Fraunhofer IIS Demos Satellite IoT Transmission
Thursday, June 07, 2018 | Comments

The Fraunhofer Institute for Integrated Circuits (IIS) demonstrated the direct transmission of sensor data from multiple transmitters via a geostationary satellite. For the test transmission, the institute employed portable, ground-based transmitters equipped with small, omnidirectional C-band antennas.

Fraunhofer IIS developed this particular transmission method specifically for internet of things (IoT) applications that use satellites. The particular challenges associated with using geostationary satellites for IoT applications are, the vast distance between the transmitters and the satellites and that satellites in orbit tend to use the same frequencies. This is why antennas on the ground must be relatively large, with high amplification and suitable directional capabilities, to minimize interference to neighboring satellites and systems.

The transmission concept used for the technology demonstration makes it possible to establish a direct connection from IoT sensor nodes to a satellite using portable transmission terminals equipped with a small, omnidirectional C-band antenna developed at Fraunhofer IIS. The waveform has been specially optimized for low data rates and enables successful data transmissions even at extremely low transmit power.

Transmit power has been reduced enough for the waveform to be transmitted below the threshold mandated for C-band communications. This makes omnidirectional antennas a viable option, because they require no alignment and will still not interfere with other satellite systems, a statement said.

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