Ruizhi Chen

Ruizhi Chen holds a PhD degree in Geophysics, a MSc. degree in computer science and a BSc. degree in Surveying Engineering. He is Head of the Department of Navigation and Positioning at the Finnish Geodetic Institute and an adjunct Professor in the Department of Computer Systems at Tampere University of Technology. Dr. Chen worked in Nokia as an engineering manager from 1998-2001. He has been involved in research of multi-sensor positioning for mobile devices since 2001. He led a project to develop a 3D personal navigation system in smart phones during 2007-2010. The system was demonstrated at the Shanghai World EXPO in 2010. Dr. Chen is the member of the editor board of the Journal of Global Positioning Systems. He has published more than 110 scientific articles. He is the chair of the IEEE conference “Ubiquitous Positioning, Indoor Navigation and Location-Based Service,” held every second year. Dr. Chen is also a board member of the Nordic Institute of Navigation.


Ubiquitous Positioning and Mobile Location-Based Services in Smart Phones
Ruizhi Chen. © 2012. 344 pages.
Many smart phone users reap the benefits of location-based services. While tracking users’ positions using their smart phone is an issue of concern for some, others who use...
Introduction to Smart Phone Positioning
Ruizhi Chen. © 2012. 31 pages.
Ubiquitous positioning is now becoming a key technology for Location-Based Service (LBS) in smart phones. For outdoor environments, it is not a challenging task to locate mobile...
Assisted GNSS in Smart Phones
Ruizhi Chen. © 2012. 12 pages.
It is difficult to acquire GNSS (Global Satellite Navigation System) signals in challenging environments such as urban canyons and indoors without any assistance information. The...
WLAN and Bluetooth Positioning in Smart Phones
Ruizhi Chen, Ling Pei, Jingbin Liu, Helena Leppäkoski. © 2012. 25 pages.
Although the short range radio frequency technologies such as WLAN (Wireless Local Area Network) and Bluetooth were originally designed for the purpose of wireless communication...
Motion Restricted Information Filter for Indoor Bluetooth Positioning
Liang Chen, Heidi Kuusniemi, Yuwei Chen, Ling Pei, Tuomo Kröger, Ruizhi Chen. © 2012. 13 pages.
This paper studies wireless positioning using a network of Bluetooth signals. Fingerprints of received signal strength indicators (RSSI) are used for localization. Due to the...