System and method for protecting against spoofed A-GNSS measurement data
First Claim
1. A method of detecting one or more forged satellite measurements transmitted from a wireless device, comprising the steps of:
- (a) transmitting information to a wireless device, the information including a request that the wireless device provide a portion of a navigation data message from one or more satellites to a location determining system;
(b) receiving one or more satellite measurements and the portion of the navigation data message from the wireless device;
(c) determining the navigation data message as a function of information from a reference network; and
(d) comparing the determined navigation data message with the received navigation data message portion to thereby determine whether any of the one or more satellite measurements have been forged.
12 Assignments
0 Petitions
Accused Products
Abstract
A system and method for detecting one or more forged satellite measurements transmitted from a wireless device. Information may be transmitted to a wireless device, the information including a request that the wireless device provide a portion of a navigation data message from one or more satellites to a location determining system. The one or more satellite measurements and the portion of the navigation data message may be received from the wireless device. The navigation data message may be determined as a function of information from a reference network. The determined navigation data message may then be compared with the received navigation data message portion to thereby determine whether any of the one or more satellite measurements transmitted by the device have been forged.
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Citations
33 Claims
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1. A method of detecting one or more forged satellite measurements transmitted from a wireless device, comprising the steps of:
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(a) transmitting information to a wireless device, the information including a request that the wireless device provide a portion of a navigation data message from one or more satellites to a location determining system; (b) receiving one or more satellite measurements and the portion of the navigation data message from the wireless device; (c) determining the navigation data message as a function of information from a reference network; and (d) comparing the determined navigation data message with the received navigation data message portion to thereby determine whether any of the one or more satellite measurements have been forged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. In a method for determining whether a wireless device transmitted a forged satellite measurement, the method comprising receiving at the wireless device signals from a plurality of satellites and transmitting to a location determining system signals representing measurements from the plurality of satellites, said measurements including one or more portions of a navigation data message, the improvement comprising determining a navigation data message as a function of information from a reference network, and comparing the determined navigation data message with the received navigation data message portions to thereby determine whether one or more of the received satellite measurements have been forged.
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18. A system for detecting one or more forged satellite measurements transmitted from a wireless device, comprising:
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(a) a transmitter for transmitting information to a wireless device, the information including a request that the wireless device provide a portion of a navigation data message from one or more satellites to the system; (b) a receiver for receiving one or more satellite measurements and the portion of the navigation data message from the wireless device; (c) circuitry for determining the navigation data message as a function of information from a reference network; and (d) circuitry for comparing the determined navigation data message with the received navigation data message portion to thereby determine whether any of the one or more satellite measurements have been forged. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A method for determining the estimated location of a wireless device when the device transmits one or more forged satellite measurements to a location determining system, comprising the steps of:
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(a) sending a request to a wireless device to provide a portion of a navigation data message from one or more satellites to a location determining system; (b) receiving one or more satellite measurements and the portion of the navigation data message from the wireless device; (c) comparing the received navigation data message portion to an assembled navigation data message to thereby determine whether any of the one or more satellite measurements have been forged; and (d) estimating a location of the wireless device without the one or more forged satellite measurements, wherein the assembled navigation data message is assembled as a function of information from a reference network. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification