Safran CORTEX CRT Quantum - Sequence Timing & Ambiguity Solving; ESA, ESA-Like and USB Tone Standards

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 167
3.6.4.7. Sequence Timing & Ambiguity Solving
3.6.4.7.1. ESA, ESA-like and USB Tone Standards
Configuration parameters:
 Sequence timing & ambiguity solving,
 Minimum satellite-to-earth distance,
 Maximum satellite-to-earth distance,
Allow accurate adjustment of the ranging sequence duration and a more efficient ambiguity solving for the ESA
and ESA-like tone standards.
Parameter Sequence Timing & Ambiguity Resolution is for selecting any of the following scenarios
(parameters T, Ta and Ts: see Figure 75):
 Scenario 1 (select All Fixed):
The major tone set time depends on the selected RAU PLL bandwidth (parameter PLL
Bandwidth). The minor tone set time is fixed:
Major tone: PLL bandwidth (2Bn) = 1 to 8 Hz: Ta = Ts = 2 (in seconds)
PLL bandwidth (2Bn) < 1 Hz: Ta = Ts =


(in seconds)
Example: if the PLL bandwidth is set to 0.4 Hz, Ta = Ts = 5 seconds
Minor tones: T = 0.5 (in second)
Ambiguity solving (distance computation) is performed in the range 0 to the wavelength of the
lowest virtual minor tone. Do not use this setting in case of non-integer ratio between minor tone «
Q » factors.
 Scenario 2 (select Fixed seq.):
Set times for the major and minor tones are as per scenario 1.
Ambiguity solving (distance computation) is performed over the distance range specified by the
Operator. Use this setting in case of non-integer ratio between minor tone « Q » factors.