Patent ID: 7205521
Filing Date: 2007-04-17
Classification: G01P,G01S,G06F

Abstract:
1. An optical navigation system, comprising: a first light source operable to produce a coherent first light beam for illuminating a target surface; a second light source operable to produce a second light beam for illuminating the target surface; a first detector operable to produce first optical data in response to receipt of a reflection of the first light beam from the target surface; a second detector operable to produce second optical data in response to receipt of a reflection of the second light beam from the target surface; and a processor operable to determine from the first optical data a first displacement measure corresponding to a displacement of a pattern imaged by the first detector, determine from the second optical data a second displacement measure corresponding to a displacement of a pattern imaged by the second detector, and calculate a distance to the target surface from the first and second displacement measures.