MITIGATING MULTIPATH USING STATE TRANSITION DETECTION AND MEASUREMENT
First Claim
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1. A global positioning satellite (GPS) receiver, including:
- a radio frequency (RF) receiver receiving a first GPS signal from a GPS satellite; and
a processor configured to;
a) correlate the first GPS signal with a plurality of reference signals to produce a plurality of correlations,b) detect a transition between receiving the first GPS signal and receiving a second GPS signal from the GPS satellite based on a phase shift in the correlations, andc) if the transition is detected, compensate for the phase shift when computing a range to the GPS satellite.
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Abstract
A global positioning satellite (GPS) receiver that includes a radio frequency (RF) receiver receiving a first GPS signal from a GPS satellite and a processor. The processor is configured to correlate the first GPS signal with a plurality of reference signals to produce a plurality of correlations, detect a transition between receiving the first GPS signal and receiving a second GPS signal from the GPS satellite based on a phase shift in the correlations, and if the transition is detected, compensate for the phase shift when computing a range to the GPS satellite.
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Citations
20 Claims
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1. A global positioning satellite (GPS) receiver, including:
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a radio frequency (RF) receiver receiving a first GPS signal from a GPS satellite; and a processor configured to; a) correlate the first GPS signal with a plurality of reference signals to produce a plurality of correlations, b) detect a transition between receiving the first GPS signal and receiving a second GPS signal from the GPS satellite based on a phase shift in the correlations, and c) if the transition is detected, compensate for the phase shift when computing a range to the GPS satellite. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A global positioning satellite (GPS) receiver, including:
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a radio frequency (RF) receiver receiving a respective GPS signal from each of a plurality of GPS satellites; and a processor is configured to; a) correlate, for each GPS satellite, the respective GPS signal with a plurality of respective reference signals to produce a plurality of correlations, b) detect, for each GPS satellite, a transition between receiving a first GPS signal and receiving a second GPS signal based on a phase shift in the correlations, and c) if the transition is detected for a respective GPS satellite, compensate for the phase shift when computing a range to the respective GPS satellite. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A global positioning satellite (GPS) receiver, including:
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a radio frequency (RF) receiver receiving a first GPS signal from a GPS satellite; and a processor configured to; a) correlate the first GPS signal with a plurality of reference signals to produce a plurality of correlations, b) interpolate the correlations to determine a phase shift for balancing an early correlation and a late correlation value of the plurality of correlations, c) compare the phase shift to a threshold, d) detect a transition between receiving the first GPS signal and receiving a second GPS signal from the GPS satellite if the phase shift is greater than the threshold, and e) if the transition is detected, compensating for the phase shift when computing a range to the GPS satellite. - View Dependent Claims (17, 18, 19, 20)
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Specification