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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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  "DOI": "10.1109/SDS.2019.8768634", 
  "language": "eng", 
  "title": "Synchronization of multiple USRP SDRs for coherent receiver applications", 
  "issued": {
    "date-parts": [
  "abstract": "<p>This paper describes the necessary means to combine&nbsp;multiple Ettus Research USRP X310 software-defined radios&nbsp;to a multichannel coherent receiver for direction-of-arrival (DoA)&nbsp;and passive radar applications. The requirements to combine several&nbsp;software-defined radios to a multichannel coherent receiver&nbsp;are examined in general. In particular the requirement of phase&nbsp;coherence necessitates a closer look on the receiver synchronization,&nbsp;since the straightforward approach of synchronizing&nbsp;the systems with a common reference clock will in most cases&nbsp;lead to phase ambiguities between the channels. The mechanism&nbsp;inducing these phase ambiguities between several systems that&nbsp;are phase-locked to a common reference is discussed in detail.&nbsp;Results regarding the achieved phase stability and a preliminary&nbsp;measurement demonstrating the DoA capabilities of the system&nbsp;are shown.</p>", 
  "author": [
      "family": "Krueckemeier, Markus"
      "family": "Schwartau, Fabian"
      "family": "Monka-Ewe, Carsten"
      "family": "Schoebel, Joerg"
  "id": "3522157", 
  "event-place": "Rome, Italy", 
  "type": "article", 
  "event": "2019 Sixth International Conference on Software Defined Systems (SDS)"
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