Device-Free Passive Localization based on Narrowband Channel Impulse Responses

Device-Free Passive Localization (DFPL) is capable of detecting and locating an object without requiring the object to hold any device, nor to participate actively in the localization process. This system is based on wireless sensor networks (WSN) and analyzes the reflections of wireless signals from the object. A method to localize an object based on time-delays in the channel impulse response (CIR) and an elliptical model is presented. Radar imaging is used to generate a heatmap of the environment. With the help of IEEE 802.15.4 ranging modules the algorithm is evaluated with measurements in a radio-frequency anechoic chamber.