SYSTEM AND METHOD FOR DETERMINING FALSIFIED GEOGRAPHIC LOCATION OF A MOBILE DEVICE
First Claim
1. A method for determining whether an estimated location of a wireless device includes one or more forged satellite measurements, comprising the steps of:
- (a) determining an estimated location of the wireless device from signals received from a first set of satellites;
(b) obtaining a set of residuals as a function of the estimated location;
(c) comparing the obtained set of residuals to a reference set of residuals; and
(d) identifying the estimated location as having one or more forged satellite measurements if the comparison between the obtained set and reference set of residuals is less than a predetermined threshold.
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Accused Products
Abstract
A system and method for determining whether an estimated location of a wireless device includes one or more forged satellite measurements. An estimated location of the wireless device may be determined from signals received from a first set of satellites, and a set of residuals obtained as a function of the estimated location. The obtained set of residuals may then be compared to a reference set of residuals. If the comparison between the obtained set and reference set of residuals is less than a predetermined threshold, then the estimated location may be identified as having one or more forged satellite measurements.
84 Citations
27 Claims
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1. A method for determining whether an estimated location of a wireless device includes one or more forged satellite measurements, comprising the steps of:
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(a) determining an estimated location of the wireless device from signals received from a first set of satellites; (b) obtaining a set of residuals as a function of the estimated location; (c) comparing the obtained set of residuals to a reference set of residuals; and (d) identifying the estimated location as having one or more forged satellite measurements if the comparison between the obtained set and reference set of residuals is less than a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. In a method for determining whether an estimated location of a wireless device includes a forged satellite measurement, the method comprising receiving at the wireless device signals from a plurality of satellites and determining an estimated location of the wireless device from the received signals, the improvement comprising comparing a set of residuals obtained from the estimated location with a reference set of residuals, and identifying the estimated location as having a forged satellite measurement if the comparison is less than a predetermined threshold.
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19. A system for determining whether an estimated location of a wireless device includes one or more forged satellite measurements, comprising:
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(a) circuitry for determining an estimated location of the wireless device from signals received from a set of satellites; (b) circuitry for calculating a set of residuals as a function of the estimated location; (c) a database having information from a reference station network; (d) circuitry for comparing the obtained set of residuals to a reference set of residuals provided by the reference network; and (e) circuitry for identifying the estimated location as having one or more forged satellite measurements if the comparison between the obtained set and reference set of residuals is less than a predetermined threshold. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification