Method of timing calibration
First Claim
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1. A method of time calibration comprising the steps of:
- determining a calibration time using system timing information and embedded satellite timing information;
transmitting to a base station the calibration time and a reference frame identifier, wherein the reference frame identifier specifies a frame boundary of a reference system pulse corresponding to the system timing information used in the determination of the calibration time; and
either receiving aiding information associated with at least one satellite signal and holding information for indicating when the aiding information expires;
or transmitting a time for indicating a time duration wherein an estimated frequency or code phase search range is valid.
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Abstract
Disclosed is a method for deriving accurate global positioning satellite (GPS) timing by calibrating frame boundaries to GPS timing. Time calibration is achieved by determining a time difference Δt between a reference GPS time (or pulse) and an nth frame boundary. The time difference Δt and a frame boundary identifier specifying the nth frame boundary are provided to a device equipped with a full or partial GPS receiver so that the GPS equipped device may synchronize itself to GPS timing. Upon synchronizing itself to GPS timing, the GPS equipped device may search for GPS signals using information provided by a geographical location server, e.g., WAG server.
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Citations
8 Claims
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1. A method of time calibration comprising the steps of:
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determining a calibration time using system timing information and embedded satellite timing information; transmitting to a base station the calibration time and a reference frame identifier, wherein the reference frame identifier specifies a frame boundary of a reference system pulse corresponding to the system timing information used in the determination of the calibration time; and either receiving aiding information associated with at least one satellite signal and holding information for indicating when the aiding information expires;
or transmitting a time for indicating a time duration wherein an estimated frequency or code phase search range is valid. - View Dependent Claims (3, 4, 5, 6)
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2. A method of time calibration comprising the steps of:
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receiving at a receiver a message at a base station having a calibration time and a reference frame identifier, wherein the message is received over one or more frames, the reference frame identifier specifying a frame boundary of a reference system pulse, the calibration time being determined using satellite timing information and the reference system pulse; and synchronizing the receiver to satellite timing using the calibration time, the reference frame identifier and a reference point in a frame specified by the reference frame identifier; and determining a second calibration time at the receiver using a detected satellite signal; and transmitting the second calibration time. - View Dependent Claims (7, 8)
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Specification