Ettus USRP and GNU Radio Simon Olvhammar Chalmers University of - - PowerPoint PPT Presentation

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Ettus USRP and GNU Radio Simon Olvhammar Chalmers University of - - PowerPoint PPT Presentation

Mar 22, 2023 316 likes •481 views

Chalmers University of Technology Dicke-Switched microwave radiometry using Ettus USRP and GNU Radio Simon Olvhammar Chalmers University of Technology, Sweden Department of Earth and Space Sciences

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Department of Earth and Space Sciences 1

Chalmers University of Technology

Dicke-Switched microwave radiometry using Ettus USRP and GNU Radio

Simon Olvhammar Chalmers University of Technology, Sweden

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Department of Earth and Space Sciences 2

Chalmers University of Technology

Overview

  • Dicke-switching
  • Aeronomy and Astronomy
  • Software Defined Radio (SDR) platforms

i.e The Ettus Universal Software Radio Peripheral (USRP)

  • GNU Radio
  • A Dicke-Switched Fast Fourier Transform (FFT) back-end
  • Measurements (O3 and CO)
  • Conclusion
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Department of Earth and Space Sciences 3

Chalmers University of Technology

Dicke-Switching

  • Gain, atmospheric fluctuations
  • Robert H. Dicke
  • The Dicke Radiometer
  • Load, sky and frequency switching

Applications

  • Search for ExtraTerrestrial Intelligence (SETI)
  • Interstellar medium
  • Dark Matter/Energy
  • Black holes
  • Atmosphere
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Department of Earth and Space Sciences 4

Chalmers University of Technology

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Department of Earth and Space Sciences 5

Chalmers University of Technology

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Department of Earth and Space Sciences 6

Chalmers University of Technology

New Onsala 3mm band receiver

  • V. Belitsky, I. Lapkin et al
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Department of Earth and Space Sciences 7

Chalmers University of Technology

Software-defined radio (SDR)

  • Implement radio in software
  • Flexible
  • Cost effective
  • Simple
  • The Ettus USRP
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Department of Earth and Space Sciences 8

Chalmers University of Technology

The Ettus USRP architecture

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Department of Earth and Space Sciences 9

Chalmers University of Technology

  • Blocks designed in C++
  • E.g. IIR-filter, FFT-calculations
  • Linked through GRC, Python or

C++

  • Free and open source policy
  • Great community
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Department of Earth and Space Sciences 10

Chalmers University of Technology

A Dicke-switched FFT spectrometer in GNU Radio

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Department of Earth and Space Sciences 11

Chalmers University of Technology

Measurements of frequency-switched O3 and CO using a double side band heterodyne receiver

P.Forkman et al Front-end Back-end

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Department of Earth and Space Sciences 12

Chalmers University of Technology

Frequency-switched measurement of CO at 115.27 GHz and O3 at 110.84 GHz with Ettus USRP and GNU Radio as back-end spectrometer

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Department of Earth and Space Sciences 13

Chalmers University of Technology

Summary and conclusions

  • Cheap, reliable high performing FFT spectrometer using

SDR platforms and free software

  • Easily integrated in new or existing systems
  • Simple, cost effective, high performing
  • A global network of ground based stations
  • Atmospheric and interstellar measurements on a whole new

scale!

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Department of Earth and Space Sciences 14

Chalmers University of Technology

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Department of Earth and Space Sciences 15

Chalmers University of Technology