  GAW is a "path-finder" experiment to test the feasibility of a new generation
of Imaging Atmospheric Cherenkov telescopes that join high flux sensitivity
with large field of view capability using Fresnel lens, stereoscopic
observational approach, and single photon counting mode. GAW is an array of
three telescopes that will be erected at the Calar Alto Observatory site
(Spain, 2150 m a.s.l.). To evaluate the performance of GAW, a consistent
data--set has been simulated, including a Crab-like source observation, and a
proper image analysis code has been developed, as described in this
contribution. The expected performance of GAW are also reported, mainly for
what concerns effective area, angular resolution, Cherenkov flux as function of
the core distance, ability in the gamma/proton separation, and sensitivity. The
first telescope realization, foreseen within the end of this year, will allow
to verify if the parameters used in the analysis are in agreement with the
"real" performance of the GAW apparatus.
