A Dual-Tone Radio Interferometric Tracking System

Localization in wireless sensors networks (WSNs) has been increasingly significant recently due to the demand of the location-aware services. The low cost and high accuracy requirements make many positioning systems adopt high-accuracy quasi-synchronization method. However it remains synchronization errors which lower positioning and tracking precision within such systems. Hence, we propose a tracking system with low-accuracy quasi-synchronization method based on dual-tone radio interferometric signals. A mobile target emits dual-tone signals whose phases contain range information. Several anchors with known positions receive the dual-tone signals and extract their phase information. We cancel the synchronization error by differentiating two phases estimated from two consecutive time instants to increase accuracy. The tracking accuracy is evaluated by simulations. The tracking system enjoys low complexity, low cost and obtains a reasonable accuracy.

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