Safran CORTEX CRT Quantum - 5. MAINTENANCE PROCEDURES

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
© Safran Data Systems
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Page 174
P and Q factors and tone transmission rank for the ESA standard are :
TONE
RANK
(1 =
FIRST)
Q (2)
P (2)
VIRTUAL TONE
FREQUENCY (KHZ)
REAL TONE
FREQUENCY (KHZ)
7 (note 1)
5
1
100.000
100.000
6
25
1
20.000
20.000
5
125
4
4.000
16.000
4
625
21
0.800
16.800
3
3 125
101
0.160
16.160
2
15 625
501
0.032
16.032
1
62 500
2001
0.008
16.008
Table 26: ESA Tone Standard. Tone Definition
Note 1: the major tone is transmitted first but the phase measurements on that tone are performed only after
minor tones transmission.
Note 2: P and Q factors for the ESA standard are « hard-wired » (not programmable).
3.6.8.3. Ranging Sequence
Next figure illustrates the ranging measurement sequence:
Major tone Major tone
2 3 4 5
6
1 7
IT = Integration Time
Ta T IT T IT
Ts
N measurements on the major tone
One measurement every 250 ms
Major tone + minor tones
Figure 79: Ranging Sequence (ESA Standard)
 1. On reception of a ranging request from the Ranging Client, the RAU computes the tone definition
tables (only the first time a ranging request is received for the current RAU configuration). Then, if the
computation is successful, the RAU starts transmitting the major tone. Status Measurement Progress
in the RAU monitoring table starts incrementing.
 2. Ta seconds later, transmission of the first minor tone along with the major tone (T-second set time).
 3. Average phase measurement for the first minor tone. Parameter Integration Time (IT) is
programmable from 250 ms to 500 s in 250-ms steps.