Other Status & Alarms - Safran CORTEX Series User Manual

4.5.4.1.2.2 Other Status & Alarms
IF LEVEL
CARRIER OFFSET
BR OFFSET
OR
SR OFFSET
EB/NO
OR
ES/NO
In OQPSK mode, the following additional status appears at the GUI for monitoring the I/Q delay
compensation:
I/Q SHIFT
Note 1: The I/Q shift compensation applies to Q channel (after IF to base-band down-conversion). As
the OQPSK demodulation is ambiguous, the sign of the status changes in accordance with the
demodulation ambiguity.
Note 2: In fixed mode, as the demodulation is ambiguous, both signs are tested and an error
estimation is done in both cases. If the best error value is inferior to a certain threshold, the automate
will be locked on this sign. If the two errors are not acceptable (i.e. if the programmed compensation
does not reflect the real delay), the automate will indefinitely change the sign of the compensation,
which is reflected by the sign change of this status. In this unstable configuration, the I/Q shift value
must be refined.
Important: in UQPSK (AQPSK, AUQPSK, AUSQPSK) mode, status BR OFFSET, Eb/No and BIT
SYNC described here above are for the I Channel. The following additional status appears at the GUI
for monitoring the Q Channel:
BR OFFSET Q
Eb/No Q
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IF carrier level in dBm. The nominal AGC range is from -10 to -50 dBm.
Degraded measurement if the level of the received signal is not within these limits.
Offset from the expected IF carrier frequency (real frequency - expected
frequency). Expressed in Hz. This value depends both on the oscillator drift (on-
board and ground equipment) and on the Doppler conditions.
Offset from the expected bit rate (real BR - expected BR). Expressed in bit per
second.
In DVB-S2 and SCCC modes, the Bit Rate Offset is replaced by the Symbol
Rate Offset
Energy per bit in a 1-Hz noise bandwidth, measured at the bit synchronizer input.
Expressed in dB.
In DVB-S2 and SCCC modes, the Eb/No is replaced by the Es/No (Es: Energy
per symbol
When OQPSK I/Q delay compensation is:
 OFF
 ON (Auto)
Detected compensation value (Note 1)
 ON (Fixed)
Fixed compensation value (Note 1 and 2)
Offset from the expected bit rate for the Q Channel (real Q Channel BR –
expected Q Channel BR). Expressed in bit per second.
Energy per bit in a 1-Hz noise bandwidth, measured at the bit synchronizer input
for the Q Channel. Expressed in dB.
It cannot be duplicated or distributed without expressed written consent.
Ref. DTU 100782
Is.Rev
Date:
No compensation
Safran Data Systems
This document is the property of
3.5
June 1, 2021
.
Page 267