No abstract

Abstract-Radio signals can be used to detect the presence of a person (target) in an environment by analysing the fluctuations in the Received Signal Strength Indicator (RSSI). The velocity of the target can be estimated by examining the sequence of disturbances in consecutive radio links over a period of time. This requires knowledge of the deployment of the radio transceivers and the time when the target crosses the Line of Sight (LoS) of each radio link. However, it is not trivial to precisely estimate the exact time of the link crossing due to the broad range of RSSI fluctuations generated as the target approaches the link. In this paper, we evaluate and compare 15 techniques for estimating the velocity of the target and propose enhancements to some of the techniques. In our experiments the techniques perform with an average accuracy in the range between 13.02% and 96.18%, which corresponds to an average error of 0.05m/s for a moving target.

To address the heterogeneity and scalability issues of simulating Cooperating Objects (COs) systems, we propose KASSANDRA, a conceptual framework for enabling distributed COs simulation by integrating existing simulation tools. Moreover, KASSANDRA exploits the communication middleware used by real-world COs as underlying communication mechanism for integrating KASSANDRA-enabled simulation tools. In this way, real-world COs can be included with simulated objects in a seamless way to perform more accurate system performance evaluation. Moreover, such a hardware-in-the-loop approach is not limited to pre-deployment performance analysis, and can offer possibilities to analyse performance at different phases of CO applications. The concept of KASSANDRA has been carried out in the EU PLANET project. In this paper, we introduce the KASSANDRA framework components While working on the paper, Marc Schwarzbach was associated with the German Aerospace Center (DLR),