Anchor-oriented Time and Phase-based Concurrent Self-localization using UWB Radios

Abstract

Positioning plays an important role in many IoT applications. Ultra-wideband (UWB)-based positioning is an alternative to GPS in indoor environments due to its multipath resilience and its accuracy and precision. In the presence of a large number of targets to localize, conventional UWB localization fails to provide a practical location update rate. UWB concurrency in conjunction with self-localization has been used in both time-based and phase-based localization making the targets to localize (tags), a relatively passive device with the sole role of receiving wireless packets and calculating its own location. More recently, phase-based concurrent angle estimation also offloaded the hardware complexity and cost to the anchors instead of the tags. In this work, our anchor-oriented approach combines inter-anchor and intra-anchor concurrency for phasebased localization but also allows time-based localization. Our experimental evaluation on a testbed consisting of Decawave platform shows that our technique is not only practical but also performant.

Future Research and Trends in Ultra-Wideband Indoor Tag Localization

“…This research designs a concurrent localization system that perform multi-tag localization while optimizing localization time. In his research, Samoui designed a concurrent localization system that involved inter-anchor and intra-anchor concurrency by combining AoA and TDoA [158].…”

“…The self-localization method is usually combined with concurrent ranging where messages are sent simultaneously, and location estimation calculations are performed on each tag as proposed by Samoui [158]. Meanwhile, Groswindhager not only reduces the number of messages but also self-localizes each tag [156], [157].…”

“…Navratil et al not only proposed the TDoA technique with the free-running clock but also proposed twoway concurrent ranging [170]. Concurrent ranging was also proposed by Smaoui with a combination of TDoA and AoA techniques [171]. Meanwhile, Heydariaan conducted concurrent ranging against AoA ranging [116].…”

“…Chen et.al. proposed a wireless energy harvesting localization system using RF signals consisting of batteryless wireless sensors as anchors and energy access points to transmit power to anchors [158].…”