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The following Quality Factor values should be observed in various noise conditions, in the case of ESA mode,
with a 1 Hz loop bandwidth and an Integration time of 1 s:
One should note that the probability of having an erroneous ambiguity solving is very high when Q ≤ 92.
In fact, if Q < 95, it is recommended to increase the Integration Time on minor tones and, if possible, to reduce
the PLL bandwidth. Indeed, as indicated in the previous table, at a signal-to-noise ratio S/No = 20 dB.Hz, by
setting the Integration Time at 5 s instead of 1 s, the Quality Factor increases from 93 to 97.
The Quality Factor can be < 95 in the case of bad programming too. It is advised to check the programming of:
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
S/N
(dB.Hz)
0
No extra noise
45
35
25
20
20
Minor tones frequencies
Ground Correction
Board Correction
Sequence Timing & Ambiguity Resolution
Maximum Distance.
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It cannot be duplicated or distributed without expressed written consent.
Quality Factor
100
100
98
95
93
97
(Integration time = 5s)
Safran Data Systems
.
Ref.
DTU 100042
Is.Rev.
5.17
Date:
Dec.
03, 2021Sept. 30, 2021
Page 155
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