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

• Main Authors: SCHUETTPELZ, ANDRE, KAELBERER, ULRICH, BOMART, SEBASTIEN, BECK, FRIEDER, KUSARI, ARBERITA
• Format: Patent
• Language: English; French
• Published: 08.02.2020
• 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 R i,n is built (130) from a matrix X i,n containing the measurement values in the form of measurement value vectors X i,k from the present time epoch t n and from previous time epochs t k with k=1,...,n-1, wherein a principal component analysis is done (150) of matrix R i,n, wherein a transformed vector T i,n = PC T i,n .cndot. X i,n is calculated (160), with PC i,n containing at least two eigenvectors belonging to eigenpairs having the largest eigenvalues of all eigenpairs, wherein a signal quality monitor test metric SQM i,n is built (170) from the square sum of the entries of transformed vector T i,n, and wherein if SQM i,n is 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.