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Shi F.,Tianjin Polytechnic University | Shi Y.,Tianjin Zhonghuan Innovation Science and Technology Co. | Su H.,Tianjin Zhonghuan Innovation Science and Technology Co. | Chen G.,Tianjin Zhonghuan Innovation Science and Technology Co. | And 2 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

The pulley movement information collection system used effective detection method to collect real-time and precise information of pulley movement, providing feedback data for the space motion simulation platform. The system was based on high-performance microcontroller, and took CPLD as an auxiliary, used high-precision optical encoder to assist microcontroller in acquiring accurate speed of the pulley. Using infrared photoelectric sensor to roughly measure the location of the pulley and optical encoder to precisely measure the location of the pulley, precise location information was obtained with combination of both. This system used precision timer in the microcontroller to obtain the current time information and ZigBee wireless communication module to send the trigger signal from the pulley to microcontroller. Microcontroller sent the data to computer and control unit with the specific communication protocols. The computer and control unit analysed state of the pulley through the data to achieve control of the pulley. The space motion simulation platform has use value and practical significance in teaching and research. Source

Shi F.,Tianjin Polytechnic University | Liu W.,Tianjin Zhonghuan Innovation Science and Technology Co. | Wang X.,Tianjin Jinhang Institute of Technical Physics | Ding J.,Tianjin Zhonghuan Innovation Science and Technology Co. | And 2 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2015

With the rapid development of micro aerial vehicle technology and mobile robots technology, the requirements for indoor navigation technology are becoming higher and higher, but navigation presence is low and equipment is relatively complex in indoor navigation system. To address this problem, an indoor active navigation method that combines laser radar positioning and geomagnetic sensors measurement was proposed. First, laser radar was used to scan the indoor environment, the map be constructed by collected data, the route be planed based on the destination information and the indoor environment information; and then the data which was obtained by laser radar continuously scanning environment was compared with the map data when the vehicle was traveling, the location was determined, direction of travel was obtained by geomagnetic sensor, whether the vehicle was on the right road was determined by the combination of position and direction of travel, the deviation will be corrected in time; last, whether arriving at designated location was determined by searching RFID landmarks. Simulation and experimental results show that the indoor laser radar navigation system is simple and the reliability is high, which meet the requirements of indoor navigation. © 2015, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved. Source

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