@article{discovery1344842, pages = {14 -- 18+27}, note = {Full text made available by kind permission of Editor}, year = {2012}, number = {2}, journal = {GPS World}, title = {Shadow matching: Improved GNSS accuracy in Urban canyons}, volume = {23}, url = {http://www.gpsworld.com/wireless/personal-navigation/shadow-matching-12550}, issn = {1048-5104}, author = {Groves, PD and Wang, L and Ziebart, M} }