Survey system

A survey system comprising:

• a surveying instrument including
• a survey unit having a light emitting element to transmit distance-measuring light to a target and a light receiving element to receive the distance-measuring light reflected, and configured to measure a distance and angles of the target,
• a tracking unit having a light emitting element to transmit tracking light to the target and a light receiving element to receiving the tracking light reflected, and configured to detect a position of the target and automatically track the target,
• a telescope storing optical systems of the survey unit and the tracking unit,
• a horizontal rotation driving unit configured to rotate the telescope in the horizontal direction and a vertical rotation driving unit configured to rotate the telescope in the vertical direction,
• an imaging unit configured to acquire an image of a landscape in front of the telescope, and
• at least one first processor configured to control the survey unit, the tracking unit, the horizontal rotation driving unit, the vertical rotation driving unit, and the imaging unit;
• a controller including a GNSS device configured to acquire position information of the device itself based on a navigation signal, and at least one second processor configured to remotely operate the surveying instrument;
• and
• a target unit including the target and an optical transmitter configured to emit tracking guide light, wherein
• the first processor and the second processor are capable of communicating with each other, and function as a system control unit,
• the system control unit is enabled to calculate an azimuth of the GNSS device at an arbitrary point with respect to the surveying instrument based on position information acquired by the GNSS device at a first point away from an installation point of the surveying instrument, position information acquired by the GNSS device at a second point away from the first point, and an angle between the first point and the second point with respect to the surveying instrument acquired by respectively measuring angles of the target set at the first point and the second point by the surveying instrument,
• the system control unit rotates the telescope in the horizontal direction toward the GNSS device based on a difference between an azimuth of the GNSS device at a current position with respect to the surveying instrument calculated from position information acquired by the GNSS device at the current position, and an azimuth of a current collimation direction of the telescope,
• the first processor causes the imaging unit to acquire images when the optical transmitter turns off light and turns on light, calculates an arrival direction of the tracking guide light from a difference image between the images, and rotates the telescope toward the arrival direction, and
• by scanning the periphery by the tracking unit, the first processor captures the target and locks on the target.