NLOS Identification based on UWB impulse radio measurements for precise indoor localization

• Main Author: Chuang, Kuo Wei
• Other Authors: Law Choi Look
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2020
• Subjects: Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/139190
• Institution: Nanyang Technological University

Indoor Localization System is a promising system where it can be used locate the position of humans and objects in an indoor environment, typically using mobile phone applications[1]. The easiest way to describe Indoor Localization System or Indoor Positioning System (IPS) is that it is like a Global Positioning System (GPS) for indoor environment. Although IPS is a relatively new technology, services that leverage IPS are quickly gaining traction in places such as airports, offices, hospitals, shopping mallsand many other indoor locations where navigation can be crucial. The idea behind IPS is to precisely locate a person or an object. However, the precision of IPS can be greatly reduced by the presence of multiple obstructions in a dense indoor environment and this is a huge challenge to most of the current existing positioning systems. In this project, the focus will be on analyzing the behavior and the performance of Ultra-wideband (UWB) radio signal under different types of environment. Experiments will be conducted in environment with no obstruction for Line of Sight (LoS) signal propagation, followed by environment with obstructions for Non-line of Sight (NLOS) signal propagation. Python3 scripts are used to gather all the necessary parameters from the transceivers, these includes distance between transceivers, first path amplitude, noise level and more. Under NLOS circumstances, the measured range will be positively biased, which hinder the accuracy of the positioning system. Ray Tracing method will be used to analyze the behavior and direction of the multipaths signals in the experiment. With all the extensive experiments conducted, the positioning inaccuracy and ranging errors due to NLOS signal propagation can be concluded.