HIGH DATA RATE RECEIVER
HDR-4G+ USER’S MANUAL
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
© Safran Data Systems – IMP000074 e14r1
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Diversity Combining Unit and Antenna Combining 1.6.2
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.
Data Processing Unit 1.6.3
Frame Synchronization 1.6.3.1
Synchronization word size 8, 16, 24, 32, 40, 48, 56, 64 or 128 bits
Frame size 16 to 1048576 bytes
Synchronization strategy 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)
Automatic ambiguity resolution with feed-back on I & Q digital outputs
Data Time-tagging 1.6.3.2
Time code input IRIG-B or External NTP server
Default time-tag format 64 bits (second of the year + s of the current second)
Time tagging accuracy 50 s (IRIG B)
CRC Frame checking 1.6.3.3
Polynomial Programmable on 16 bits (CCITT compliant)
Preset value Programmable on 16 bits
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