Research on Large-capacity and Long-distance SAW Tags

Abstract

Abstract: Based on the pulse amplitude and pulse position coding, a phase stepping pulse position coding scheme was designed,and the time slots and phases were extracted by digital quadrature demodulation method. The coding capacity is close to 3 million,which may meet the needs of most applications.The relationships between echo amplitudes and reflectivity of reflectors of single-channel and dual-channel SAW tags were compared through theoretical derivation and simulation analyses.The results show that for the two type of tags with the same number of reflective gratings,the dual-channel tags may select a higher reflectivity of the reflective grating,thus having a farther recognition distance.The corresponding SAW tags were actually fabricated and tested.The test results verify the large-capacity and long-distance characteristics of the dual-channel tags with phase stepping pulse position coding.

Key words: surface acoustic wave tag(SAW), phase stepping pulse position coding, digital quadrature demodulation, dual-channel, reflectivity

摘要：

在脉冲幅度、脉冲位置编码的基础上，设计了相位步进脉冲位置编码方案，通过数字正交解调方法提取时隙和相位信息，其编码容量接近300万，可满足大多数应用场合的需求。通过理论推导和仿真分析对比研究了单通道与双通道声表面波标签的回波幅值与反射栅反射率之间的关系，结果表明，对于反射栅数量相同的两种标签，双通道标签可以选取更高的反射栅反射率，从而具有更远的识别距离。实际制作了相应的声表面波标签并进行了测试，测试结果验证了采用相位步进脉冲位置编码双通道标签的大容量和远距离特点。

关键词: 声表面波标签, 相位步进脉冲位置编码, 数字正交解调, 双通道, 反射率

CLC Number:

TN65

JIA Hao1;CHEN Zhijun1;XU Hailin2;LI Yafei1. Research on Large-capacity and Long-distance SAW Tags[J]. China Mechanical Engineering.

贾浩1;陈智军1;徐海林2;李亚飞1. 大容量远距离声表面波标签研究[J]. 中国机械工程.

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