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Integration of phase-stable system of ADC of distributed reception channels in an aircraft radio frequency interferometer system using elements of microwave photonics

DOI 10.18127/j00338486-201811-18

Keywords:

A.A. Emelyanov – Design Engineer of the 2nd category, JSC «Kaluga Scientific Research Radio Engineering Institute»


High-accuracy measurement of RF source coordinates is one of fundamental requirements to modern digital RF interferometers in aircraft systems of radio monitoring, in which one of the basic measured parameters is phase difference of signals received and digitized by distributed reception channels. Accordingly, minimization of errors in digitization of signals received by such channels is one of basic requirements to radio frequency interferometers.
The objective of this work is to minimize phase-difference errors in digitization of received signals by analog-digital converters (ADC) of distributed channels of an RF interferometer by using fiber-optic communication lines (FOCL) in the ADC clock frequency distribution system.
The special feature of the suggested system of phase synchronization of all ADSc and signal processors of the radio frequency inter-ferometer is utilization of a single high-stable source of clock signals that are distributed among all ADCs through single-mode fiber-optic communication lines (FOCL) of equal electrical length; the clock frequency signals of the ADCs in field programmable logic devices (FPLD) of signal processing are transmitted through a single fiber optic on different-frequency optical carriers.

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May 29, 2020

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