Patent ID: 7106863
Filing Date: 2006-09-12
Classification: G01S

Abstract:
1. A method for satellite positioning using positioning signals which are sent out by the various satellites of a satellite constellation under the control of a set of ground stations from which said satellites receive control signals, and which are available to be picked up by a plurality of user receivers, comprising: emitting, from said set of ground stations, periodically renewed direct transformation functions which are addressed respectively to each satellite of said satellite constellation and applying the direct transformation function received by each satellite to encode the positioning signals emitted therefrom; verifying that a user receiver has a right to a privileged-user status upon each request from the user receiver addressed to a user servicing station and, in the event that the verification is positive, addressing to said user receiver reverse transformation functions that are inverse to the direct transformation functions applied at the satellites from which said user receiver receives positioning signals, wherein said reverse transformation functions include an interpretation key for interpreting said positioning signals by applying said reverse transformation functions for decoding them.