| 摘要 |
A GPS(Global Positioning System) type reference point correction system for checking terrain change is provided to correct a reference point according to changes in vertical position of the reference point by using a laser where a transparent window through which laser beam transmits is automatically washed by a washer. A GPS type reference point correction system for checking terrain change includes a pile(10), a main survey unit(20), a detector(30), a washer, and a wireless terminal. The pile is fixed down to a hard foundation exposing the upper part thereof over the ground. The main survey unit is installed on the pile and generates laser beams for survey. The detector is installed on the upper part of a reference point(3) and receives the laser beam from the main survey unit for calculating a received position of the laser beam. The washer, including a heater, an ultrasonic oscillation device and a washer controller, is installed on the main survey unit and the detector and washes transparent windows of the main survey unit and the detector. The wireless terminal communicates with the main survey unit.
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