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Synchronization of multiple USRP SDRs for coherent receiver applications

Krueckemeier, Markus; Schwartau, Fabian; Monka-Ewe, Carsten; Schoebel, Joerg


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    <dct:description>&lt;p&gt;This paper describes the necessary means to combine&amp;nbsp;multiple Ettus Research USRP X310 software-defined radios&amp;nbsp;to a multichannel coherent receiver for direction-of-arrival (DoA)&amp;nbsp;and passive radar applications. The requirements to combine several&amp;nbsp;software-defined radios to a multichannel coherent receiver&amp;nbsp;are examined in general. In particular the requirement of phase&amp;nbsp;coherence necessitates a closer look on the receiver synchronization,&amp;nbsp;since the straightforward approach of synchronizing&amp;nbsp;the systems with a common reference clock will in most cases&amp;nbsp;lead to phase ambiguities between the channels. The mechanism&amp;nbsp;inducing these phase ambiguities between several systems that&amp;nbsp;are phase-locked to a common reference is discussed in detail.&amp;nbsp;Results regarding the achieved phase stability and a preliminary&amp;nbsp;measurement demonstrating the DoA capabilities of the system&amp;nbsp;are shown.&lt;/p&gt;</dct:description>
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