Title :
Enhanced GPS: The tight integration of received cellular timing signals and GNSS receivers for ubiquitous positioning
Author :
Rowe, Robert W. ; Duffett-Smith, Peter J. ; Jarvis, Murray R. ; Graube, Nicolas G.
Author_Institution :
Cambridge Silicon Radio, Cambridge, MA
Abstract :
GNSS receivers have been developed over 40 years with increasing levels of integration and performance, and are now able to operate in much more severe signal-degraded environments than before. Despite this, the goal of ubiquitous positioning with GNSS-only receivers is still far away, and GNSS receivers generally need support by combining, loosely or tightly, with other positioning systems. This paper describes the enhanced GPS system (EGPS), a system that tightly couples timing measurements and timing-based positioning made using cellular network signals, with GNSS receivers in cellular telephones. The system is able to achieve a near ubiquitous positioning capability, along with improvements in time to fix.
Keywords :
Global Positioning System; cellular radio; radio receivers; ubiquitous computing; GNSS receivers; cellular network signals; cellular timing signals; enhanced GPS system; signal-degraded environments; ubiquitous positioning; Costs; GSM; Global Positioning System; Land mobile radio cellular systems; Multiaccess communication; Position measurement; Satellite navigation systems; Telephone sets; Telephony; Timing;
Conference_Titel :
Position, Location and Navigation Symposium, 2008 IEEE/ION
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-1536-6
Electronic_ISBN :
978-1-4244-1537-3
DOI :
10.1109/PLANS.2008.4570111
