Submitted by Serge MEIMON
S. Meimon, T. Fusco, C. Petit
ONERA
We adress the design of the low order wave front sensor for the ATLAS system. This sensor will use natural guide stars and will have to compensate both for turbulence and windshake components. We compare classical integrator and Kalman filter strategies, and provide the first trade-off obtained in the E-ELT case.