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.6.7.1.1 and 3.6.8.2.1.
Note 5.— The signal levels specified in this section include a minimum standard antenna gain above 5 degree elevation
mum aircraft antenna gain in the lower hemisphere is –10 dBic. For non-standard
antennas with a different minimum gain above 5 degree elevation angle, the signal interference levels can be adjusted
accordingly as long as the relative interference-to-signal level is maintained.
Note 6.— The performance requirements are to be met in the interference environments defined below for various
phases of flight.
3.7.2 CONTINUOUS WAVE (CW) INTERFERENCE
wer level at the
o the interference thresholds specified in Table B-82 and shown in Figure B-15 and with a desired signal
na port.
3.7.2.1.2 GPS and SBAS receivers used for non-precision approach shall meet the performance objectives with
interference thresholds 3 dB less than specified in Table B-82. For terminal area and en-route steady-state navigation
operations and for initial acquisition of the GPS and SBAS signals prior to steady-state navigation, the interference thresholds
shall be 6 dB less than those specified in Table B-82.
.7.2.2 GLONASS RECEIVERS
3.7.2.2.1 GLONASS receivers used for the precision approach phase of flight or used on aircraft with on-board satellite
communications shall meet the performance objectives with CW interfering signals present with a power level at the antenna
port equal to the interference thresholds specified in Table B-83 and shown in Figure B-16 and with a desired signal level of
165.5 dBW at the antenna port.
tions due to signal propagation such as multipath, t
te 3.— For SBAS receivers, the resistance to interference is measured with respect
3
angle of –4.5 dBic. Assumed maxi
3.7.2.1 GPS AND SBAS RECEIVERS
3.7.2.1.1 GPS and SBAS receivers used for the precision approach phase of flight or used on aircraft with on-board
satellite communications shall meet the performance objectives with CW interfering signals present with a po
antenna port equal t
level of –164.5 dBW at the anten
3
–
APP B-121 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.7.2.2.2 GLONASS receivers used for non-precision approach shall meet the performance objectives with interference
thresholds 3 dB less than specified in Table B-83. For terminal area and en-route steady-state navigation operations and for
itial acquisition of the GLONASS signals prior to steady-state navigation, the interference thresholds shall be 6 dB less
an
rference thresholds for GPS and SBAS receivers
interference signal
s for receivers used for
precision approach phase of flight
in
th those specified in Table B-83.
Table B-82. CW inte
Frequency range fi of the Interference threshold
fi ≤ 1 315 MHz
1 315 MHz < fi ≤ 1 525 MHz Linearly decreasing from –4.5 dBW to –42 dBW
Hz < fi ≤ 1 610 MHz Linearly increasing from –150.5 dBW to –60 dBW
1 610 MHz < fi ≤ 1 618 MHz Linearly increasing from –60 dBW to –42 dBW*
000 MHz –8.5 dBW
* Applies to aircraft installations where there are no on-board satellite communications.
** Applies to aircraft installations where
–4.5 dBW
1 525 MHz < fi ≤ 1 565.42 MHz Linearly decreasing from –42 dBW to –150.5 dBW
1 565.42 MHz < fi ≤ 1 585.42 MHz –150.5 dBW
1 585.42 M
1 618 MHz < fi ≤ 2 000 MHz Linearly increasing from –42 dBW to –8.5 dBW*
1 610 MHz < fi ≤ 1 626.5 MHz Linearly increasing from –60 dBW to –22 dBW**
1 626.5 MHz < fi ≤ 2 000 MHz Linearly increasing from –22 dBW to –8.5 dBW**
fi > 2
there is on-board satellite communications.
Table B-83. Interference threshold for GLONASS receivers
Frequency range fi of the
interference signal
Interference thresholds for receivers used for
precision approach phase of flight
fi ≤ 1 315 MHz –4.5 dBW
1 315 MHz < f 562.15625 MHz Linearly decreasing from –4.5 dBW to –42 dBW
reasing from –42 dBW to –80 dBW
z Linearly decreasing from –80 dBW to –149 dBW
dBW
1 609.36 MHz < fi ≤ 1 613.65625 MHz Linearly increasing from –149 dBW to –80 dBW
1 613.65625 MHz < fi ≤ 1 635.15625 MHz Linearly increasing from –80 dBW to –42 dBW*
1 613.65625 MHz < fi ≤ 1 626.15625 MHz Linearly increasing from –80 dBW to –22 dBW**
1 635.15625 MHz < fi ≤ 2 000 MHz Linearly increasing from –42 dBW to –8.5 dBW*
1 626.15625 MHz < fi ≤ 2 000 MHz Linearly increasing from –22 dBW to –8.5 dBW**
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