Synchronization of Multiple USRP SDRs for Coherent Receiver Applications

This paper describes the necessary means to combine multiple Ettus Research USRP X310 software-defined radios to a multichannel coherent receiver for direction-of-arrival (DoA) and passive radar applications. The requirements to combine several software-defined radios to a multichannel coherent rece...

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Bibliographic Details
Published in2019 Sixth International Conference on Software Defined Systems (SDS) pp. 11 - 16
Main Authors Krueckemeier, Markus, Schwartau, Fabian, Monka-Ewe, Carsten, Technische, Joerg Schoebel
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2019
Subjects
Clocks
Field programmable gate arrays
Phase locked loops
Phase measurement
Receivers
Software
Synchronization
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Summary:This paper describes the necessary means to combine multiple Ettus Research USRP X310 software-defined radios to a multichannel coherent receiver for direction-of-arrival (DoA) and passive radar applications. The requirements to combine several software-defined radios to a multichannel coherent receiver are examined in general. In particular the requirement of phase coherence necessitates a closer look on the receiver synchronization, since the straightforward approach of synchronizing the systems with a common reference clock will in most cases lead to phase ambiguities between the channels. The mechanism inducing these phase ambiguities between several systems that are phase-locked to a common reference is discussed in detail. Results regarding the achieved phase stability and a preliminary measurement demonstrating the DoA capabilities of the system are shown.
DOI:10.1109/SDS.2019.8768634