Abstract
A Hybrid Localization Algorithm Based on TOF and TDOA for Asynchronous Wireless Sensor Networks
Highlights
At present, there is an increasing number of studies focusing on wireless sensor networks (WSNs), mainly due to their rich applications in environmental monitoring, internet of things (IoT), military purposes and so on [1]–[6]
In this paper, a novel hybrid localization algorithm based on the TDOA and TOF techniques for asynchronous wireless sensor networks is proposed
For the TDOA procedure, only one transmission is required for the tag, which means that it has the least power dissipation
Summary
There is an increasing number of studies focusing on wireless sensor networks (WSNs), mainly due to their rich applications in environmental monitoring, internet of things (IoT), military purposes and so on [1]–[6]. The terminals in GPS-based localization systems require GPS receivers, which are uneconomical and unrealistic [13], [14] For this reason, many source node localization algorithms applied to wireless sensor networks have recently been proposed in the literature. Four metrics can be used to implement range-based localization algorithms: angle-of-arrival (AOA) [19]–[21], received-signal-strength (RSS) [22]–[24], time-of-arrival (TOA) [25]–[27], and timedifference-of-arrival (TDOA) [28]–[30]. For the time-based (TOA and TDOA) localization algorithms, it is of great importance to realize clock synchronization for the accurate and low-cost estimation of locations. The authors in [27] propose an accurate TOF-based localization algorithm, but there are many messages transmitted between tag-anchor pairs. We propose a hybrid TOF and TDOA localization algorithm for asynchronous wireless sensor networks.
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