Synchronization of Multiple USRP SDRs for Coherent Receiver Applications
2019 Sixth International Conference on Software Defined Systems (SDS)(2019)
Abstract
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.
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Key words
multiple USRP SDRs,coherent receiver applications,multiple Ettus Research USRP X310 software-defined radios,multichannel coherent receiver,passive radar applications,phase coherence,receiver synchronization,phase-locked,common reference clock,phase ambiguities,phase stability,DoA capabilities
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