Safran CORTEX CRT Quantum - IF Receiver in PCM Mode

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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Page 43
3.3.2.3. IF Receiver in PCM Mode
Next table gives the acquisition and tracking Es/No thresholds according to the PLL bandwidth:
PLL BANDWIDTH (% SR)
BPSK WORST
CASE ES/NO (DB)
QPSK WORST
CASE ES/NO (DB)
OQPSK WORST
CASE ES/NO (DB)
0.01
-12
-3
-2
0.03
-8
-1
0
0.1
-7
1
2
0.3
-4
+3
+4
1
0
+5
+7
3
+3
+8
+10
Next table gives the acquisition and tracking Doppler rate threshold for the IF Receiver in direct PCM mode (no
sub-carrier):
DEMODULATION
WORST CASE DOPPLER RATE (HZ/S)
BPSK
Es/N0 > 10 dB: 0.02 x (Bit Rate x PLL Bandwidth)
2
, limited to 150
kHz/s
Es/N0 > 3 dB: 0.015 x (Bit Rate x PLL Bandwidth)
2
, limited to 150
kHz/s
XQPSK
Es/N0 > 10 dB: 0.006 x (Bit Rate x PLL Bandwidth)
2
, limited to 150
kHz/s
Es/N0 > 3 dB: 0.004 x (Bit Rate x PLL Bandwidth)
2
, limited to 150
kHz/s
Note: It must be checked that the programmed acquisition range and the expected maximum Doppler values are
consistent. The higher the acquisition range is, the longer will be the acquisition process.