AT-Angle: A Distributed Method for Localization using Angles in Sensor Networks

Determining where a given sensor is physically located is a challenging issue. In this paper, we address the local-ization problem where, initially, a certain number of sen-sors called anchors are aware of their positions. Our goal is to localize all sensors with high accuracy, while using a limited number of anchors. So, we focus on localization techniques based on angle of arrival information between neighbor nodes. This paper proposes an original angle-based localization technique, called AT-Angle, which al-lows to verify two important properties: first, a sensor node can eliminate wrong received information about its posi-tion; second, it deduces if its estimated position is closed to its real position. In this last case, the sensor node becomes an estimated anchor and contributes to the positioning of others nodes. Simulations show that AT-Angle achieves good precision for located nodes despite the introduction of position errors and the small number of anchors. 1