Method and apparatus for determining the geographic location of a device
First Claim
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1. A method for determining the location of a device comprising the steps of:
- (a) receiving a first plurality of signals comprising one signal from each of a first plurality of satellites;
(b) determining a first location of the device as a function of the first plurality of signals;
(c) determining a second location of the device as a function of a second plurality of signals if the first location is not within a predetermined threshold; and
,(d) determining a third location of the device as a function of a third plurality of signals if the second location is not within the predetermined threshold,wherein the second plurality of signals is a first subset of the first plurality of signals, wherein the third plurality of signals is a second subset of the first plurality of signals and wherein a cardinality of the second plurality of signals is the same or greater than a cardinality of the third plurality of signals.
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Abstract
A method and apparatus for determining the location of a device from signals provided by a plurality of satellites. A device receives a first plurality of signals comprising one signal from each of a first plurality of satellites and determines a first location of the device as a function of the first plurality of signals. The device then determines a second location thereof as a function of a second plurality of signals if the first location is not within a predetermined threshold. The second plurality of signals is a first subset of the first plurality of signals.
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Citations
20 Claims
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1. A method for determining the location of a device comprising the steps of:
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(a) receiving a first plurality of signals comprising one signal from each of a first plurality of satellites; (b) determining a first location of the device as a function of the first plurality of signals; (c) determining a second location of the device as a function of a second plurality of signals if the first location is not within a predetermined threshold; and
,(d) determining a third location of the device as a function of a third plurality of signals if the second location is not within the predetermined threshold, wherein the second plurality of signals is a first subset of the first plurality of signals, wherein the third plurality of signals is a second subset of the first plurality of signals and wherein a cardinality of the second plurality of signals is the same or greater than a cardinality of the third plurality of signals. - View Dependent Claims (2)
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- 3. In a method for eliminating erroneous satellite signals in a position calculation for a device receiving a first plurality of signals from a first plurality of satellites, the improvement comprising the steps of determining a first position calculation of the device as a function of the first plurality of signals, determining a second position calculation of the device as a function of a second plurality of signals if the first calculation is not within a predetermined threshold, and determining a third location of the device as a function of a third plurality of signals if the second location is not within the predetermined threshold, wherein the second plurality of signals is a first subset of the first plurality of signals, wherein the third plurality of signals is a second subset of the first plurality of signals, and wherein a cardinality of the second plurality of signals is the same or greater than a cardinality of the third plurality of signals.
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11. A device comprising:
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a receiver for receiving a first plurality of signals comprising one signal from each of a first plurality of satellites; a means for determining a first location of the device as a function of the first plurality of signals; a means for determining a second location of the device as a function of a second plurality of signals if the first location is not within a predetermined threshold, wherein the second plurality of signals is a first subset of the first plurality of signals; and a means for determining a third location of the device as a function of a third plurality of signals if the second location is not within the predetermined threshold, wherein the third plurality of signals is a third subset of the first plurality of signals and wherein a cardinality of the second plurality of signals is the same or greater than a cardinality of the third plurality of signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification