Patent ID: 7966739
Filing Date: 2011-06-28
Classification: G01C,G01S

Abstract:
1. A laser surveying system, comprising a rotary laser projecting device and an object reflector, wherein said rotary laser projecting device comprises a reference plane forming unit for forming a reference plane by projecting two or more fan-shaped laser beams which spread in vertical direction and at least one laser beam which is tilted, a distance measuring unit for measuring distance by projecting distance measuring light, a rotator for projecting said fan-shaped laser beams and said distance measuring light in horizontal direction by rotary irradiation, a horizontal angle detecting unit for detecting horizontal angle of the rotator, a photodetection unit for receiving the reflected fan-shaped laser beams and the reflected distance measuring light, a storage unit, and a control arithmetic unit for controlling said reference plane forming unit, said distance measuring unit and said rotator and wherein said object reflector reflects said fan-shaped laser beams and said distance measuring light toward said rotary laser projecting device, wherein said control arithmetic unit measures elevation angle of said object reflector from time difference of photodetection between said two or more laser beams, measures horizontal angle of the object to be measured based on the result of detection of said horizontal angle detecting unit when at least one of said reflected fan-shaped laser beams and said reflected distance measuring light is received and said distance measuring unit measures a distance to the object to be measured, and wherein said control arithmetic unit prepares a standard clock signal and performs matching of said standard clock signal with an angle signal from said horizontal angle detecting unit, determines time when said reflected distance measuring light is received, and based on the measured distance, calculates the time of reciprocal running of the distance measuring light between the object to be measured and a distance measuring unit, and calculates horizontal angle of the object to be measured by the time of reciprocal running when said reflected distance measuring light is received and from the matching of the standard clock signal with said angle signal.