LIGHT TRANSMITTER, SURVEY SYSTEM, AND METHOD FOR AUTOMATICALLY RESUMING TRACKING

Provided is a light transmitter that automatically directs a light transmission port to a surveying instrument. A light transmitter includes a transmitter main body configured to transmit tracking guide light, a drive unit, an inertial measurement unit, an angle detector, a transmitter communication unit, and a transmitter control unit, in which the light transmitter control unit causes the light transmitter communication unit to receive a horizontal direction angle of a surveying instrument, calculates a difference between a light transmission direction of the tracking guide light and an azimuth angle to the surveying instrument as an angle from the measured value of the inertial measurement unit and the measured value of the angle detector, and rotatably drives the drive unit such that the light transmission direction of the tracking guide light is directed to the surveying instrument to transmit the tracking guide light.