Disruption detection of a positioning measurement differential correction message of a satellite geolocation device
First Claim
1. A method for detecting a disruption of a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message emitted by a satellite geolocation precision augmentation system, comprising:
- computing, for each of the satellites in view, at least one differential correction coherence metric associated with said satellite in view and depending on a positioning measurement differential correction extracted from the received differential correction message, the computation of at least one differential correction comprising;
computing, from the received composite radio signal, a first difference between a measured distance and an estimated distance between the geolocation device and the satellite in view;
computing, using said received positioning measurement differential correction message, a second difference between a measured distance and an estimated distance between the geolocation device and the satellite in view; and
computing an absolute value of a deviation between said first difference and said second difference;
detecting a disruption of the correction message when the number of satellites in view for which the associated differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites, strictly greater than one; and
if a disruption is detected, raising an alarm.
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Accused Products
Abstract
The invention relates to a disruption detection method and device for a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message (MC) emitted by a satellite geolocation precision augmentation system. The device (20) according to the invention includes modules (32) computing, for each of the satellites in view, at least one differential correction coherence metric depending on a positioning measurement differential correction (CAS) extracted from the received differential correction message (MC). The device (20) also includes a module (34) detecting a disruption of the correction message when the number of satellites for which the differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites (N0), strictly greater than one.
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Citations
12 Claims
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1. A method for detecting a disruption of a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message emitted by a satellite geolocation precision augmentation system, comprising:
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computing, for each of the satellites in view, at least one differential correction coherence metric associated with said satellite in view and depending on a positioning measurement differential correction extracted from the received differential correction message, the computation of at least one differential correction comprising; computing, from the received composite radio signal, a first difference between a measured distance and an estimated distance between the geolocation device and the satellite in view; computing, using said received positioning measurement differential correction message, a second difference between a measured distance and an estimated distance between the geolocation device and the satellite in view; and computing an absolute value of a deviation between said first difference and said second difference; detecting a disruption of the correction message when the number of satellites in view for which the associated differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites, strictly greater than one; and if a disruption is detected, raising an alarm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device detecting a disruption of a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message emitted by a satellite geolocation precision augmentation system, comprising a processor configured to:
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compute, for each of the satellites in view, at least one differential correction coherence metric associated with said satellite in view and depending on a positioning measurement differential correction extracted from the received differential correction message, the computation of at least one differential correction comprising; computing, from the received composite radio signal, a first difference between a measured distance and an estimated distance between the geolocation device and the satellite in view; computing, using said received positioning measurement differential correction message, a second difference between a measured distance and an estimated distance between the geolocation device and the satellite in view; and computing an absolute value of a deviation between said first difference and said second difference; detect a disruption of the correction message when the number of satellites in view for which the associated differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites, strictly greater than one; and raise an alarm if a disruption is detected.
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9. A method for detecting a disruption of a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message emitted by a satellite geolocation precision augmentation system, comprising:
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computing, for each of the satellites in view, at least one differential correction coherence metric associated with said satellite in view and depending on a positioning measurement differential correction extracted from the received differential correction message, the computation of at least one differential correction comprising; computing a differential correction coherence metric equal, for each satellite in view, to an absolute value of the positioning measurement differential correction extracted from the received differential correction message; detecting a disruption of the correction message when the number of satellites in view for which the associated differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites, strictly greater than one; and if a disruption is detected, raising an alarm. - View Dependent Claims (10, 11)
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12. A device detecting a disruption of a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message emitted by a satellite geolocation precision augmentation system, comprising a processor configured to:
compute, for each of the satellites in view, at least one differential correction coherence metric associated with said satellite in view and depending on a positioning measurement differential correction extracted from the received differential correction message, the computation of at least one differential correction comprising; computing a differential correction coherence metric equal, for each satellite in view, to an absolute value of the positioning measurement differential correction extracted from the received differential correction message; detect a disruption of the correction message when the number of satellites in view for which the associated differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites, strictly greater than one; and raise an alarm if a disruption is detected.
Specification