COMMAND RANGING & TELEMETRY UNIT CORTEX
Is.Rev.
Date:
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Page 32
1.6.7.
Telemetry Simulation
Simulated telemetry data source Simulated telemetry files (TMS in File mode)
Stored telemetry files (TMS in Replay mode)
Data received on the LAN (TMS in LAN mode)
Pseudo Random Bit Sequence (TMS in Pseudo mode)
PRBS polynomial & length
X
15
+ X + 1.32767 bits.
Output
BPSK, BPSK SQUARE, PCM/PM, PCM/FM or direct PCM
SCF
40 Hz to 128 kHz (low bandwidth), 40 Hz to 512 kHz (LBW extension)
5 kHz to 2 MHz (high bandwidth, with sub-carrier)
Bit Rate
10 bps to 19 kbps (low bandwidth setting), 64 kbps (with LBW extension)
7 bps to 19 kbps with PACK-EXT License, 64 kbps (with LBW extension)
1 to 600 kbps (high bandwidth, sub-carrier)
1 kbps to 20 Mbps (high bandwidth, direct PCM) and 40 Mbit/s in case
of use of Viterbi ½ and 100k - 25Mbit/s in case of Tcm decoding
PCM coding
NRZ-L/M/S, BP-L/M/S, DBP-M/S, DM-M/S, V35
BPSK modulation
ON or OFF
Polarity of transmitted NRZ-L
Normal or inverted
SCF and BR stability
As per the reference clock (external or internal)
File size
32768 bytes (File mode). No limitation (Replay mode)
Automatic BER calculation
Yes (TMS in Pseudo mode)
1.6.8.
Doppler Compensation
1.6.8.1.
Carrier, Sub-Carrier and Bit Rate
Availability
CRT XL Quantum : uplink only, licence dependant
CRT eXplorer : uplink and downlink
Doppler compensation range
± 4 MHz
Doppler compensation rate
3 mHz/s to 52 kHz/s
Doppler compensation sampling 1 s, 0.1 s, 0.01 s and 0.001 s
Doppler compensation step
NCO refreshed every 160 µs, 16 µs, 1.6 µs and 0.16 µs
