Positioning systems
First Claim
1. A method of determining the position of a mobile station, comprising:
- receiving at a terrestrial station ephemeris data from each of a plurality of satellites, the ephemeris data being indicative of the orbit of the respective satellite, processing the ephemeris data to provide processed data which is indicative of the orbit of the respective satellite but is in such a form that less subsequent processing of the data is required to determine the information about the orbit of the satellite which is required to perform position determination;
transmitting the processed data;
receiving the processed data at the mobile station; and
using the processed data at the mobile station in conjunction with signals received at said mobile station from the associated satellites to determine the position.
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Accused Products
Abstract
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.
66 Citations
19 Claims
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1. A method of determining the position of a mobile station, comprising:
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receiving at a terrestrial station ephemeris data from each of a plurality of satellites, the ephemeris data being indicative of the orbit of the respective satellite, processing the ephemeris data to provide processed data which is indicative of the orbit of the respective satellite but is in such a form that less subsequent processing of the data is required to determine the information about the orbit of the satellite which is required to perform position determination;
transmitting the processed data;
receiving the processed data at the mobile station; and
using the processed data at the mobile station in conjunction with signals received at said mobile station from the associated satellites to determine the position. - View Dependent Claims (2, 3, 4, 5)
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6. A mobile receiver comprising:
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a first receiver channel for receiving positioning signals from a plurality of positioning satellites;
a second receiver channel for receiving processed ephemeris data from a terrestrial station; and
a processor connected to the first and second receivers and arranged to use the positioning signals in conjunction with the processed ephemeris data to compute an output representative of the position of the mobile receiver, wherein the second receiver channel and the processor are arranged respectively to receive and process the processed ephemeris data in a form in which the orbits of the satellites are so defined that the amount of processing required in the processor to generate the information about the satellite orbits which is needed to compute the output is less than that which would be required if the ephemeris data were received from the terrestrial station in the form transmitted by the satellites. - View Dependent Claims (7, 8, 9, 10, 11)
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12. For use in a system for determining the position of a mobile receiver, a terrestrial station, comprising:
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a receiver for receiving ephemeris data from each of a plurality of positioning satellites, the ephemeris data being indicative of the orbit of the respective satellite;
a processor arranged to process the ephemeris data to provide processed data which is indicative of the orbit of the respective satellite but is in such a form that less subsequent processing of the data is required to determine the information about the orbit of the satellite which is required to perform position determination; and
a transmitter for transmitting the processed data in a form suitable for reception by a mobile receiver. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification