It can do 1m resolution, and another mode can do 650km width.(Continued from above...)
The Gaofeng-3 SAR observational satellite can achieve a resolution of five meters and an imaging width of 120 kilometers, also capable of moving target detection and high-precision ocean current field measurement. Together with two other Gaofeng-3 satellites, the constellation enables continuous monitoring of global ocean environments, reducing the average revisit time from 0.6 days for a single satellite to 0.2 days, and the average revisit period has been shortened from 15 hours for a single satellite to 5 hours. The three satellites together can monitor nearly 20% of the world's oceans in one pass.
China's Space Program News Thread
- Thread starter crazyinsane105
- Start date
- Status
- Researchers at a military laboratory say their system can both spot and fix problems that leave satellites vulnerable to cyberattacks
- Cyber defence system is needed given the increase in the number of satellites in orbit and the increasing risk from hackers, according to scientists
There are limitations to this approach. You can't vector a missile with a satellite, so you are still reliant on ground radar, AWAC, and eventually fighter aircraft to eventually get the job done. You also probably need many satellites to keep tabs on stealth aircraft. However, the job is easier in the West Pacific due to the limited number of airports.
Wikipedia list the mass of the Chinese telescope at 15,000kg, while Hubble is only 11,0000kg. Both have the essentially the same diameter primary mirror, while the Chinese scope has a shorter tube and shorter focal length. Why is the Chinese scope so much heavier? What additional capability or instrumentation is it carrying?
You can't with A satellite, but you can with a constellation. Jilin-1 is such constellation with 40 satellites in orbit now. Not only Jinlin but other SSO surveillance satellite constellations such as 高景(SuperView) are arranged in the way so that there is multiple satellites over the area from different angles, so you can triangulate the vector of the moving object. In Jilin-01 constellation for example, Jilin-01 Gaofen 3D, 3E and 2B are spaced apart like the following picture. The more satellites you have in various orbits and spaced in time, the better. I remember that one of such constellations is to be made by 120 satellites when finished.
Xuntian is a telescope + propulsion module + docking mechanism, essentially a miniature autonomous space station in its own right. Hubble is just a telescope. Xuntian can dock to CSS and be serviced and refuelled. It has the capability of orbit keeping by itself.
That is why I love China's science and technology. China's young scientists and engineers are daring to innovate. That I believe is one of the reasons why the China Xuntian telescope is far superior than the Hubble. Just look at its specification.
- Status