Russia Is Jamming GPS Satellite Signals In Ukraine, US Space Force Says

An anonymous reader quotes a report from Space.com: Another piece of space infrastructure for Ukraine is under attack, according to an NBC report. Jammers from Russian forces besieging the country are targeting global positioning system (GPS) satellite signals that are used for navigation, mapping and other purposes, the report said, quoting the U.S. Space Force. "Ukraine may not be able to use GPS because there are jammers around that prevent them from receiving any usable signal," Gen. David Thompson, the Space Force's vice chief of space operations, told NBC Nightly News Monday (April 11). "Certainly the Russians understand the value and importance of GPS and try to prevent others from using it," Thompson added. He noted that Russia has not directly attacked any satellites in orbit, but the Space Force is keeping an eye out for such possibilities. Specifically, Russia is targeting the Navstar system of satellites used by the United States and made available openly to many countries around the world, Thompson said. (Russia has its own independent system, called GLONASS, while the Europeans have one called Galileo and China has one called Beidou.) Navstar uses 24 main satellites that each orbit the Earth every 12 hours. The system works by sending synchronized signals to users on Earth. Because the satellites move in different directions, the user receives their signals at slightly different times. When four satellites are available, GPS receivers can use their signals to calculate the user's position, often to within just a few feet. In late February shortly after Russia's invasion of Ukraine began, SpaceX's Starlink satellites were activated over the country to help restore internet services destroyed by the Russians. SpaceX CEO Elon Musk later warned that Starlink user terminals in Ukraine could be targeted by Russia and advised users to take precautions.

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