Tianyi 51-52

Kuaizhou-11 carried two C-band radar satellites that work as an interferometric pair to measure ground deformation, built by commercial satellite maker Spacety. They were the first commercial satellites of their kind in a medium-inclination orbit. At 55°, the pair can revisit a site daily and measure movement in three dimensions, including north-south motion that is hard to capture from the sun-synchronous orbits such satellites usually fly.