Patent ID: 9470988
Filing Date: 2016-10-18
CPC Classification: G03F

Claim Text:
1. A positioning system for positioning an object in a lithographic apparatus, the positioning system comprising: a first object table moveable in an operating area; a second object table moveable in the operating area; a first position measurement system configured to provide an incremental position measurement of the second object table relative to a reference when in the operating area, wherein the first position measurement system is configured to provide an absolute position measurement of the first object table relative to the reference; a second position measurement system configured to provide an absolute position measurement of the first object table relative to the second object table, and wherein the first position measurement system is further configured to provide an absolute position measurement of the second object table relative to the reference based on the absolute position measurement of the first object table relative to the reference and on the absolute position measurement of the first object table relative to the second object table.