Patent ID: 6670915
Filing Date: 2003-12-30
Classification: G01S

Abstract:
A satellite positioning system (SPS) receiver, comprising:a navigation satellite signal receiver for receiving transmissions directly from orbiting SPS satellites and for measuring their pseudoranges; a real time clock (RTC) accurate to within three seconds of true SPS system time; a communications receiver for receiving rebroadcasts of SPS system NAV-data obtained by a remote server; and a NAV-data synthesizer connected to the RTC and the communications receiver, and for providing reconstructions of NAV-data that are otherwise impossible to receive directly through the navigation satellite signal receiver, and that convert time information from the RTC, and almanac and ephemeris data from said rebroadcasts of SPS system NAV-data, to build a complete 12.5-minute-long synthesized NAV-data message; wherein, position solutions can be derived from said pseudoranges and said synthesized NAV-data message.