Sources Of The Data To Replay; Multi-Dpu Processing; Generality - Safran CORTEX Series User Manual

3.4.12.2

Sources of the data to replay

The data to be replayed can be provided from files coming from different sources:
 Recorded data by the Cortex HDR itself during a pass of a satellite (Report TM mode)
 Files containing User data
 PRN data or data from simulation files (BER analysis)
In the first case, all the data contained inside files recorded during a pass of a satellite and
corresponding to a report are replayed in the chronological order. It is also possible to select only one
specific file of a selected report.
In the second mode (User Data), in order to be easily selected from the Playback Window, the data
files must be written in a sub-directory called "PLAYBACK" in a selected recording partition (example:
TMA, TMB,... refer to the recording section). The files can be written directly in this directory, then it is
necessary to change their names by 1, 2, 3 .... or inside sub-directories , in this second case the
names of the subdirectories have to be named: 1, 2, 3...The format of the User files must be
compatible with the standard HDR files, i.e. binary files.
During the playback, the recording function can be used simultaneously.
3.4.13

Multi-DPU processing

3.4.13.1

Generality

The Cortex HDR provides the multi-DPU (Data Processing Unit) capabilities.
The multi-DPU capabilities (4 DPU or 8 DPU) are license dependent.
The multi-DPU functionalities are implemented inside a specific demodulator menu (menu 52) and a
specific test modulator menu (menu 5), which can be configured by parameters setting.
Basically this menu supports the following configurations described in the following figures:
One channel QPSK demodulation with 2 DPU connected to the demodulator outputs (DPU A
-
and DPU C)
One channel QPSK or 16QAM demodulation with 4 DPU connected to the demodulator outputs
-
(DPU A, DPU C, DPU E and DPU G)
- One channel 16QAM demodulation with 8 DPU connected to the demodulator outputs (DPU A,
DPU B, DPU C, DPU D, DPU E, DPU F, DPU G and DPU H)
- One channel QPSK or 16QAM demodulation with 1 DPU (DPU A) connected to the
demodulator merged output, essentially used for BER measurement purpose
For each configuration, the input is done at 720 MHz IF level, the demodulated and processed data at
the output of each DPU can be recorded inside the internal hard disks of the unit. The data can be
recovered using FTP.
For each possible configuration, the test modulator can provide:
- the symmetrical functions as described in the following figures
or a single data channel test modulation as described in the last figure
-
The differential decoding is a NRZ-M to NRZ-L decoding
© Safran Data Systems – IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL
This document is the property of
It cannot be duplicated or distributed without expressed written consent.
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
Safran Data Systems
.
Page 139