Fast software routines convert the correlation signals to actuator signals for the tip/tilt mirror, performing the pointing correction, image stabilization and guiding. The closed-loop control of the image stabilization system has a bandwidth of about 60 Hz (at the 6 dB level) with a sensitivity of better than 0.003 arcsec. It provides very efficient damping of low frequencies where the pointing control cannot be provided solely by the gondola.
During its successful flight in 2009, the SUNRISE telescope had by far the highest pointing stability ever achieved on a balloon-borne telescope.
The CWS unit was developed by the Kiepenheuer-Institut für Sonnenphysik, Freiburg, Germany.