| 摘要 |
A method (300) for determining relative movement between an optical navigation device and a navigation terrain includes generating (303) two overlapping coherent optical beams (204, 206, 236a, 236b), and generating (304) a pattern of interference fringes (237) between the two overlapping optical beams. The method further includes illuminating (305) a surface portion (22, 212) of the navigation terrain with the pattern of interference fringes, imaging (306) a fringe illuminated surface portion, and generating (306-307) a pattern of signals 114 in response to the imaged fringe-illuminated surface portion. ® KIPO & WIPO 2007
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