Proceedings of the 25th annual conference on Computer graphics and interactive techniques
The cricket compass for context-aware mobile applications
Proceedings of the 7th annual international conference on Mobile computing and networking
Sonar Signal Processing
A new method for auto-calibrated object tracking
UbiComp'05 Proceedings of the 7th international conference on Ubiquitous Computing
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Indoor localisation technologies have received considerable attention in recent years and they are applicable in many fields. As with outdoor systems, they both suffer degradation in performance when multi-path errors are present. Applications include locating essential equipment in hospitals and specific items in warehouses, tracking people with special needs, who are away from visual supervision, and navigating firefighters inside buildings. In this article, we study issues associated with the implementation of a passive low cost, low computational complexity and low power consumption ranging and tracking system using ultrasonic sensor arrays. Due to the physical limitation of these sensors, they are placed in a zig-zag configuration to simulate an approximate linear array. To perform localisation, this system utilises the matrix pencil algorithm to estimate the direction-of-arrival (DOA) of the signal based on the phase delays of the array elements whereas the range estimation is performed by triangulation, based on DOA information from two identical arrays. Multi-access capability is also implemented to accommodate a multiple-transmitter environment. We present real-time experimental results to illustrate the satisfactory performance of the ranging and tracking system in an indoor environment setup.