Safran CORTEX CRT Quantum User Manual page 47

1.6.1.3. Direct PCM Demodulation
1.6.1.3.1. IF Demodulation

Demodulation

Input carrier frequency

Carrier acquisition range

Carrier acquisition modes

Demodulation IF bandwidth

Unbalanced QPSK

Acquisition threshold (CRT XL Quantum)

Acquisition threshold (CRT eXplorer)

Doppler measurement

IF level measurement accuracy < 2 dB

Diversity combining

Spectrum analysis

Adaptive blind equalization (license dependent)
1.6.1.3.2. Bit Synchronization and Decoding

PCM decoding

Viterbi decoding

Viterbi depuncturing

Tcm decoding

Bit rate

QPSK ambiguities solving

Matched filter

Roll-off factor
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
PCM/PM, BPSK, QPSK, OQPSK, SOQPSK, GMSK, AQPSK, UQPSK,
8PSK
60 to 78 MHz
± 10 to ± 500 kHz
see Section 3.3.2.1
Automatically adjusted in accordance to the selected bit rate
Up to 20 dB unbalance
Eb/No ≤ 0 dB for symbol rates ≥ 1 ksps
IF level ≥ -85 dBm
Eb/No ≤ -8 dB or –5 for QPSK modes with 0.01 % PLL BW,
for symbol rates ≥ 10 ksps, IF level ≥ -85 dBm
IF offsets and cumulated phase variations (integrated Doppler)
Pre-detection or post-detection combining (optional)
Up to 3-dB gain with equal-strength signals
Yes (spectrum analysis and IF demodulation are mutually exclusive)
NRZ-L/M/S, BP-L/M/S, DBP-M/S, DM-M/S, R-NRZ and V35
Rate 1/2 CCSDS 131.0-B-3 (§ 3.3) and 1/3 - Constraint length 7.
Rate 2/3, 3/4, 5/6, 7/8 CCSDS 131.0-B-3 (§ 3.4)
From 1/2 rate punctured code. Constraint length 7.
Rate 2.00/3, 2.25/3, 2.50/3, 2.75/3.
100 bps to 20 Mbps (after decoding. License- dependent. See § 3.3.1.2)
- By the frame synchronizer (Synchronization word detection phase)
- Single or dual input Viterbi decoding
- Separate Viterbi decoding on I and Q channels
- Differential QPSK decoding (DQPSK, DOQPSK, DSOQPSK)
See section 3.3.7 for more details
Integral & Dump, Raised Cosine or Root Raised Cosine
0.1 to 1
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Ref. DTU 100042
Is.Rev. 5.17
Date: Dec. 03, 2021Sept.
30, 2021
Page 22