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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:
1
Pure tone
Ta
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
2
3
T
IT
T
IT
T
tone modulated by codes
Figure 82: Ranging Sequence (ESA Code Standard with N = 7)
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It cannot be duplicated or distributed without expressed written consent.
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T
IT
Ts
Safran Data Systems
.
Ref.
DTU 100042
Is.Rev.
5.17
Date:
Dec.
03, 2021Sept. 30, 2021
6
7
N measurements on the pure tone
One measurement every 250 ms
Pure tone
Pure tone
Page 183
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