Here, we evaluate different means to improve the detection accuracy of passive presence detection based on the application scenarios velocity estimation and queueing systems. First, we evaluate and compare 15 techniques for estimating the velocity of a person. The analysis is based on each technique's detection accuracy when sensing a Line of Sight (LoS) crossing event between radio transceivers. Second, we analyse Bluetooth Low Energy as alternative radio technology for RSSI-based passive presence detection. Third, we create a prototype queueing system estimating the number of people waiting in line and the occupancy level of the waiting area based on the insights of the previous sections. The resulting system has a high portability, is easy to deploy and has a high detection accuracy.
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