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Table 6-9. TDRSS SSA Return Service (cont’d)
Parameter (Note 7) Description (Note 7)
10 -5 Bit Error Rate (notes 1, 2, 3, 8) (cont’d):
Minimum Required P rec for Rate 1/3
convolutional coding (cont’d):
DG2
Acquisition (notes 3, 8):
Data rate < 1 Mbps -232.4 + 10log 10 (data rate in bps)
Data rate > 1 Mbps -231.6 + 10log 10 (data rate in bps)
Orbital dynamics Free-flight dynamics only (defined in Table 6-10)
Total Channel Acquisition Time (assumes
the customer return service signal is
present at the SN ground terminal at the
start time of the return service support
period)
PN Code (if applicable) and Carrier
Acquisition:
Sum of the following:
1. PN (DG1 only) and carrier acquisition time
2. Symbol/Decoder synchronization time
or
Symbol/Deinterleaver/Decoder
synchronization time (if deinterleaving is
applicable)
Prec > -202.9 dBW or consistent with the Prec for BER,
whichever is greater
Acquisition Time (Pacq > 90%):
Coherent operations < 1 sec
Noncoherent operations with
frequency uncertainty (note 5):
< + 700 Hz < 1 sec
< + 3 kHz < 3 sec
< + 35 kHz < 3 sec
Channel Decoder/Symbol Synchronization
Acquisition (note 6):
Minimum data bit transition density > 64 randomly distributed data bit transitions within
any sequence of 512 data bits
Number of consecutive data bits
without a transition
< 64
Prec (dBW) consistent with the Prec for BER
Revision 10 6-29 450-SNUG