Patent ID: 7633609
Filing Date: 2009-12-15
Classification: G01C,G01S

Abstract:
1. A measuring system, comprising a surveying instrument for projecting a laser beam by rotary irradiation and a photodetection sensor device installed at a measuring point, wherein said surveying instrument comprises a first radio communication unit, said photodetection sensor device comprises a second radio communication unit, and communication can be performed between said surveying instrument and said photodetection sensor device, wherein said surveying instrument comprises an angle detecting means for detecting a horizontal angle in a projecting direction of the laser beam and a first arithmetic unit for controlling said angle detecting means based on a receiving signal from said first radio communication unit, and said photodetection sensor device comprises a photodetection unit for receiving the laser beam and a second arithmetic unit for performing transmission of a photodetection notifying signal to notify the receiving of the laser beam by said photodetection unit and also for performing transmission of synchronization data including a signal processing delay between said surveying instrument and said photodetection sensor device by said second radio communication unit to said first radio communication unit, wherein said first arithmetic unit calculates a horizontal angle of the projection of the laser beam when said photodetection sensor device receives the laser beam based on the photodetection notifying signal and the synchronization data.