Dual-stream Mobile Beacon Based Localization Scheme for Wireless Sensor Network

Knowing each sensor location is essential for efficiently managing the wireless sensor network. There are many localization schemes; some presume to use the mobile beacon because it has much potential. This paper presents a novel mobile beacon-based range-based localization scheme. In the proposed method, a mobile beacon traverses the area with two onboard Zigbee and a magnetometer. These radio transceivers are kept diagonal from each other, where the diagonal distance is symmetric to a square geometry. The mobile beacon broadcasts two beacon messages at each beacon point. The sensor node receives the beacon messages containing the beacon point coordinates of each Zigbee and the direction of the mobile beacon from the magnetic compass. The sensor node utilizes the beacon information and identifies its initial proximity using the received signal strength (RSS) and the direction of the mobile beacon. The sensor node estimates its distance from the mobile beacon using RSS and utilizes the geometric formulation to locate its position. The geometric formulation estimates two positions of the sensor node. To identify the valid position of the sensor node, the sensor node utilizes the beacon information. The simulation and experimental results show that the proposed scheme localizes the sensor node with minimum localization error.