Data Mining: Practical Machine Learning Tools and Techniques, Second Edition (Morgan Kaufmann Series in Data Management Systems)
Proceedings of the 6th international conference on Mobile systems, applications, and services
Micro-Blog: sharing and querying content through mobile phones and social participation
Proceedings of the 6th international conference on Mobile systems, applications, and services
Proceedings of the 7th international conference on Mobile systems, applications, and services
Ambulation: A Tool for Monitoring Mobility Patterns over Time Using Mobile Phones
CSE '09 Proceedings of the 2009 International Conference on Computational Science and Engineering - Volume 04
Does On-body Location of a GPS Receiver Matter?
BSN '10 Proceedings of the 2010 International Conference on Body Sensor Networks
On-body device localization for health and medical monitoring applications
PERCOM '11 Proceedings of the 2011 IEEE International Conference on Pervasive Computing and Communications
PerPos: a translucent positioning middleware supporting adaptation of internal positioning processes
Proceedings of the ACM/IFIP/USENIX 11th International Conference on Middleware
Place lab: device positioning using radio beacons in the wild
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
Indoor positioning using GPS revisited
Pervasive'10 Proceedings of the 8th international conference on Pervasive Computing
Challenges for social sensing using WiFi signals
Proceedings of the 1st ACM workshop on Mobile systems for computational social science
When assistance becomes dependence: characterizing the costs and inefficiencies of A-GPS
ACM SIGMOBILE Mobile Computing and Communications Review
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Positioning using GPS receivers is a primary sensing modality in many areas of pervasive computing. However, previous work has not considered how people's body impacts the availability and accuracy of GPS positioning and for means to sense such impacts. We present results that the GPS performance degradation on modern smart phones for different hand grip styles and body placements can cause signal strength drops as high as 10-16 dB and double the positioning error. Furthermore, existing phone applications designed to help users identify sources of GPS performance impairment are restricted to show raw signal statistics. To help both users as well as application systems in understanding and mitigating body and environment-induced effects, we propose a method for sensing the current sources of GPS reception impairment in terms of body, urban and indoor conditions. We present results that show that the proposed autonomous method can identify and differentiate such sources, and thus also user environments and phone postures, with reasonable accuracy, while relying solely on GPS receiver data as it is available on most modern smart phones.