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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3.6.12.5.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):
RAU PLL bandwidth = 1 to 32 Hz:
RAU PLL bandwidth < 1 Hz:
where
: Onboard acquisition time (ms) is the time between the reception of the uplink signal and the
regeneration of the downlink signal by the onboard receiver.
1. Note: Set time values are rounded up to the nearest whole number of resolution steps (resolution step ≈ 13.1
ms).
2. RAU Integration Time:
The integration time is programmable from 0.25 s to 1000 s. The next table gives the normalized correlation time
of the 6th PN component:
NORMALIZED CORRELATION TIME
COR
Jet Propulsion Laboratory PN Code
Balanced Weigthed-voting Tausworthe, Code Length = 4
Balanced Weigthed-voting Tausworthe, Code Length = 2
Table 29: CCSDS recommendation for Integration time
For a given acquisition probability PeL of the code and for a given S/N0, the integration time IT is:
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