Obstacle’s Positioning Strategy by Using Presetting Points forUltrasonic Guiding System

• Main Authors: Nan-Shin Low, 劉南興
• Other Authors: 盧樹台
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/76690837604949410920

碩士 === 健行科技大學 === 資訊工程所 === 101 === This paper aims to propose a novel positioning strategy of an ultrasonic guiding system for the blind. Many presetting points are located in the effective measurement area of the guiding system. After three ultrasonic receivers catch the echo signals reflected from an obstacle under detection, only simple mathematical calculations and comparison of three clock sets with the presetting points are required to find the position of the obstacle. The presetting points would be candidates for obstacle position if the errors of the three clock sets are all within acceptable margins. This proposed strategy could solve the serious positioning problem in Newton-Raphson iteration method, which is due to a little clock error. Besides, the strategy can be implemented more easily in an embedded system, which is less available for mathematical calculations.