Cryptography – Communication system using cryptography – Position dependent or authenticating
Reexamination Certificate
2006-09-12
2006-09-12
Smithers, Matthew (Department: 2137)
Cryptography
Communication system using cryptography
Position dependent or authenticating
C380S270000, C701S213000, C701S215000, C455S411000, C455S430000, C340S426190
Reexamination Certificate
active
07106863
ABSTRACT:
The invention relates to a security-protected system for positioning by satellites, comprising a constellation of satellites (11) sending out positioning signals under the control of a set of ground stations (14). A user receiver of the said positioning signals comprises means for sending, to a ground station, a request calling for a key which is necessary for interpreting them, advantageously accompanied by a recopy of the positioning signals received. User servicing ground stations comprise means for receiving this request, calculating the position of the user and verifying whether the user possesses a privileged status, and means for addressing the said key to the user receiver, in the event that the verification is positive, this key further comprising means for interpreting the positioning signals with the aid of the key so as to deduce his own position therefrom.
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Agence Spatiale Europeenne
Fields Courtney
Smithers Matthew
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