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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 4, pp. 24-32

Synchronization of dispersed radio-electronic devices on GNSS signals using SDR technologies

S.V. Litvinov 1 , Yu.A. Polevoda 1 , E.A. Chistyakov 1 , G.V. Konyashkin 1 
1 MIREA — Russian Technological University, Moscow, Russia
Accepted: 01.07.2024
DOI: 10.21046/2070-7401-2024-21-4-24-32
The work demonstrates the developed system of synchronizing signals generation using signals of global navigation satellite systems (GNSS). As a receiver of GNSS signals the SDR receiver HackRF One is used, built on the technology of Software-Defined Radio (SDR). Software configuration of HackRF One provides reception and processing of GLONASS signals and formation of synchronization signals at the output: the signal of the second marker 1 Hz (1 PPS — pulse per second) and the reference frequency signal 10 MHz. In addition, data on the coordinates of the place and time codes tied to the world system are formed. A version of the construction of the shaper clock frequencies (from 96 to 250 MHz) using SDR receiver as a reference oscillator is proposed. Such a shaper is an indirect synthesis circuit based on a system of phase frequency autotuning with a frequency divider in the feedback circuit. This means that the reference voltage of the digital-to-analog converter (DAC) is formed from the reference voltage of the quartz oscillator. Stability of the output signal frequency is provided by the scheme of stabilization of the supply voltage of the reference oscillator and DAC, as well as the use of a buffer decoupling amplifier to reduce the load influence of 10 MHz signal consumers.
Keywords: synchronization, reference frequency, second marker, global navigation satellite systems, GNSS, GLONASS, SDR technologies
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