Patent ID: 7684011

Claim:
A calibration method for calibrating a position of a substrate table in a lithographic apparatus, the method comprising: providing a substrate on the substrate table, the substrate including a two dimensional arrangement of patterns on a surface thereof; positioning the substrate table with a positioning system; measuring positions of the substrate table in at least two dimensions with a position measurement system; reading out the arrangement of patterns on the substrate as a function of the measured positions of the substrate table with a pattern read out system to obtain pattern read out results; deriving position errors as a function of the measured positions of the substrate table compared with the pattern read out results; and calibrating the positioning system using the position errors, the calibrating including determining drift influences of the positioning system, which determined drift influences are used to correct the position errors as a function of the corresponding two dimensional positions of the substrate table, and wherein the corrected position errors are used to calibrate the positioning system.