Thales Management & Services Deutschland Gmbh

Sébastien Bomart

André Schüttpelz

Ulrich Kälberer

Arberita Kusari

Frieder Beck

A test metric for satellite sent GNSS code signals is proposed, wherein a signal sent by each satellite i is received at different GNSS receivers, and bias-removed, averaged over the receivers and normalized measurement values are derived out of autocorrelation function values. A correlation matrix Ris built from a matrix Xcontaining the measurement values in the form of measurement value vectors {right arrow over (X)}from the present time epoch tand from previous time epochs twith k=1, . . . , n&#x2212;1, wherein a principal component analysis is done of matrix R, wherein a transformed vector {right arrow over (T)}=PC&#xb7;{right arrow over (X)}is calculated, with PCcontaining at least two eigenvectors having the largest eigenvalues of all eigenpairs. A signal quality monitor test metric SQMis built from the square sum of the entries of transformed vector {right arrow over (T)}, and if SQMis larger than a threshold THR, the satellite signals are disallowed for position determination at all GNSS receivers.

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Strasbourg, France

Sébastien Bomart