity
(Note 4)
Availability
(Note 5)
En-route 3.7 km
(2.0 NM)
(Note 6)
N/A 1 – 1 × 10–7/h 5 min 1 – 1 × 10–4/h
to 1 – 1 × 10–8/h
0.99 to
0.99999
En-route,
Terminal
0.74 km
(0.4 NM)
N/A 1 – 1 × 10–7/h 15 s 1 – 1 × 10–4/h
to 1 – 1 × 108/h
0.99 to
0.99999
Initial approach,
Intermediate approach,
Non-precision approach (NPA),
Departure
220 m
(720 ft)
N/A 1 – 1 × 10–7/h 10 s 1 – 1 × 10–4/h
to 1 – 1 × 10–8/h
0.99 to
0.99999
Approach operations with
vertical guidance (APV-I)
16.0 m
(52 ft)
20 m
(66 ft)
1 – 2 × 10–7
per
approach
10 s 1 – 8 × 10–6
in any 15 s
0.99 to
0.99999
Approach operations with
vertical guidance (APV-II)
16.0 m
(52 ft)
8.0 m
(26 ft)
1 – 2 × 10–7
per
approach
6 s 1 – 8 × 10–6
in any 15 s
0.99 to
0.99999
Category I precision approach
(Note 8)
16.0 m
(52 ft)
6.0 m to 4.0 m
(20 ft to 13 ft)
(Note 7)
1 – 2 × 10–7
per
approach
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