Research of the layout of a promising system for synchronization of diversity receiving channels of a radio interferometer using microwave photonics technology

Аuthors

Emelyanov A. A.^*, Unchenko I. V.^**

MIREA — Russian Technological University (Lomonosov Institute of Fine Chemical Technologies), 78, Vernadsky prospect, Moscow, 119454, Russia

*e-mail: nd1794@yandex.ru
**e-mail: unchenkoivan@gmail.com

Abstract

High-precision measurement of the angular coordinates of radio emission sources is the cornerstone task of modern digital radio interferometers. The main measured parameter in these devices is the totality of the phase differences of the signal received and digitized by spaced receiving channels. To achieve high measurement accuracy, it is necessary first to minimize the difference-phase errors in digitizing the received signal by spaced receiving channels. In addition, the placement of radio interferometers at most objects involves solving the problems of minimizing the size of the system, its weight, power consumption and cost. To optimally solve these problems, it is proposed to use fiber-optic communication lines (FOCL) with their own low phase noise, which is based on modulation of laser radiation through electroabsorption.

The purpose of this work is a practical assessment of the degree of influence of the noise characteristics of a fiber-optic link, which is based on the modulation of laser radiation through electroabsorption, on the quality of the synchronization system signal and a comparison of the calculated and measured noise and transmission characteristics of the transmission path of the synchronization system of spaced receiving channels of a fiber-optic interferometer radio interferometer.

The object of study was: a model of the transmission path of the synchronization system (hereinafter referred to as the system). The research was carried out using a calculation-analytical method and through practical measurements using a phase noise analyzer, a network analyzer, and a signal analyzer.

During the work, transmission and noise coefficients for the system were calculated. Taking into account the amplifiers used, the calculated value of the transmission coefficient was no more than 16 dB and no less than 24 dB for the noise figure. According to the measurement results, the transmission coefficient was from 13 to minus 3 dB, and the noise figure was at least 30 dB; the resulting discrepancies are due to the nonlinearity of electro-optical conversion through electroabsorption and the nonlinearity of the photodiode. The introduced phase noise of the synchronization system was measured at frequencies of 1, 5 and 10 GHz. The value of the introduced phase error of the fiber-optic communication line was determined, which was: for 1 and 5 GHz - no more than 0.056 degrees, and for 10 GHz - no more than 0.176 degrees.

Keywords:

radio interferometer, microwave photonics, synchronization, difference-phase errors, laser, jitter

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