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Radiation Principle and Spatial Direct Modulation Method of a Low Frequency Antenna Based on Rotating Permanent Magnet

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Chinese Journal of Electronics 2022年第4期31卷 674-682页

作者： LIU Wenyi ZHANG Feng SUN Faxiao GONG Zhaoqian LIU Xiaojun FANG guangyou Aerospace Information Research Institute Chinese Academy of Sciences Key laboratory of Electromagnetic Radiation and Sensing Technology University of Chinese Academy of Sciences

The theory of mechanical antenna is still in its infancy at present, and its radiation mechanism,field distribution, modulation methods and other basic theories need to be explored and improved. The radiation mechanism of a rotating-magnet based mechanical antenna(RMBMA) is explored. An equivalent radiation model of the mechanical antenna is established. The field formula of mechanical antenna is derived using this model and rotation matrix. The spatial direct modulation method of mechanical antenna is also investigated. Two prototype antennas are fabricated using DC/AC servo motors and Nd Fe B magnets, and experiments are carried out to verify the correctness of the derivation and analysis. The measured and simulated results are in consistent with each other. By precisely controlling the moving parameters of an AC servo motor, signal of binary amplitude shift keying(BASK) is generated, and the original code sequence is recovered by demodulation.

关键词： prototype antennas radiation mechanism binary amplitude shift keying Permanent magnets AC servo motor antenna radiation patterns Small and special purpose electric machines modulation methods demodulation servomotors rotation matrix rotating-magnet based mechanical antenna Single antennas Modulation and coding methods rotating permanent magnet amplitude shift keying low frequency antenna permanent magnets radiation principle magnetic fields equivalent radiation model code sequence spatial direct modulation method

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A Novel Iterative Velocity Control Algorithm and Its FPGA Implementation Based on Trigonometric Function

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Chinese Journal of Electronics 2019年第2期28卷 237-245页

作者： WEN Quangang LIANG Yanchun Adriano Tavares Ricardo Teixeira WU Chunguo Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education College of Computer Science and Technology Jilin University Zhuhai Laboratory of Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education Zhuhai College of Jilin University Department of Industrial Electronics University of Minho Campus de Azurm

The servo motor’s flexible acceleration/deceleration(acc/dec) control is an emerging research topic in the automation field. A velocity control algorithm based on trigonometric function is proposed in this *** required parameters, it transforms trigonometric calculations into elementary mathematical operations and calculates the velocity controlling values iteratively, which could avoid trigonometric calculation and reduce the computation time. Experimental results show that the proposed algorithm is suitable for implementation on field programmable gate arrays and achieves a flexible controlling, enhancing both the equipment’s stability and reliability. It is promising to significantly improve the high-speed computerized numerical control equipment’s controlling accuracy, without a huge hardware resource consumption.

关键词： Acceleration Velocity control Algorithm design and analysis Field programmable gate arrays servomotors

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