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#News(IoTStack) [ via IoTForIndiaGroup ]
The Fraunhofer Institute for Integrated Circuits IIS has successfully 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, omni-directional C-band antennas.
Fraunhofer IIS developed this particular transmission method specifically for Internet of Things applications that use satellites (Satellite IoT).
The particular challenges associated with using GEO satellites for IoT applications are, first, the vast distance between the transmitters and the satellites (about 36,000 km) and, second, 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 minimise interference to neighboring satellites and systems.
Successful data transmission even at extremely low transmit power
The transmission concept used for the technology demonstration makes it possible to establish a direct connection from IoT sensor nodes to a GEO satellite using portable transmission terminals equipped with a small, omni-directional C-band antenna developed at Fraunhofer IIS. The waveform has been specially optimised 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 omni-directional antennas a viable option, since they require no alignment and will still not interfere with other satellite systems. The solution’s real advantage is that it can be operated using small, cost-effective transmitter and receiver terminals that offer long battery life.
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