We examine reasons for interrupting the data stream from a GPS receiver integrated into a mobile phone, and the effects such interruptions have on the pseudorange and pseudorange rate determined by the receiver in tracking mode. We present measurements of the multi-path environment inside an office at the Cavendish Laboratory, UK, and find that interruptions of several tens of seconds can be tolerated without serious impact on the positioning performance. This conclusion, if supported by measurements made in other environments typical of mobile-phone use, bodes well for the integration of GNSS receivers within mobile phones suitable for the mass market.
