基于CIDT的声表面波标签防碰撞编码设计  

Design of Anti-collision Code of Surface Acoustic Wave Tag Based on CIDT

作　　者：黄鸿伟 陈智军[1] 钟悦芸 朱卫俊[2] 徐辅庆 HUANG Hongwei;CHEN Zhijun;ZHONG Yueyun;ZHU Weijun;XU Fuqing(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;CETC Deqing Huaying Electronics Co,Deqing 313200,China)

机构地区：[1]南京航空航天大学自动化学院,江苏南京211106 [2]中电科技德清华莹电子有限公司,浙江德清313200

出　　处：《压电与声光》2020年第1期51-56,共6页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51475240)

摘　　要：在分析相关叉指换能器的防碰撞原理基础上,通过相关函数,以编码的自相关、互相关特性为指标,基于伪随机码Gold序列与Walsh序列搜索获得了两组各包含8个序列的相位编码。建立了相关叉指换能器的δ函数模型以仿真其传递函数,对采用两组相位编码的相关叉指换能器的声表面波响应信号进行了分析。研究表明,基于Walsh序列编码的相关叉指换能器具有更好的防碰撞性能,与自相关相比,编码的互相关对防碰撞性能起着更关键的作用。On the basis of analyzing the anti-collision principle of the correlation inter-digital transducer(CIDT),by using correlation function and taking the autocorrelation and cross-correlation characteristics of the codes as indicators,two sets of phase codes which respectively containing eight sequences were obtained from the search through the pseudo-random code Gold sequences and Walsh sequences.The δ function model of the CIDT was established to simulate its transfer function and the surface acoustic wave response signals of the CIDTs encoded by the two sets of phase codes were analyzed.The research shows that the CIDTs encoded by Walsh sequences have better anti-collision performance,which indicates that the cross-correlation of codes plays a more critical role in anti-collision performance compared with the autocorrelation codes.

关 键 词：防碰撞 相位编码 相关叉指换能器 GOLD序列 Walsh序列 

分 类 号：TN65[电子电信—电路与系统]