Diversity Combining Unit And Antenna Combining; Data Processing Unit; Frame Synchronization; Data Time-Tagging - Safran CORTEX Series User Manual

1.6.2

Diversity Combining Unit and Antenna Combining

The Cortex HDR allows to combine two IF signals from different polarizations and from different delay.
Two combining modes are available:
- Automatic selection of the best channel
Combining of the two channels, through optimal weighting. In this case up to 3 dB gain can be
-
achieved when both signals have the same Eb/No (and/or same G/T for 2 antennas)
The combining system, also named Diversity Combining Unit (DCU), receives the data from two
demodulators. It resolves phase ambiguity and delay between both channels, and deals with the
different locking states possible. Its output feeds a FEC device, followed by a Format Output.
1.6.3

Data Processing Unit

1.6.3.1

Frame Synchronization

Synchronization word size
Frame size
Synchronization strategy
Automatic ambiguity resolution with feed-back on I & Q digital outputs
1.6.3.2

Data Time-tagging

Time code input
Default time-tag format
Time tagging accuracy
1.6.3.3

CRC Frame checking

Polynomial
Preset value
© Safran Data Systems – IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL
8, 16, 24, 32, 40, 48, 56, 64 or 128 bits
16 to 1048576 bytes
Error threshold on the synchronization word: SYN = 0 to 15 errors
Check to Lock threshold: CTL = 0 to 15 frames
Lock to Search threshold: LTS = 0 to 15 frames
Bit slippage (0, 1 or 2 bits)
IRIG-B or External NTP server
64 bits (second of the year + s of the current second)
 50 s (IRIG B)
Programmable on 16 bits (CCITT compliant)
Programmable on 16 bits
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It cannot be duplicated or distributed without expressed written consent.
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
Safran Data Systems
.
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