Method and apparatus for enhanced autonomous GPS
First Claim
Patent Images
1. An apparatus, comprising:
- a memory configured to store satellite tracking data received from a server, the satellite tracking data having a predetermined validity time period;
a satellite signal receiver configured to receive ephemeris data from a satellite positioning system (SPS) satellite; and
a processor configured to, when a connection between the apparatus and the server is unavailable and the predetermined validity time period has expired, calculate acquisition assistance data using the satellite tracking data and compute a position of the apparatus by decoding the ephemeris data received from the SPS satellite using the acquisition assistance data.
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Abstract
A method and apparatus for determining a location of a remote receiver is described. The remote receiver receives satellite tracking data from a server, which it stores in memory. This satellite tracking data has a predetermined validity time period associated with it. When a connection cannot be established between the remote receiver and the server and the predetermine validity time period of the satellite tracking data has expired, the remote receiver calculates acquisition assistance data using the expired satellite tracking data for use with obtaining ephemeris data from a satellite. The remote receiver then calculates its position using the receiver ephemeris data.
36 Citations
20 Claims
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1. An apparatus, comprising:
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a memory configured to store satellite tracking data received from a server, the satellite tracking data having a predetermined validity time period; a satellite signal receiver configured to receive ephemeris data from a satellite positioning system (SPS) satellite; and a processor configured to, when a connection between the apparatus and the server is unavailable and the predetermined validity time period has expired, calculate acquisition assistance data using the satellite tracking data and compute a position of the apparatus by decoding the ephemeris data received from the SPS satellite using the acquisition assistance data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining a position of a remote device, comprising:
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receiving satellite tracking data from a server, the satellite tracking data having a predetermined validity time period; receiving ephemeris data from a satellite positioning system (SPS) satellite; determining whether a connection between the remote device and the server is available; determining whether the predetermined validity time period has expired; and when the connection is unavailable and the predetermined validity time period has expired, calculating acquisition assistance data based on the satellite tracking data and computing a position of the remote device by decoding the ephemeris data received from the SPS satellite using the calculated acquisition assistance data. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of determining a position of a remote device, comprising:
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receiving satellite tracking data from a server; receiving ephemeris data from a plurality of satellite positioning system (SPS) satellites; determining whether a connection between the remote device and the server is available; determining whether the received satellite tracking data is valid; and calculating a position of the remote device based on the satellite tracking data or the ephemeris data depending on whether the connection between the remote device and the server is available and whether the received satellite tracking data is valid. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification