Patent ID: 7715998
Filing Date: 2010-05-11
Classification: G01C

Abstract:
1. A surveying instrument, comprising a horizontal angle detector for detecting horizontal angle, an elevation angle detector for detecting elevation angle, a dynamic displacement detecting means for detecting posture displacement of a surveying instrument main unit in two horizontal directions, and a calculating unit, wherein said dynamic displacement detecting means detects displacement with respect to standard posture of the surveying instrument main unit, said calculating unit calculates horizontal angle and elevation angle corresponding to dynamic displacement detected by said dynamic displacement detecting means, and the horizontal angle and the elevation angle obtained by said horizontal angle detector and said elevation angle detector respectively based on the calculated horizontal angle and the calculated elevation angle, and wherein said dynamic displacement detecting means comprises two sets of image pickup units which are provided on said surveying instrument main unit, wherein optical axes of said two sets of image pickup units are arranged to perpendicularly cross each other in a horizontal plane, and wherein said calculating unit acquires two image data before and after the transition of time by each of the image pickup units, obtains dynamic displacement of the surveying instrument main unit by a comparison of said two image data, and calculates the horizontal angle and the elevation angle corresponding to dynamic displacement, and compensates the horizontal angle and the elevation angle obtained by said horizontal angle detector and said elevation angle detector based on the calculated horizontal angle and the calculated elevation angle.