Program: Tianhui

Chinese mapping satellite program, operated by the military.

Built by DFH Shenzhen.

In a scientific paper, Chinese officials said the Tianhui 2 satellites are similar to the German TerraSAR X and TanDEM X radar observation satellites. The use of two satellites flying in formation yields stereo data critical to generate 3D maps.

Tianhui 1 satellites are believed to be optical radard than radar.

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