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Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
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Volume 6, issue 2
Geosci. Instrum. Method. Data Syst., 6, 285-292, 2017
https://doi.org/10.5194/gi-6-285-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The Earth’s magnetic field: measurements, data, and applications...

Geosci. Instrum. Method. Data Syst., 6, 285-292, 2017
https://doi.org/10.5194/gi-6-285-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 09 Aug 2017

Research article | 09 Aug 2017

Automated observatory in Antarctica: real-time data transfer on constrained networks in practice

Stephan Bracke, Alexandre Gonsette, Jean Rasson, Antoine Poncelet, and Olivier Hendrickx Stephan Bracke et al.
  • Institut Royal Météorologique (IRM), Centre de Physique du Globe, 5670 Viroinval (Dourbes), Belgium

Abstract. In 2013 a project was started by the geophysical centre in Dourbes to install a fully automated magnetic observatory in Antarctica. This isolated place comes with specific requirements: unmanned station during 6 months, low temperatures with extreme values down to −50°C, minimum power consumption and satellite bandwidth limited to 56Kbits−1. The ultimate aim is to transfer real-time magnetic data every second: vector data from a LEMI-25 vector magnetometer, absolute F measurements from a GEM Systems scalar proton magnetometer and absolute magnetic inclination–declination (DI) measurements (five times a day) with an automated DI-fluxgate magnetometer. Traditional file transfer protocols (for instance File Transfer Protocol (FTP), email, rsync) show severe limitations when it comes to real-time capability. After evaluation of pro and cons of the available real-time Internet of things (IoT) protocols and seismic software solutions, we chose to use Message Queuing Telemetry Transport (MQTT) and receive the 1s data with a negligible latency cost and no loss of data. Each individual instrument sends the magnetic data immediately after capturing, and the data arrive approximately 300ms after being sent, which corresponds with the normal satellite latency.

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In 2013 the scientists from the geophysical centre in Dourbes started a project to install a fully automated observatory in Antarctica. The ultimate aim is to have real-time data coming in to Dourbes every second. After evaluation of different data transfer protocols, we chose to use Message Queuing Telemetry Transport (MQTT) and receive the 1 s data with a negligible latency cost and no loss of data.
In 2013 the scientists from the geophysical centre in Dourbes started a project to install a...
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