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product shall be at least 24 dB below the EIRP of each carrier
when transmitting two equal carriers with a total EIRP equal
to the maximum allowable operating ETRP of the AES in the
band 1 626.5 to 1 660.5 MHz.
4.2.3.5.1 .I For low gain antenna operation, the minimum
value of EIRP per carrier in the direction of the satellite, when
commanded to the maximum setting, shall be 13.5 dBW. The
EIRP radiated in any direction shall not exceed 22.8 dBW. * All tables are located at the end of this chapter
Part I Annex 10 - Aeronautical Telecommunications
4.2.3.5.8 Out-qf-band EJRP density levels. Whrn transmitting
a carrier at any level up to the maximum power level
as described in 4.2.3.5.1, the out-of-band ETRP including
spurious, harmonics and noise generated by the AES in any
direction shall not exceed the levels shown in Table 4-3.
4.2.3.5.8.1 AMSS transmissions shall not cause harmful
interference to satellite navigation receiver operation where
such receiver is operated on the same aircraft as the AES.
4.2.3.5.8.2 Recommendation, The EIRP densiiy
should not exceed -140 dBc/l MHz from 1 598 to 1 609.26
MHz.
4.2.3.5.9 Phase noise. The phase noise induced on a
modulated carrier shall have a power spectral density not
exceeding-the envelope defined in Table 4-4.
4.2.3.5.10 Transmitter Doppler rate. The maximum rate
of change of the frequency of the transmitted signal when
compensated for aircraft acceleration in the direction of the
satellite shall not exceed 15 Hz per second. The Doppler
adjustment resolution shall not exceed 10 Hz and the associated
frequency changes shall be made without introducing
phase discontinuity into the transmitted signal.
4.3 RF CHANNEL
CHARACTERISTICS
4.3.1 Modulation
4.3.1.1 Modulation for channel rates 2.4 kbits/s and
below. For channel rates of 2.4, 1.2 and 0.6 kbitsls, the
modulation shall be aviation binary phase shift keying
( A-BPSK).
4.3.1.2 Modularion for chunnel rates above 2.4 kbits/s.
For channel rates above 2.4 kbits/s the modulation shall be
aviation quadrature phase shift keying (A-QPSK).
4.3.2 Radiated power spectral densin. The following
bounds on radiated power spectral density shall apply in any
direction normalized to the peak spectral density in that: direction.
The bounds shall apply to a single carrier and shall be
centred at the carrier frequency. The lower bound shall not
apply when the AES is transmitting the unmodulated preamble
at the beginning of a burst.
4.3 -2.1 From-aircrafr. The power spectrum radiated by
the AES shall fall within the mask defined by Table 4-5.
4.3.2.2 To-aircraft. The power spectrum received by the
AES shall be within the mask defined by Table 4-6 for
A-BPSK and Table 4-7 for A-QPSK.
4.3.3 DemoduIator performance. Where the channel
rates are implemented as defined in 4.1, the bit error rate
(BER) performance of the channel demodulators after
descrambling shall be equal to or better than that shown in
Table 4-8. This performance shall be attained under the
following conditions:
a) in the presence of two adjacent interfering carriers on
either side of the wanted carrier at a level of 5 dB
higher than the wanted carrier with a frequency
uncertainty from the nominal carrier spacing as
specified and for the AES demodulator, with the AES
operating up to its maximum allowable operating
E m ,
b) while receiving a signal transmitted with the maximum
phase noise characteristics described in 4.2.3.5.9;
C) during 12" RF phase discontinuities occurring at the
rate of one per second; and
d) under Rician channel conditions for fading bandwidths
of 20, 60 and 100 Hz with a carrier to multipath ratio
of 7 dB for systems using a low gain antenna or low
and high gain antennas; or 10 dB for systems using
only a high gain antenna.
4.3.4 Acquisition performance
4.3.4.1 Time to acquire superj?urne synchronizution. The
period from the command to the antenna to acquire the satellite
to superframe synchronization shall not exceed 16 seconds.
Note.- This assumes the AES is within the satellite service
urea of that P channel.
4.3.4.2 Recommendation.- The period from rhe
command to the antenna to acquire the satellite to supe$rume
synchroni~ations hould be as small as possible.
4.3.4.3 C channel AES demodulator acquisirioh. The
probability of failing to achieve frame lock on the first unique
word following the burst preamble shall be less than one in
lo4 at an Es/No of 1.0 dB in a Gaussian channel, including
conditions of 4.3.3 a) and b); and with the maximum burst-toburst
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