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@INPROCEEDINGS{Bekman:1021642,
      author       = {Bekman, Ilja and Mester, Achim and Roth, Christian and
                      Zimmermann, Egon and Schardt, Georg and Rongen, Heinz and
                      Heggen, Johannes and Wüstner, Peter and Heil, Roger and van
                      Waasen, Stefan},
      title        = {{C}lock synchronization for a multidevice data acquisition
                      system of a ground penetrating radar},
      school       = {FZJ},
      reportid     = {FZJ-2024-00899},
      year         = {2023},
      abstract     = {As part of the climate research, controlled environment
                      facilities are deepening the knowledge of highly
                      heterogeneous dynamic ecosystems centered around plants.In
                      the context of climate change, it becomes even more
                      important to study the impact of climate conditions on crops
                      under realistic conditions using large scale laboratories.We
                      develop a high resolution multi-channel ground penetrating
                      radar (GPR) for a cylindrical lysimeter that is 1 m wide and
                      1.5 m tall. The GPR data is used to reconstruct a
                      tomographic image of the soil and root system.The GPR
                      design, production and commissioning is performed by the
                      Central Institute of Engineering, Electronics and Analytics
                      - Electronic Systems (ZEA-2) of the Forschungszentrum
                      Juelich in Germany.The system is designed with 39 data
                      acquisition (DAQ) units, one unit controls 64 radio
                      frequency antennas and internally called the Baseboard
                      (BAB), and a Master Module (MAM) used to concentrate the
                      data and control the BABs.Prerequisite for a precise
                      tomogram is an accurate synchronization of all data
                      acquisition components and low-jitter clocking.Each BAB is
                      equipped with the necessary clocking distribution, a Xilinx
                      RFSoC providing the DAC and ADCs, and a separate antenna
                      multiplexing FPGA.The layout of the lysimeter is such that
                      the MAM is connected to 13 BABs arranged in a ring on the
                      lowest layer, and each of these is connected to two
                      additional BABs surrounding higher layers of the
                      lysimeter.This combination of a star and chain topography
                      provides a challenge for the clock synchronization and is
                      discussed in this talk.The analysis of the first
                      verification data is shown and the DAQ roadmap is outlined.},
      month         = {Apr},
      date          = {2023-04-17},
      organization  = {Jährliche Tagung der Studiengruppe
                       ELEKTRONISCHE INSTRUMENTIERUNG 2023,
                       Karlsruhe (Germany), 17 Apr 2023 - 19
                       Apr 2023},
      subtyp        = {After Call},
      cin          = {ZEA-2},
      cid          = {I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)6},
      doi          = {10.34734/FZJ-2024-00899},
      url          = {https://juser.fz-juelich.de/record/1021642},
}