A: Unfortunately, uninterrupted use of GNSS navigation cannot be assured due to GNSS signal susceptibility to various disruptions. All GNSS systems rely on the ability to receive weak signals from thousands of kilometers away in space, making them vulnerable to Radio Frequency Interference (RFI). GN
Earlier this month, Standford University hosted its 17th annual PNT Symposium, with two days filled of presentations from student speakers and invited guests. Brad Parkinson was among the presenters, with his talk focusing on the important milestone reached in 2023: the 50-year anniversary of gainin
Increasing salt production and use is shifting the natural balances of salt ions across Earth systems, causing interrelated effects across biophysical systems collectively known as freshwater salinization syndrome. In this Review, we conceptualize the natural salt cycle and synthesize increasing global trends of salt production and riverine salt concentrations and fluxes. The natural salt cycle is primarily driven by relatively slow geologic and hydrologic processes that bring different salts to the surface of the Earth. Anthropogenic activities have accelerated the processes, timescales and magnitudes of salt fluxes and altered their directionality, creating an anthropogenic salt cycle. Global salt production has increased rapidly over the past century for different salts, with approximately 300 Mt of NaCl produced per year. A salt budget for the USA suggests that salt fluxes in rivers can be within similar orders of magnitude as anthropogenic salt fluxes, and there can
This research analyzes the wide-area 2022 Texas GPS jamming incident using data from airborne receivers through Automatic Dependent Surveillance - Broadcast (ADS-B) and ground receivers at Continuous Operating Reference Stations (CORS). ATHIEU JOERGER, CHENMING FAN, SANDEEP JADA, VIRGINIA TECH Wide-
Maliqa Deja Jack, 27, of the 400 block of Chestnut Street, Pottstown, was sentenced in Montgomery County Court to 11½ to 23 months in the county jail after she pleaded guilty to charges of corrupt organizations, dealing in proceeds of unlawful activities, making false statements, criminal use of a communication facility and illegal sale or transfer of firearms in connection with a gun trafficking organization that operated in Montgomery, Berks, Bucks, Lancaster and Philadelphia counties between June 2019 and February 2021.