Esa Code Standard - Safran CORTEX CRT Quantum User Manual

 Scenario 3 (select Fixed amb.):
The set time for the major and minor tones depends on two factors:


PLL bandwidth (2Bn) = 1 to 8 Hz:
Ta = Ts = 2 +
PLL bandwidth (2Bn) < 1 Hz:
Ta = Ts =
2��
T =
where d is the programmed maximum satellite-to-earth distance and c is the light speed (3 x 10
m/s). Values are rounded up to the nearest whole number of resolution steps (resolution step ≈
13.1 ms).
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 4 (select No fixed):
The set times for the major and minor tones are as per scenario 3. Ambiguity solving is as per
scenario 2. Use this setting in case of non-integer ratio between minor tone "Q" factors.

3.6.4.7.2. ESA Code Standard

The ambiguity distance is given by the code length parameter.
The tone and code set times (sequence timing) are automatically adjusted, depending on the loop bandwidth, the
code length and the tone frequency (see sections 3.6.11.3 to 3.6.11.5).
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
the RAU PLL bandwidth (parameter Loop Bandwidth)
the maximum one-way satellite distance (parameter: Maximum Distance)
2��
(in seconds)
��
2��
T = (in seconds)
��
2 2��
+
(in seconds)
2���� ��
(in seconds)
��
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Safran Data Systems
.
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
8
Page 168