A METHOD FOR OPERATING A PLURALITY OF GNSS RECEIVERS FOR DETECTING SATELLITE SIGNAL DEFORMATION

• Main Authors: KÄLBERER, Ulrich, KUSARI, Arberita, SCHÜTTPELZ, André, BOMART, Sébastien, BECK, Frieder
• Format: Patent
• Language: English; French; German
• Published: 21.10.2020
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

In conclusion, the present invention proposes a test metric for GNSS code signals received at GNSS receivers (1-4), wherein for each satellite i, a signal sent by that satellite i is received at the different GNSS receivers (1-4), and bias-removed, averaged over the receivers and normalized measurement values are derived out of autocorrelation function values (110, 120) from the received GNSS code signals, wherein a correlation matrix Ri,nis built (130) from a matrix Xi,ncontaining the measurement values in the form of measurement value vectorsXi,kfrom the present time epoch tnand from previous time epochs tkwith k=1,...,n-1, wherein a principal component analysis is done (150) of matrixRi,n, wherein a transformed vectorT→i,n=PCi,nT⋅X→i,nTis calculated (160), withPCi,ncontaining at least two eigenvectors belonging to eigenpairs having the largest eigenvalues of all eigenpairs, wherein a signal quality monitor test metric SQMi,nis built (170) from the square sum of the entries of transformed vectorTi,n, and wherein if SQMi,nis larger than a threshold THR, the signals of satellite i are disallowed (190) for position determination at all GNSS receivers (1-4). The invention allows monitoring GNSS code signals with respect to satellite signal deformation with an improved integrity and continuity.