Method and Apparatus for Providing Integrity Information for Users of a Global Navigation System
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Abstract
In a method for providing integrity information for users of a global navigation system, which comprises several space vehicles like satellites transmitting information to a device for position detection, the transmitted information comprises first information from the global navigation system about the accuracy of a signal in space error SISE of a faulty space vehicle, and second information whether or not the global navigation system assesses the faulty space vehicle as faulty. The invention is based on the assumption how exact a fault can be detected, so that performance the global navigation system can be increased; and no unfounded assumption is used which improves the quality of service.
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Citations
28 Claims
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1-14. -14. (canceled)
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15. Method for providing integrity information for users of a global navigation system, said method comprising:
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a plurality of space vehicles transmitting information to a device for position detection;
wherein the transmitted information includes,a first information from the global navigation system about the accuracy of a signal in space error SISE of a faulty space vehicle; and a second information that specifies whether or not the global navigation system assesses the faulty space vehicle as faulty. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A device for position detection by means of a global navigation system in which a plurality of space vehicles transmit information to the device for determining the position of the device in space;
- wherein the device comprises;
receiving means for receiving an integrity information that includes a first information from the global navigation system about the accuracy of a signal in space error SISE of a faulty space vehicle; and
a second information that specifies whether or not the global navigation system assesses the faulty space vehicle as faulty;processing means for calculating an integrity risk from the received first and second information, and from further information; and alert means for raising an alert if the calculated integrity risk is larger than an allowed integrity risk. - View Dependent Claims (22, 23, 24, 25, 26)
- wherein the device comprises;
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27. The method for determining integrity risk of information disseminated from space vehicles in a global navigation system which provides integrity information that includes a first information from the global navigation system about the accuracy of a signal in space error SISE of a faulty space vehicle;
- and a second information that specifies whether or not the global navigation system assesses the faulty space vehicle as faulty;
said method comprising;checking that the integrity information received for every integrity data stream is the integrity information generated by the integrity function of the ground infrastructure; selecting out of redundant and positively checked integrity data-streams the integrity data stream to be used; determining from selected and positive checked integrity information and the navigation information which signals are valid; computing an integrity risk at the alert limit for the critical operation period wherein only valid signals are considered; and computing a number of critical space vehicles for the critical operation period, considering only space vehicles that provide valid signals; and generating an alert for the user which indicates whether or not the received information should be used for position detection. - View Dependent Claims (28)
- and a second information that specifies whether or not the global navigation system assesses the faulty space vehicle as faulty;
Specification