A tag-less ultrawide-band passive tracking system

Abstract

UltraWide-Band (UWB) low-power devices are becoming an increasingly effective solution for tracking and positioning systems, especially in IoT devices with limited power sources. Background models can be created by analysing the radio frequency or channel impulse response in a static environment. Comparing this background model with runtime measurements it is possible to identify moving objects inducing changes in the impulse responses, and as a consequence, we can compute the distance of the object from the radar devices, usually consisting of one transmitter and one receiver. In particular, using multiple receivers, it becomes possible to elaborate a 2D position of the moving object. This type of tag-less passive tracking system has the advantage of retrieving the trajectory of a moving object without the adoption of any additional electronic device. In this paper, we present an IoT positioning architecture achieving an RMSE of about 30 cm.

Bidirectional UWB Localization: A Review on an Elastic Positioning Scheme for GNSS-Deprived Zones

“…Please note that this article focuses on active or device-based UWB localization schemes, which require attaching a tag to a mobile device or subject to determine its location. Devicefree or passive UWB localization schemes [44]- [46], where a mobile subject's location can be estimated without a specific tag, are not within the scope of this article.…”