Patent ID: 8675713

Claim:
A satellite-based positioning system reception device, comprising at least one reception channel configured to process a received digitized signal originating from a microwave signal emitted by a determined satellite offering an inherent spreading code, each reception channel comprising at least: means for generating a local carrier, means for demodulating the received digitized signal received by the local carrier, means for generating a prompt local code corresponding to the said satellite spreading code, the generating means also generating a plurality n of local codes shifted with respect to the prompt local code by nonzero delays d i , correlation means configured to determine signals representative of coefficients of correlation between the signal received demodulated by the local carrier and the local codes forming as many correlation pathways, the signals restored by the said correlation means being processed by a correlation integrator providing complex signals Z i corresponding to respective correlation pathways, each reception channel further comprising means for determining a function for detecting false lock-ons which is determined on the basis of the said complex signals according to the relation: Detector = Re ⁡ [ Z I · Z _ P ]  Z P  2 , in which Z P designates the complex signal arising from the pathway for correlating the received digitized signal with the prompt local code, and Z I designates a linear combination of the said complex signals Z i associated with respective weighting coefficients α i , the said delays d i and weighting coefficients α i satisfying the following relation: { ∑ i = 1 i = n ⁢ α i = 0 ∑ i = 1 i = n ⁢ d i · α i = 0.