Adumbrate: Motion Detection with Unreliable Range Data

Most current work in wireless sensor networks deals with applications running on static networks, along with some localisation requirements, but without any motion detection hardware. However, many of these applications require some level of motion detection, if only to notice the cases when a network ceases to be statically located and starts to have moving nodes. As most of the currently used application scenarios rely on the assumption that motion will not happen, if a node does move it will cause significant amounts of damage to any protocols relying on this static assumption e.g. routing, localisation, aggregation, etc. In this paper we look at methods for detecting moving nodes, using only RSSI data, including an anchor-less solution to ensure that we can always detect motion. Our methods are intended to work in co-operation with existing static network localisation algorithms.