Patent ID: 7081606

Claim:
A position measuring system, comprising a rotary laser system provided at a known point and for projecting a laser beam by rotary irradiation, an object to which said laser beam is irradiated, and a control arithmetic operation unit provided at at least one of said rotary laser system and said object, wherein said rotary laser system has a projection optical system for projecting the laser beam by rotary irradiation as a fan-shaped laser beam by spreading the laser beam in an up-to-bottom direction, an image photodetector which can identify a photodetecting position, and a photodetection optical system for guiding the laser beam reflected from said object toward said image photodetector, said object having a reflecting body to reflect the laser beam toward said rotary laser system, and a GPS position measuring unit for obtaining a position of said object, and wherein said control arithmetic operation unit calculates an elevation angle based on the photodetection position on said image photodetector and calculates a height of said reflecting body based on position information of said rotary laser system and based on the elevation angle.