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Annex I0 - Aeronnatical Telecommunications
Table A-3. Q-precedence structure for AMSS transmissions
AMSS
Q-number Function
15 Distress/urgency voice; signalling
14 Distresdurgency data messages
13 Reserved for signalling
12 Flight safety voice; signalling
11 Flight safety data messages; communications related to
direction finding
10 Meteorological and flight regularity voice; signalling
9 Reserved for signalling
8 Meteorological data messages
7 Flight regularity data messages
6 Aeronautical Information Service Messages
5 Aeronautical administrative data messages, networklsystems
administrative data messages
4 Routine cockpit and cabin voice; signalling
3-0 Various AAC and APC categories; other
Table A-4, Frequency error budget for receiving the P channel
Specification Standard deviation
GES transmit reference error &lo0 Hz 57.7 Hz
AFC pilot transmit error *lo0 Hz
GES AFC error k100 Hz
AES receive reference error 4155 Hz 89.5 Hz
Oscillator related errors at AES
- standard deviation
- 99 per cent contour
NOTES:
1. It is assumed that oscillator specifications define a uniform error distribution.
2. The contribution of a number of oscillators to the overall error is estimated using a rootsum-
square calculation.
Attachment A to Part I Annex Id - Asronuuti cal TelscommunicaRaRons
Table A-5, AES-to-GES frequency error budget with a P channel reference
Specification Standard deviation
(Hz) (Hz)
AES receive reference mr x 1.07' 107
AES uansmitlreceive reference error (1 65 + 155) = 320 184.8
AES AFC error 100 57.5
AFC pilot transmit frequency em? 7 5 43.3
GE;S AFC e d 100 57.7
Fqueacy enor at GES demodulator
- standard deviation
- 99 per cent contou3
1. This is the total of the first three contributors to frequency error for the P channel. The factor of 1.07
is the approximate ratio of the transmit and receive frequencies.
2, The combination of the GES AFC error and the AFC pilot transmit error produce the frequency error
of the satellite translation oscillators on the return link.
3. This is the GES demodulator specification.
able A-6. Typical C channel carrier-to-ndse densities required
Elevation angle to the satellite (degrees)
Objective FEC decoder output BER
AES minimum antenna gain (dB)
Carrierirnultipath ratio (dB)
Multipath fading bandwidth (Hz)
FEC coding rate
Modulation method
Theoretical required EJN, (dB)
Modem implementation loss (dB)
Imperfect interleaving loss (dB)
Adjacent channel interference loss (dB)
Modem EJN, (dB) required
To-aircraft link C channels
(voice)
REQUIRED ClN, (dBHz)
21.0 kbitsls
From-aircraft link C channels
(voice)
12
10
20 to 100
'/2
A-QPSK
1.2
1.1
3.0
0.1
5.4
A-QPSK A-QPSK A-QPSK
Annex 10 - Aerom&*cal Telecommunications Vohme III
mble A-7. Typical P channel carrier-to-noise densities required
Elevation angle to the satellite (degrees)
Objective FEC decoder output BER
AES minimum antenna gain (dB)
Carrier/multipath ratio (dB)
Multipath fading bandwidth (Hz)
FEC coding rate
Modulation method
Theoretical required EP, (dB)
Modem implementation loss (dB)
Imperfect interleaving loss (dB)
Adjacent channel interference loss ( d ~ ) '
Modem EJN, (dB) required
To-aircraft link P channels
(low rate data)
5
1 o5
0
7
20 to 100
H
A-BPSK
5.0
1.2
1.0
0. I
7.3
To-aircrafi link P channel
(high rate data)
20
1 o5
0
12
20 to 100
V2
A-BPSK
3.5
1.1
0.5
0.1
5.2
5
I 0-5
12
10
20 to 100
4'2
A-QPSK
2.8
1.5
1 .o
0.1
5.4
REQUIRED CIN, (dBHz)
0.6 kbits/s
NOTES:
20
I o - ~
12
12
20 to 100
?h
A-QPSK
2.4
1.1
0.5
0.1
4.1
1. The adjacent channel interference loss is a function of channel spacing. The example losses a~ef:o r channel rates of 2.4 and 10.5
kbitsis, for A-BPSK and A-QPSK. respectively. The losses should be no greater for the other channel rates because the channel
spacing, relative to the channel rate, will be larger.
2. The low data rates (A-BPSK) can also be used with high gain antennas with potentially less C/N, required.
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