Method for positioning by satellites

Cryptography – Communication system using cryptography – Position dependent or authenticating

Reexamination Certificate

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Details

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.

REFERENCES:
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patent: 5612682 (1997-03-01), DeLuca et al.
patent: 5982897 (1999-11-01), Clark
patent: 5987139 (1999-11-01), Bodin
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patent: 6031487 (2000-02-01), Mickelson
patent: 6100806 (2000-08-01), Gaukel
patent: 6317500 (2001-11-01), Murphy
patent: 6429808 (2002-08-01), King et al.
patent: 6621452 (2003-09-01), Knockeart et al.

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