Signal verification
First Claim
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1. A global navigation satellite system comprising a receiver configured to:
- receive an indication of a validity of orbit data of a satellite determined from a comparison of a modeled position of the satellite to a time-calculation-based position; and
determine a validity of positional information associated with the orbit data when the received indication shows that the modeled position of the satellite is substantially identical to the time-calculation-based position.
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Abstract
A first position of a satellite is calculated at a first time in dependence on received orbit data corresponding to an orbit path of the satellite. An orbit path of the satellite is modeled from the first position at the first time to a second time to determine a second position of the satellite at the second time. A third position of the satellite is then calculated at the second time in dependence on the received orbit data. The second position and third position are compared to determine a validity of the orbit data.
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Citations
20 Claims
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1. A global navigation satellite system comprising a receiver configured to:
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receive an indication of a validity of orbit data of a satellite determined from a comparison of a modeled position of the satellite to a time-calculation-based position; and determine a validity of positional information associated with the orbit data when the received indication shows that the modeled position of the satellite is substantially identical to the time-calculation-based position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A global navigation satellite system validating orbit data of a satellite, the global navigation satellite comprising:
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a communication receiver having a processor configured to; calculate a modeled position of the satellite using a first satellite position at a first time in dependence on the orbit data corresponding to an orbit path of the satellite, the orbit path modeled from the first satellite position at the first time to a second time to determine the modeled position of the satellite at the second time; calculate a time-based position of the satellite using time information and the orbit data from the satellite at the second time, wherein the orbit data comprises data points at a third time which falls within a period for which the orbit data describes a segment of the satellite'"'"'s path; and transmit the modeled position and the time-based position; and a data receiver configured to; receive the modeled position and the time-based position; compare the modeled position and the time-based position; determine a validity of positional information associated with the orbit data when the received modeled position is substantially identical to the time based position; and determine a fault of positional information associated with the orbit data when an error corresponding to a difference between the modeled position and the time-based position exceeds a threshold.
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19. A global navigation satellite system validating orbit data of a satellite, the global navigation satellite comprising:
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a communication receiver having a processor configured to; calculate a modeled position of the satellite using a first satellite position at a first time in dependence on the orbit data corresponding to an orbit path of the satellite, the orbit path modeled from the first satellite position at the first time to a second time to determine the modeled position of the satellite at the second time; calculate a time-based position of the satellite using time information and the orbit data from the satellite at the second time, wherein the orbit data comprises data points at a third time which falls within a period for which the orbit data describes a segment of the satellite'"'"'s path; compare the modeled position and the time-based position; determine a validity of positional information associated with the orbit data when the modeled position is substantially identical to the time based position; and transmit the validity of positional information; and a data receiver configured to receive the validity of positional information.
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20. A global navigation satellite system comprising:
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a satellite receiving orbit data from a ground control station, the satellite broadcasting the orbit data and time information; a communication receiver having a processor configured to; receive the orbit data and the time information; calculate a modeled position of the satellite using a first satellite position at a first time in dependence on the orbit data corresponding to an orbit path of the satellite modeled from the first satellite position at the first time to a second time to determine the modeled position of the satellite at the second time; calculate a time-based position of the satellite using the time information and the orbit data at the second time, wherein the orbit data comprises data points at a third time which falls within a period for which the orbit data describes a segment of the satellite'"'"'s path; compare the modeled position and the time-based position; determine a validity of positional information associated with the orbit data when the modeled position is substantially identical to the time based position; determine a fault of positional information associated with the orbit data when an error corresponding to a difference between the modeled position and the time-based position exceeds a threshold; and transmit the validity or the fault of positional information; and a data receiver configured to receive the validity or the fault of positional information.
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Specification