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Details von Integration of a Phase Differential Ranging System in a Wireless Sensor Network Development Framework
Wireless sensor networks are closely related to the famous ”Internet of Things”, which
promises a seamlessly digitalized world. Besides communication the nodes of these net-
works need temporal and spatial relations to fulfil their task, since a sensor’s value is only
useful in the context of time and space. Therefore these two values need to be provided
within each node to enable processing and aquisition of data.
Even though the current and time and geospatial coordinates may be inferred through a
GPS receiver, this approach is not generally valid. As an example a building may occlude
the direct line of sight to the satellites disabling the GPS. Additionally, embedded devices
need to be very limited in their power usage, which poses problems with current GPS
Another approach towards the localization of the individual wireless sensor nodes is
the usage of the wireless communication. However, basic approaches using the Received
Signal Strength Indicator (RSSI) fail due to the limited coupling between distance of two
nodes and the signal strength. Therefore, other approaches need to be investigated. One
technical solution uses phase differential measurement between the sender and receiver
of the communication to derive the distance.
This approach proved to be a viable mechanism to estimate the distance between multiple
nodes, which can afterwards be used to derive the position of the nodes.
Therefore, this team project shall integrate this feature into an existing wireless sensor
network development framework based on the Contiki Operating system. Afterwards the
necessary communication overhead as well as the bandwidth difference trade-off need to
be evaluated.
Christoph Steup
in Arbeit
verteidigt am
15. August 2018