Safran CORTEX CRT Quantum - ANNEX 2. MAIN SIGNAL PROCESSING BOARD

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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Page 183
Thus N shall be chosen such as the two-way expected delay be lower than T.
3.6.11.4.Tone & Code Set Time
The code set time (T) is defined by the above formula. The tone set time is computed according to the following
formulas (see next figure, parameters T, Ta and Ts) (in seconds):
RAU PLL bandwidth = 1 to 8 Hz:
 
 
RAU PLL bandwidth < 1 Hz:






Note: Set time values are rounded up to the nearest whole number of resolution steps (resolution step ≈ 13.1 ms).
3.6.11.5.Ranging Sequence
Next figure illustrates the ranging measurement sequence with N = 6 or 7:
Pure tone
Pure tone
Pure tone
2
3
4
5
6
1
7
Ta
T
IT
Ts
N measurements on the pure tone
One measurement every 250 ms
tone modulated by codes
T
IT
T
IT
T
IT
Figure 82: Ranging Sequence (ESA Code Standard with N = 7)