A Zone-Based Localization Scheme for Wireless Sensor Networks with Bilateration

Abstract

This study presents an economical yet effective localization scheme for wireless sensor networks (WSNs). The proposed scheme uses only two anchor nodes and uses bilateration to estimate the coordinates of unknown nodes. Many localization algorithms for WSNs require the installation of extra components, such as GPS receivers, ultrasonic transceivers, and unidirectional antennas, to sensors. The proposed localization scheme is range-free (i.e., not demanding any extra devices for the sensors). Experimental results show that the range error of the proposed localization scheme is less than 0.3 when the communication range is greater than 40m and node density is greater than 0.0075(node number = 300 with 200*200 m2 region). This study compares the proposed scheme with the well-known DV-Hop method. Simulation results show that the proposed scheme outperforms the DV-Hop method in localization accuracy, communication cost, and computational complexity.KeywordsBilaterationLocalization SchemeRange-FreeWireless Sensor NetworksZone-Based Method