China’s 22,370-mile declassified spy satellite alarms US after 18-month secret reveal

Chinese scientists have officially disclosed the sophisticated technology behind Ludi Tance 4-01, the world’s first geosynchronous orbit synthetic aperture radar (SAR) satellite. Deployed in August 2023, Ludi operates at an altitude of 22,370 miles (36,000 km), granting China persistent surveillance over one-third of the Earth’s surface. This high-altitude system significantly surpasses US radar satellites, which remain confined to low Earth orbit. More

(Source: Interesting Engineering - Feb 28)