Location awareness and navigation are becoming one of the most important features in
mobile phones and smartphones. Personal navigation and location based services are
enlarging the scope of mobile applications. GPS is the most efficient positioning technology.
Thanks to the reduction in the size of the GPS receivers and the integration of GPS with
mobile phones, GPS is one of the most important service providers for LBS. Since mobile
phones and smartphones usually have relatively low cost GPS chips, the performance of
locating accuracy is highly dependent on environmental factors.
This paper proposes a localization improvement algorithm in GPS interfering spots by
integrating information of multiple sensors such as gyroscope and compass in the
smartphone. The proposed algorithm is implemented in a smartphone and the performance is
evaluated on a campus.
The proposed algorithm has better performance than only the GPS location information in
GPS interfering spots and maintains reasonable performance in open spaces where the GPS
receiver is accurate. As a future work, we consider localization improvement method for
smartphones using other built-in sensors such as accelerometer and camera.