曝光台 注意防骗
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high gain antenna.
4.3.4 Acquisition performance
4.3.4.1 Time to acquire supetframe synchronization. The
period from the command to the antenna to acquire the
satellite to superframe synchronization shall not exceed 16
seconds.
Note.- This assumes rhe AES is within the satellite service
area of that P channel.
4.3.4.2 Recommendation.- The period from the
com,mnd to the antenna to acquire the satellite to superframe
synchronization should be as small as possible.
4.3.4.3 C CHANNEL AES DEMODULATOR ACQUISITION
4.3.4.3.1 &A~WEL RATE OF 21.0 K B I T ~ S
4.3.4.3.1.1 Frame lock. The probability of failing lo
achieve frame lock on the first unique word following the burst
preamble shall be less than one in lo4 at an Es/No of 1.2 dB
in a Gaussian channel, including conditions of 4.3.3 a) and b),
and with a maximum burst-to-burst frequency uncertainty of
*30 Hz and maximum channel rate accuracy deviation of
4.4.5.1.
4.3.4.3.1.2 False frame lock. The probability of false
frame lock shall be less than one in 1@ for an EJNo of 0 dB
in a Gaussian channel, including conditions of 4.3.3 a) and b),
and with a maximum burst-to-burst frequency uncertainty of
k30 Hz and maximum channel rate accuracy deviation
of 4.4.5.1.
4.3.4.3.1.3 Reacquisition of frame lock. Upon the loss of
frame lock, it shalI be acquired within 3.0 seconds for 99 per
cent of the time, at an Es/No of 0 dB in a Gaussian channel,
including conditions of 4.3.3 aj and b), and with a maximum
burst-to-burst frequency uncertainty of k30 Hz and maximum
channel rate accuracy deviation of 4.4.5.1.
4.3.4.3.2 CHANNEL MTE OF 8.4 K B I T S ~
4.3.4.3.2.1 Frame lock. The probability of failing to
achieve frame lock on the first unique word shall be less than
one in lo3 a1 an Es/No of 4.1 dB in a Gaussian channel,
including conditions of 4.3.3 a) and b), and with a maximum
burst-to-burst frequency uncertainty of e30 Hz and maximum
channel rate accuracy deviation of 4.4.5.1.
4.3.4.3.2.2 False frame lock. The probability of false
frame lock shall be less than one in I@ for an E,/No of 4.1 dB
in a Gaussian channel, including conditions of 4.3.3 a) and b),
and with a maximum burst-to-burst frequency uncertainty of
+30 Hz and maximum channel rate accuracy deviation of
4.4.5.1.
4.3.4.3.2.3 Reacguisitiorz of frame lock. Upon the loss of
frame lock, it shall be acquired within 0.5 seconds at an E&No
of 4.1 dB, in 90 per cent of all cases, i11 a Gaussian channel,
including conditions of 4.3.3 a) and b), and with a maximum
burst-to-burst frequency uncertainty of e30 Hz and maximum
channel rate accuracy deviation of 4.4.5.1.
4.3.4.4 C CHANNEL GES
DEMODULATOR ACQUISITION
4.3.4.4.1 Channel rate of 21.0 kbits/s. In a Gaussian
channel, and under the conditions of 4.3.3 a) and b), with a
frequency offset of e600 Hz, and a clock frequency offset of
k0.5 Hz, the probability of failing to achieve frame lock on the
first unique word shall be less than 1 .in lo3 at an EJNo of
1.7 dB. The probability of false frame lock shall be less than
1 jn 105 at an Es/No of 1.7 dB. Should frame lmk be lost, it
shall be reacquired within 3.0 seconds, for 99 per cent of the
time, at an EJNO of 1.7 dB.
4.3.4.4.1 bis Channel rate of 8.4 kbirs/s. In a Gaussian
channel, and under the conditions of 4.3.3 a) and b), with a
frequency offset of +600 Hz, and a clock frequency offset of
d . 5 Hz, the probability of failing to achieve frame lock on the
first unique word shall be less than 1 in lo3 at an Es/NO of
4.4 dB. The probability of false frame lock shall be less than
1 in lo4 at an Es/No of 4.4 dB. Should frame lock be lost, it
shall be reacquired within 0.5 seconds, 90 per cent of the time,
at an E,/No of 4.4 dB.
4.3.4.4.2 Other C channel rates. The probability of the
GES demodulator failing to achieve frame lock within 0.75
seconds of the start of C channel transmission shall be less
than one i11 lo2.
2111laO
No. 75
Part d Annex 10 - Aeronautical Telecommunications
4.3.4.4.3 Recommendation.- The GES demodulator 4.4.2.2.3 Superframe boundary marker: This field shall
should achieve C channel frame lock as soon as possible afrer consist of 12 bits.
the start of C channel transmission.
- 4 bits to indicate the start of a new superframe
11 11 for frame 0 in a superframe of 8 seconds
0000 for all remaining frames in the superframe
4.4 CHANNEL FORMAT TYPES - 4 bits to indicate frame of superframe
AND RATES 0000,0001,0010,001 1 at 0.6 kbitsls
0000,0001 ,...., 01 11 at 1.2 kbitsls
0000,0001 ,...., 11 11 at 2.4 kbits/s and above
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