Apparatus and methods to share time and frequency data between a host processor and a satellite positioning system receiver
First Claim
1. A host processor in communication with a SPS receiver comprising:
- a real-time clock;
a time computing device to estimate a SPS time based on the real-time clock; and
a conversion factor adjuster to adjust the time computing device to synchronize a time developed from the real-time clock with a SPS time received from the SPS receiver and to correct a local frequency error of the real-time clock.
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Abstract
Methods and apparatus to share time and frequency data between a host processor and a satellite position system (SPS) receiver in a satellite positioning system are disclosed. An example method disclosed herein generates a host processor local time based on a real-time clock associated with the host processor; adjusts the host processor local time to synchronize with a SPS time received from the SPS receiver and to correct a local frequency error of the real-time clock of the host processor; calculates an estimated SPS time based on the adjusted real-time clock signal of the host processor; and attempts to fix a SPS time and a position of the SPS receiver from SPS signals received from a plurality of SPS satellites based on the estimated SPS time.
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Citations
25 Claims
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1. A host processor in communication with a SPS receiver comprising:
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a real-time clock;
a time computing device to estimate a SPS time based on the real-time clock; and
a conversion factor adjuster to adjust the time computing device to synchronize a time developed from the real-time clock with a SPS time received from the SPS receiver and to correct a local frequency error of the real-time clock. - View Dependent Claims (2, 3)
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4. A SPS receiver in communication with a host processor comprising:
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a receiver to receive an estimated SPS time based on a real-time clock signal of the host processor; and
a radio processor to receive SPS signals from a plurality of satellites, wherein the radio processor attempts to derive a SPS time and SPS receiver location from SPS signals received from a plurality of SPS satellites and the estimated SPS time. - View Dependent Claims (5, 6, 7, 8)
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9. A SPS receiver in communication with a host processor comprising
a radio processor to receive SPS signals from a plurality of satellites, wherein the radio processor attempts to derive a SPS time and SPS receiver location from SPS signals received from a plurality of SPS satellites; - and
wherein the SPS receiver outputs the derived SPS time to facilitate estimation of SPS times by the host processor. - View Dependent Claims (10, 11, 12, 13)
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14. A method of sharing time and frequency data between a host processor and a SPS receiver comprising:
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developing a local time of the host processor based on a real-time clock associated with the host processor;
deriving a SPS time and SPS receiver location from SPS signals received from a plurality of SPS satellites; and
using the derived SPS time to adjust parameters associated with developing the local time of the host processor based on the real-time clock to correct a local frequency error of the real-time clock. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification