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声表面波标签的相参阅读器设计

Design of Coherent Reader for Surface Acoustic Wave Tag
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摘要 现有与声表面波标签匹配的阅读器通常采用非相参的超外差结构,并通过开关截断以产生激励脉冲信号。由于开关闭合时刻和本振信号初相位的随机性,该方案所测回波相位为一个不确定的值,无法与距离等待测量建立函数关系。本文设计了一种相参阅读器,在发射链路使用功分器将信号源产生的信号分为两路同相信号,并把其中一路引入接收链路的下混频器作为本振信号,由此可使回波相位为一确定值。实际制作了阅读器电路,测试了发射、接收链路,并结合声表面波标签进行了实验,通过与矢量网络分析仪测量结果对比,表明了该阅读器的有效性。 The existing readers matching SAW(Surface Acoustic Wave,SAW)tags usually use a non-coherent superheterodyne structure,and generate the excitation pulse signal by a switch.Because of the randomness of the switch closing time and the initial phase of the local oscillator signal,the echo phase measured in this scheme is an uncertain value,which cannot establish a functional relationship with the measurement like distance.In this paper,we design a kind of phasecoherent reader,which divides the signal generated by the signal source into two signals in the same phase with the power divider in the transmitting link,and introduces one of them into the lower mixer of the receiving link as the local oscillator signal,so that the echo phase can be a definite value.The actual reader circuit is made,the transmitting and receiving links are tested,and the experiment is carried out with the SAW tag.The comparison with the measurement results of the vector network analyzer shows the effectiveness of the reader.
作者 韩宇 陈智军 曾庆化 庞旗旗 王春涛 朱卫俊 HAN Yu;CHEN Zhijun;ZENG Qinghua;PANG Qiqi;WANG Chuntao;ZHU Weijun(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;CETC Deqing Huaying Electronics Co.,Deqing 313200,China)
出处 《测试技术学报》 2023年第6期474-480,489,共8页 Journal of Test and Measurement Technology
基金 江苏省重点研发计划社会发展项目(BE2022844) 江苏省研究生实践创新计划(SJCX21_0101)。
关键词 声表面波 相参阅读器 零中频 相位测量 surface acoustic wave phase-coherent reader zero intermediate frequency phase measurement
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