NASA satellites built to study hurricanes, ice, and Earth\u2019s changing surface have shown an unexpected talent. A recent comparison found that two Earth-observing systems could help trace a GPS jammer near Shiraz, Iran, not to a street address, but to within a few miles.<\/p>\n\n\n\n
That matters because GPS<\/a> is more than the blue dot on a phone map. Aircraft, cargo ships, emergency crews, banking networks, and power grids all depend on satellite navigation or timing, so a blocked signal can ripple into cockpits, ports, and everyday life.<\/p>\n\n\n\n CYGNSS<\/a> was never designed as a jammer-hunting system. NASA\u2019s Cyclone Global Navigation Satellite System uses eight small satellites to measure ocean winds inside tropical cyclones<\/a>, with reflected GPS signals helping it see through heavy storm rain.<\/p>\n\n\n\nA weather mission spots a security problem<\/h2>\n\n\n\n