POSITIONING SYSTEM INCLUDING A MECHANISM FOR DETECTING FRAUD BY CHECKING THE VISIBILITY OF SATELLITES
First Claim
1. A positioning system comprising at least one onboard GNSS satellite receiver in a mobile element belonging to a user u, said receiver having the function of estimating the position Xu of said mobile element at various instants, a processing module determining a consistency indicator coh(X) by analysis of the signals received by the GNSS receiver, said indicator being representative of the difference between the visibility of the satellites used for the estimation of position Xu[t] by the receiver and the expected visibility at this position.
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Abstract
A positioning system comprises at least one onboard GNSS satellite receiver in a mobile element belonging to a user u, said receiver having the function of estimating the position Xu of said mobile element at various instants, a processing module determining a consistency indicator coh(X) by analysis of the signals received by the GNSS receiver, said indicator being representative of the difference between the visibility of the satellites used for the estimation of position Xu[t] by the receiver and the expected visibility at this position.
15 Citations
6 Claims
- 1. A positioning system comprising at least one onboard GNSS satellite receiver in a mobile element belonging to a user u, said receiver having the function of estimating the position Xu of said mobile element at various instants, a processing module determining a consistency indicator coh(X) by analysis of the signals received by the GNSS receiver, said indicator being representative of the difference between the visibility of the satellites used for the estimation of position Xu[t] by the receiver and the expected visibility at this position.
Specification