The China Aerospace Science and Technology Corporation (CASC) is the main contractor for the Chinese space program. It is state-owned and has a number of subordinate entities which design, develop and manufacture a range of spacecraft, launch vehicles, strategic and tactical missile systems, and ground equipment. It was officially established in July 1999 as part of a Chinese government reform drive, having previously been one part of the former China Aerospace Corporation. Various incarnations of the program date back to 1956.
On April 24, 2015, China and Brazil have signed the agreement for the construction of CBERS-4A. It's a third satellite in the continuity to the CBERS program, and a sixth CBERS satellite to be constructed. The CBERS satellites enhance and complement the existing remote sensing systems in an effort to improve our knowledge about the Earth environment and resources.