Safran CORTEX CRT Quantum - Page 49

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 24
1.6.1.4.2. High Bandwidth Telemetry with Sub-carrier
 Input IF Receiver output or Auxiliary input
 Demodulation BPSK, PCM/PM (direct bit synchronization available)
Option: PCM/FM capability (discriminator filter available)
 Sub-Carrier Frequency 5 kHz to 2 MHz
 Bit Rate 1000 bps to 600 kbps (up to 300 kbps for BP-L code)
1000 bps to 5 Mbps PM/PCM, 1000 bps to 15 Mbps FM/PCM (after
decoding. License-dependant. See § 3.3.1.1 )
 Bandwidth Automatically adjusted to the selected bit rate and sub-carrier frequency
 PSK Demodulator & Bit Synchronizer PLL BW (CRT XL Quantum)
3%, 1%, 0.3% or 0.1% of BR
 PSK Demodulator & Bit Synchronizer PLL BW (CRT eXplorer)
10%, 3%, 1%, 0.3%, 0.1% ,0.03% or 0.01% of BR
 Bit Sync. acquisition range ± 4 × PLL BW if the PLL BW is set to 0.1 or 0.3 % of BR
± 2 × PLL BW if the PLL BW is set to 1 or 3 % of BR
 Acquisition threshold (CRT XL Quantum)
Eb/No ≤ 0 dB
- 2 dB for direct NRZ bit sync. (narrowest BW) for symbol rate ≥ 1 ksps
10 dB for symbol rates < 1 ksps at 100 sps
 Acquisition threshold (CRT eXplorer)
Eb/No ≤ -8 dB for 0.03% and Symbol rates > 10 ksps
- 2 dB for direct NRZ bit sync. (narrowest BW) for symbol rate ≥ 1 ksps
10 dB for symbol rates < 1 ksps
 Viterbi decoding Rate 1/2 according to CCSDS 131.0-B-3 (§ 3.3) and 1/3
Constraint length 7.
 Viterbi depuncturing Rate 2/3, 3/4, 5/6, 7/8 according to CCSDS 131.0-B-3 (§ 3.4)
From 1/2 rate punctured code. Constraint length 7.
 PCM decoding NRZ-L/M/S, BP-L/M/S, DBP-M/S, DM-M/S and R-NRZ
 BER degradation vs theory ≤ 1 dB if BR < 10 Mbps,
≤ 2 dB if BR < 20 Mbps
≤ 1 dB if BR < 5 Mbps (BP or DM codes)
≤ 2 dB if BR < 10 Mbps (BP or DM codes)
 Direct Bit Sync. acquisition time ≤ 150 bits if Bit Sync. Loop BW = 0.1 or 0.3 % of BR
≤ 100 bits if Bit Sync. Loop BW = 1 or 3 % of BR
 Eb/No measurement Yes