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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It cannot be duplicated or distributed without expressed written consent.
The architecture of one elemantary combiner bloc, Polarization or Frequency, is given in the schema below.
Each elementary combiner bloc is in charge of:
Aligning the phases of the two input channels,
Weighting them according to their respective levels.
The output of the elementary combiner bloc is settable to: Channel A, Channel B or Combined.
The processing involved here are basically the same as the ones of the legacy predetection diversity combiner.
A second order PLL is used for phase alignement of the 2 channels. The combiner weights are computed from
the IF levels of the channels. The IF levels are measured at the outputs of the predetection filters.
Remark: When used for frequency combination, in case the 2 input channels are the outputs of the
polarization combiners, the base-band transposition and the filtering blocs are by-passed.
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