KEYWORDS: Global Positioning System, Receivers, Satellites, Data communications, Standards development, Global system for mobile communications, Doppler effect, LabVIEW, Networks, Wireless communications
During recent years, location technologies have emerged as a research area with many possible applications in wireless
communications, surveillance, military equipment, etc. Location Based Services (LBS) such as safety applications have
become very popular. For example, US Federal Communication Commission Enhanced 911 (E911) Mandate seeks to
provide emergency services personnel with location information that will enable them to dispatch assistance to wireless
911 callers much more quickly. Assisted GPS (A-GPS) is an extension of the conventional Global Positioning System
(GPS) which increases start-up sensitivity by as much as 25dB relative to conventional GPS and reduces start times to
less than six seconds. In A-GPS assistance data is delivered to the receiver through communication links. This paper
addresses the generation of the assistance for GPS simulators for testing A-GPS receivers. The proposed approach is to
use IP-based links and location support standards for assistance delivery avoiding network-specific signaling
mechanisms so that GPS receiver developers can use this information for testing A-GPS capabilities using basic GPS
simulators. The approach is implemented for the GPS simulator developed by the National InstrumentsTM.
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