  Construction of EUDET pixel telescope will significantly improve the test
beam infrastructure for the ILC vertex detector studies. The telescope, based
on the Monolithic Active Pixel Sensors (MAPS), will consist of up to six
readout planes and will be initially installed at an electron beam line at
DESY. A dedicated study was performed to understand the position measurement in
the telescope and optimize its performance by suggesting the best plane setup.
The approach based on the analytical track fitting method allows for
determination of the expected measurement uncertainty and for comparison of
different telescope setups without time consuming event simulation. The
proposed method also turns out to be little sensitive to the possible telescope
misalignment.
