Solution for testing and evaluation of asset tracking for construction sites
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The system proposed in this project works as intended by using a UWB local positioning system with self positioned anchor nodes and NB-IoT for data link to the remote calculation server. This functionality is demonstrated successfully, however with limited or no advantage over the already widely available GPS system. The horizontal error of the final calculations were 5.1m and 2.5m, which is slightly better than than the average horizontal error of the GPS positioned anchor nodes, although this is hardly conclusive with two data points. The power consumption of the tags are also higher than that of a low power GPS module, at over 200 mA versus 20 mA. This can probably be improved, however, by further development on power cycling the UWB module and possibly utilize less power hungry modes of the DW1000 chip. Besides this, the NB-IoT communication is a success, the position calculation algorithm works well despite large anchor position errors, and the implemented device works as intended when coupled with a more capable power source.