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Time scales synchronization for small base distributed radars

Keywords:

I.V. Kryuchkov – Head of department of Scientific Researcher Institute of Radio-Electronic Engineering, Bauman MSTU, teaching assistant of «Radioelectronic systems and devices» chair of BMSTU. E-mail: kryuchkov@bmstu.ru
S.I. Nefedov – Ph.D. (Eng.), Associate Professor, vice director of Scientific Researcher Institute of Radio-Electronic Engineering, Bauman MSTU, Associate Professor of «Radioelectronic systems and devices» chair of BMSTU. E-mail: nefedov@bmstu.ru
A.V. Saponov – Engineer, Scientific Researcher Institute of Radio-Electronic Engineering, Bauman MSTU. E-mail: asaverios@yandex.ru
A.A. Filatov – Junior Researcher Scientist of NII RET BMSTU, teaching assistant of «Radioelectronic systems and devices» chair of BMSTU. E-mail: andrey-rus-sky@yandex.ru


The paper considers the overview of modern synchronization systems for spatially distributed objects. The synchronization accuracy of these systems is limited to tenth – hundredth parts of nanosecond. In this case the highest synchronization accuracy is reached by the using of the two-way transfer method of synchronization signals. The nanosecond synchronization accuracy can be ensured by the using of one-way method in the distributed radars of VHF band. This approach has been used at synchronization system design for distributed radar. The program-algorithmic synchronization method is suggested for hardware simplification. In this case the time scales of transceiver modules are specified by independent crystal oscillators. The time scales are estimated by applying of piecewise-linear approximation. Time scale joining is realized by the resampling of receivable signals in the same time scale. The carried out experiments have shown that the potential time scale joining accuracy amounts approximately (10…20) ns for 1 MHz synchronization channel band using one-way synchronization signal transfer. The estimating error of time scale joining is about 40 ns in case of synchronization signal transfer by wireless channel with multipath propagation.
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