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2 9 < BW ≤ 15 MHz 0.05 – 0.2 0.045 – 0.22 ≤ 100 ns
3 15 < BW ≤ 18 MHz 0.05 – 0.1 0.045 – 0.11 ≤ 100 ns
Table D-13. GPS tracking constraints for double-delta correlators
Region
3 dB precorrelation
bandwidth,
BW
Average correlator
spacing range
(chips)
Instantaneous correlator
spacing range
(chips)
Differential
group delay
1 2 < BW ≤ 7 MHz 0.045 – 0.6 0.04 – 0.65 ≤ 600 ns
2 7 < BW ≤ 14 MHz 0.045 – 0.24 0.04 – 0.26 ≤ 150 ns
3 14 < BW ≤ 16 MHz 0.07 – 0.24 0.04 – 0.26 ≤ 150 ns
Table D-14. SBAS ranging function tracking constraints
Region
3 dB precorrelation
bandwidth,
BW
Average
correlator spacing
(chips)
Instantaneous
correlator spacing
(chips)
Differential
group delay
1 2 < BW ≤ 7 MHz 0.045 – 1.1 0.04 – 1.2 ≤ 600 ns
2 7 < BW ≤ 20 MHz 0.045 – 1.1 0.04 – 1.2 ≤ 150 ns
23/11/06 ATT D-48
Attachment D Annex 10 — Aeronautical Communications
9.2 Information on type of degradation
The following information is to be distributed:
a) non-availability of service;
b) downgrade of service, if applicable; and
c) time and expected duration of degradation.
9.3 Timing of notification
For scheduled events, notification should be given to the NOTAM authority at least 72 hours prior to the event. For
unscheduled events, notification to the NOTAM authority should be given within 15 minutes. Notification should be given
for events of 15-minute, or longer, duration.
10. Interference
10.1 Potential for interference
Satellite radio navigation systems such as GPS and GLONASS feature relatively weak received signal power, meaning that
an interference signal could cause loss of service. In order to maintain service, it will be necessary to ensure that the
maximum interference levels specified in the SARPs are not exceeded.
10.2 Specification of the interference threshold at the antenna port
The indications of the interference threshold levels are referenced to the antenna port. In this context, the term “antenna port”
means the interface between the antenna and the GNSS receiver where the satellite signal power corresponds to the nominal
minimum received signal power of –164.5 dBW for GPS and –165.5 dBW for GLONASS. Due to the reduced distance from
potential interference sources, GNSS receivers that are used for the approach phase of flight must have a higher interference
threshold than receivers that are only used for en-route navigation.
10.3 In-band interference sources
A potential source of in-band harmful interference is Fixed Service operation in certain States. There is a primary allocation
to the fixed service for point-to-point microwave links in certain States in the frequency band used by GPS and GLONASS.
10.4 Out-of-band interference sources
Potential sources of out-of-band interference include harmonics and spurious emissions of aeronautical VHF and UHF
transmitters. Out-of-band noise, discrete spurious products and intermodulation products from radio and TV broadcasts can
also cause interference problems.
10.5 Aircraft generated sources
10.5.1 The potential for harmful interference to GPS and GLONASS on an aircraft depends on the type of aircraft, its
size and the transmitting equipment installed. The GNSS antenna location should take into account the possibility of onboard
interference (mainly SATCOM).
ATT D-49 23/11/06
Annex 10 — Aeronautical Communications Volume I
10.5.2 GNSS receivers that are used on board aircraft with SATCOM equipment must have a higher interference
threshold in the frequency range between 1 610 MHz and 1 626.5 MHz than receivers on board aircraft without SATCOM
equipment. Therefore, specifications for the interference threshold discriminate between both cases.
Note.— Limits for radiated SATCOM aircraft earth stations are given in Annex 10, Volume III, Part I, Chapter 4, 4.2.3.5.
10.5.3 The principal mitigation techniques for on-board interference include shielding, filtering, receiver design
techniques, and, especially on larger aircraft, physical separation of antennas, transmitters and cabling. Receiver design
techniques include the use of adaptive filters and interference cancellation techniques that mitigate against narrow in-band
interference. Antenna design techniques include adaptive null steering antennas that reduce the antenna gain in the direction
of interference sources without reducing the signal power from satellites.
10.6 Integrity in the presence of interference
The requirement that SBAS and GBAS receivers do not output misleading information in the presence of interference is
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