Improved TOA‐Based Localization Method with BS Selection Scheme for Wireless Sensor Networks

• Published in: ETRI journal Vol. 37; no. 4; pp. 707 - 716
• Main Authors: Go, Seungryeol, Chong, Jong‐Wha
• Format: Journal Article
• Language: English
• Published: Electronics and Telecommunications Research Institute (ETRI) 01.08.2015; 한국전자통신연구원
• Subjects: BS selection; Location estimation; NLOS; non‐line‐of‐sight; time of arrival; TOA; wireless localization; wireless sensor networks; 전자/정보통신공학
• ISSN: 1225-6463; 2233-7326; 2233-7326
• DOI: 10.4218/etrij.15.0114.1251

The purpose of a localization system is to estimate the coordinates of the geographic location of a mobile device. The accuracy of wireless localization is influenced by non‐line‐of‐sight (NLOS) errors in wireless sensor networks. In this paper, we present an improved time of arrival (TOA)–based localization method for wireless sensor networks. TOA‐based localization estimates the geographic location of a mobile device using the distances between a mobile station (MS) and three or more base stations (BSs). However, each of the NLOS errors along a distance measured from an MS (device) to a BS (device) is different because of dissimilar obstacles in the direct signal path between the two devices. To accurately estimate the geographic location of a mobile device in TOA‐based localization, we propose an optimized localization method with a BS selection scheme that selects three measured distances that contain a relatively small number of NLOS errors, in this paper. Performance evaluations are presented, and the experimental results are validated through comparisons of various localization methods with the proposed method.