Target Localization Using Radar Sensor Networks

Target localization in WSNs (Wireless Sensor Networks) has been an active research area due to its importance and wide range of applications. Most of the proposals so far, however, have focused on cooperative targets that in one way or another work with the localization infrastructure. For example, mobile targets can emit RF or acoustic signals either on purpose (ActiveBadges) or by their nature (e.g., bird chirps). Instead, we focus on localizing non-cooperative targets using active sensors. Specifically, we use a network of mono-static low-power, pulsed, Dopper radars that independently estimate the target's Doppler velocity with respect to each radar. These measurements are then used to estimate the target's location and true velocity using an Extended Kalman filter. We have built a prototype of this system using TelosB motes and BumbleBee radars.