Effect of Receiver Position Deviations on Ultrasonic Positioning System

• Main Authors: Hung-Hsing Chi, 紀鴻星
• Other Authors: Shun-Tai Lu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/66369068660092396314

碩士 === 清雲科技大學 === 電機工程研究所 === 97 === An ultrasonic guiding system for the blind people is introduced in this thesis. The system has three ultrasonic receivers and an ultrasonic emitter. Three receivers are located at different apexes of a right triangle and an ultrasonic emitter is located at center of hypotenuse. With the circuits of emitter and the sensors, obstacles in front of the blind can be detected by using time-of-flight of the ultrasonic wave. As the system is assembled, the position deviations of emitter and receivers may cause positioning errors. The main subject of this thesis is to find out how serious the positioning error is. A cone with angle of ±15°, 1 meter to 2 meters in front of the reveivers has been evaluated as a test region for the system. Simulation results regarding ±1 to ±2 mm position deviations in x direction and y direction of the receiver are given in this thesis.