| 摘要 |
A satellite-based positioning system includes at least one mobile station (11) and a terrestrial station (10), which may be a cellular telephone base station and is arranged to receive ephemeris data from each in-view positioning satellite. The ephemeris data is processed in a processor (14) to provide processed data which defines the satellite orbit in Cartesian form. Processed data is transmitted over a short message service channel to each mobile receiver (11), which includes also a positioning system receiver (25). The mobile receiver (11) is able to determine its position from the processed data and from signals received from positioning satellites with reduced processing, and thus reduced power consumption and/or time, than previous mobile receivers. The terrestrial station (10) may operate as a reference receiver which modifies the processed data to correct for errors in the ephemeris data and/or atmospheric propagation effects and/or the effects of selective availability.
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