Thales

Hervé Guichon

Nicolas Martin

Marc Revol

Denis Bouvet

Bernard Fouilland

The invention concerns a satellite geopositioning method on the basis of satellites each transmitting dual-frequency signals. The method comprises, for each satellite, The position is estimated by using the corrected pseudo-distances computed for each satellite.

Satellite geopositioning method and associated terminal

A satellite-based positioning system reception device comprises a function for detecting false lock-ons based on a linear combination of complex signals arising from correlation pathways between a signal received from a satellite and a prompt local code and a plurality of local codes shifted by determined delays with respect to the prompt local code. An advantage is that the function for detecting false lock-ons makes it possible to remedy the false lock-ons due to multi-path phenomena.

Satellite-based positioning system reception device comprising a function for detecting false lock-ons

A satellite positioning receiver is disclosed having at least one receive channel. Each receive channel is intended to perform a combined processing of a first Sand a second Sradiofrequency signals separated in frequency. The signals are received by analogue paths of the receive channel then digitized to be processed in digital receive paths. Each receive channel has a first () and a second () correlation circuits, respectively receiving the first and the second received digitized signals. Carrier and code phase discriminators are common to both correlation circuits. A local code generator is provided for each code correlation path. The local codes are offset by a positive differential delay correction +&#x394;&#x3c4;for one of the correlation circuits and a negative differential delay correction &#x2212;&#x394;&#x3c4;for the other. These corrections tend to compensate for the relative delay difference between the two signals in the analogue paths of the receive channel. A phase differential correction device &#x394;&#x3c6;tends to compensate for the phase differential deviation between the two signals occurring in the analogue paths of the receive channel.

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Guilherand, France

Hervé Guichon