An Original Correction Method for Indoor Ultra Wide Band Ranging-based Localisation System

TL;DR

This paper presents a novel dynamic correction method for UWB-based indoor localization that improves ranging accuracy to about twenty centimeters by compensating for clock drift errors in Time of Flight measurements.

Contribution

It introduces an original correction technique that allows integrating UWB ranging into standard network messages without sacrificing accuracy.

Findings

Achieved approximately 20 cm ranging precision.

Effectively mitigated clock drift errors in UWB ToF measurements.

Enhanced indoor localization reliability using the proposed method.

Abstract

During this decade, Wireless Sensor Networks (WSNs) brought an increasing interest in the industrial and research world. One of their applications is the indoor localization. The ranging, i.e. the distance evaluation mechanism between nodes, is required to determine the position of the nodes. The research work presented in this article aims to use Ultra Wide Band (UWB) radio links to achieve an efficient ranging, based on Time of Flight (ToF) measurement. A good solution consists in integrating ranging traffic into the usual network mes-sages. However, the ToF ranging process is based on information exchanges which are temporally constrained. Once this information is encapsulated into the usual messages, the temporal constraint cannot be honoured, resulting in important ranging errors due to clock drifts. To mitigate these errors, we have introduced an original dynamic correction technique which enables a precision of twenty centimetres allowing the inclusion of ranging traffic in usual traffic