The dependency on position, navigation, and timing (PNT) has become increasingly important to Critical Infrastructure sectors such as communications, energy, transportation, emergency services, financial services, and cloud data centers. This dependency has resulted from the ubiquitous availability of PNT through the deployment of sky-based delivery using Global Navigation Satellite System (GNSS) systems such as GPS, Galileo, GLONASS, BeiDou, and others. To guide operators of Critical Infrastructure, published best practice documents by the Department of Homeland Security (DHS) Science and Technology Directorate (S&T) have described a number of steps that can be taken to mitigate outages and disruptions with GPS reception, thus improving its PNT resiliency.
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