This paper addresses the problem of detecting external threats such as multipath and interference signals, which may compromise the integrity of Global Navigation Satellite System (GNSS) receivers. We will focus herein on multi-antenna GNSS receivers, for which detection metrics will be proposed in order to capture the change behavior of the threat under analysis. For a prompt threat detection, we adopt quickest detection techniques such as the CUSUM algorithm, and we validate their performance through numerical simulations.
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