Multipath mitigation gnss receiver
AssigneeNemerix SA
InventorJoel BRENNER
Life of this patent
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Abstract
An improved GNSS or GPS receiver with a code-tracking loop comprising a plurality of correlators, arranged to extract a plurality of samples of the autocorrelation function of the C/A code, and a discriminator performing linear regression on both sides of the autocorrelation peak, to determine the autocorrelation peak position at the crossing point of two straight lines. The lines are independently adapted to the sides of the correlation peak and, therefore, the receiver can handle well multipath situations, in which the correlation peaks are distorted.
Claims13
GNSS Receiver for decoding a radio signal modulated by at least one frequency-spread code, the receiver having at least one code tracking loop, for tracking the phase of said frequency-spread code, comprising a plurality of correlators arranged to sample the autocorrelation function of the frequency-spread code modulated in the radio signal, the code tracking loop comprising in addition a discriminator to determine the phase of the frequency-spread code, the discriminator being arranged to compute parameters of a triangle approximating the shape of a peak in said autocorrelation function, and to determine the phase of said frequency-spread code from the position of the vertex of said triangle.
The receiver of the previous claim, further arranged to correct the phases at which said correlators sample the autocorrelation function, according to the determined phase of said frequency-spread code in order to close the code tracking loop.
Dependencies are inferred from the claim text.