Gaofen-4 can continuously observe a disaster because it moves synchronously with the Earth
China’s first high-orbit remote sensing satellite, Gaofen-4, has been activated after six months of in-orbit testing, the State Administration of Science, Technology and Industry for National Defense (SASTIND) announced on Monday.
Gaofen-4 is China’s first geosynchronous orbit high-definition optical imaging satellite and the world’s most sophisticated, Xinhua reported.
Unlike Gaofen-1 and Gaofen-2 in low-orbits around the Earth, Gaofen-4 is orbiting at 36,000 km. High-orbit satellites have the advantage of being able to photograph “grand scenarios”. Low-orbit satellites, in contrast, can see more detail at faster speed.
Low-orbit satellites cannot always follow natural disasters, but Gaofen-4 can continuously observe a disaster because it moves synchronously with the Earth.
It improves the response to disasters like earthquakes, landslides and typhoons with its high-precision sensors.
Gaofen-4, which was launched in December 2015, has a designed lifespan of eight years, compared to other remote sensing satellites which remain in service for less than three to five years.