[Summary provided by the Brazil National Institute for Space Research (INPE), http://www.cbers.inpe.br/en/programas/cbers3-4.htm
Due to the success of CBERS-1 and 2, the two governments decided, ... in November 2002, to give continuity to the CBERS program by signing a new agreement for the development and launch of two more satellites, CBERS-3 and 4.
Brazilian participation in this program will be enlarged up to 50%, thus taking Brazil to a condition of equality with its partner. CBERS-3 is expected to be launched in 2009, CBERS-4 in 2011.
CBERS-3 and 4 satellites represent an evolution of CBERS-1 and 2. Four cameras will be present in the payload module, with improved geometrical and radiometric performance.
They are: PanMux Camera-PANMUX, Multi-spectral Camera-MUXCAM, Scanning Medium Resolution Scanner-IRSCAM and Wide Field Imaging Camera-WFICAM.
The orbits of the two satellites will be the same as for CBERS-1 and 2.