Method of keeping a GPS receiver in a state that enables rapid signal acquisition
First Claim
1. A method for satellite navigation, comprising:
- acquiring, by a communication device, broadcast ephemeris from a satellite signal during a data refresh operation;
computing, by the communication device, extended ephemeris from the acquired broadcast ephemeris during the data refresh operation;
determining, by the communication device, satellite navigation information from the computed extended ephemeris during a positioning operation that is different from the data refresh operation and subsequent to the data refresh operation; and
dynamically modifying, by the communication device, a time associated with a schedule of the data refresh operation based on the computed extended ephemeris.
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Accused Products
Abstract
Aspects of a method and system for keeping a device for satellite navigation in a state that enables rapid signal acquisition are provided. The device may acquire broadcast ephemeris from one or more satellite signals during a data refresh operation. The satellite signals may comprise a GPS signal, a GLONASS signal, a GALILEO signal, or a combination thereof. The device may compute extended or future ephemeris from the acquired broadcast ephemeris during the data refresh operation. In a positioning operation that is subsequent to the data refresh operation, the device may determine satellite navigation information from the computed extended ephemeris. In some instances, a time associated with a schedule of the data refresh operation may be adjusted based on the computed extended ephemeris. The extended ephemeris may be computed by integrating current and/or historic broadcast ephemeris into an orbit model.
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Citations
21 Claims
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1. A method for satellite navigation, comprising:
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acquiring, by a communication device, broadcast ephemeris from a satellite signal during a data refresh operation; computing, by the communication device, extended ephemeris from the acquired broadcast ephemeris during the data refresh operation; determining, by the communication device, satellite navigation information from the computed extended ephemeris during a positioning operation that is different from the data refresh operation and subsequent to the data refresh operation; and dynamically modifying, by the communication device, a time associated with a schedule of the data refresh operation based on the computed extended ephemeris. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A Global Navigation Satellite System (GNSS)-enabled handset, comprising:
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a GNSS front-end configured to acquire broadcast ephemeris from a satellite signal during a data refresh operation; and a processor configured to; compute extended ephemeris from the acquired broadcast ephemeris during the data refresh operation, determine satellite navigation information from the computed extended ephemeris during a positioning operation that is different from the data refresh operation and subsequent to the data refresh operation; and dynamically modify a time associated with a schedule of the data refresh operation based on the computed extended ephemeris. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A communication device for satellite navigation, comprising:
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a front-end configured to acquire satellite ephemeris during a first mode of operation; and a processor configured to; compute extended satellite ephemeris from the acquired satellite ephemeris during the first mode of operation, determine navigation information from the computed extended satellite ephemeris during a second mode of operation that is different from the first mode of operation; and transition the communication device from the second mode of operation to the first mode of operation to re-acquire the satellite ephemeris based on the computed extended satellite ephemeris. - View Dependent Claims (20, 21)
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Specification