Low-Cost GNSS Simulators With Wireless Clock Synchronization for Indoor Positioning

Low Cost Indoor Positioning System

This report describes a low cost indoor position sensing system utilising a combination of radio frequency and ultrasonics. Using a single rf transmitter and four ceiling mounted ultrasonic transmitters it provides coverage in a typical room in an area greater than 8m by 8m. As well as finding position within a room, it uses data encoded into the rf signal to determine the relevant web server f...

Augmentation of Low-cost GPS/MEMS INS with UWB Positioning System for Seamless Outdoor/Indoor Positioning

Makoto Tanigawa received his Bachelor’s degree in Nuclear Engineering in 1997 from The Pennsylvania State University and subsequently worked as a reactor core analysis engineer for Westinghouse Electric Company. In 2003, he obtained a Master’s degree in Electrical Engineering from University of Twente in the Netherlands. He spent 3.5 years at ASTRON (Netherlands Institute for Radioastronomy) de...

Clock Synchronization for Wireless Networks

Time synchronization is a fundamental service in many wireless applications. While the synchronization problem is well-studied in traditional wired networks, physical constraints of the wireless medium impose a unique set of challenges. We present a novel time synchronization algorithm which is highly energy efficient and failure/recovery-tolerant. Our algorithm allows nodes to synchronize to s...

Indoor Positioning with GNSS-Like Local Signal Transmitters

IPS - Indoor Positioning System with Wireless Sensors

Recent developments in the area of ubiquitous and pervasive computing emphasize the interest in context-aware applications. Location is probably the most important context. Indoor location estimation and tracking remains challenging due to the lack of usable and cost-effective technologies. GPS has proved itself for outdoor usage, but it is not suitable for indoor applications due to poor cover...