Development Of Position Measurement System For Construction Pile Using Laser Range Finder

Development of Position Measurement System for Construction Pile Using Laser Range Finder Fumihiro Inoue Satoru Doi Abstract This paper describes the development of highly accurate and low-cost position measurement system with a laser range finder (LRF) and a cylindrical reference bar. The LRF is a laser apparatus that measures the distance of a target object; therefore, a measurement system analyzing a true target position using considerable data about the target arc was devised. In the proposed system, date was obtained using the LRF assuming a bar with arc-shaped contours, and the central position was studied using the least squares method and maximum likelihood estimation. As a result, the central position was located with an accuracy exceeding that of an LRF alone. Hence, a real-time position display system was developed. When this system is applied to the position measurement of a construction pile, it affords advantages such as ease of use, cost-efficiency, and working-hour efficiency because it is operated by only one worker.