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A novel identification method of multiple OFC SAW sensor tags

机译:一种新型OFC SAW传感器标签识别方法

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In order to identify more surface acoustic wave (SAW) sensor tags simultaneously, the characteristics of superposed signals reflected from multiple orthogonal frequency coded (OFC) SAW tags are analyzed. Although these signals arriving at a reader are asynchronous, the different central frequency signals still keep orthogonal in an appropriate time window range as long as all tags are within a certain distance. The amplitudes and phases of the superposed signals with same central frequency from the identical reflector positions of different sensor tags can be measured. The matrix relational expression between the measurable values and the amplitudes, delay of signals from each tag is found out. Then, tags identification is converted into solving this equation. The relation between the maximum number of simultaneous identifiable tags and the number of optional central frequencies of reflectors is obtained with the assumption that all reflected signals arrive at a reader synchronically. The simultaneous identifiable OFC SAW tags set is selected with the above assumption. It is explained that the selected tags set can also be identified simultaneously on condition that reflected signals arrive at a reader asynchronously. The above theoretical analysis is verified by iterative method in MATLAB software.
机译:为了同时识别更多的表面声波(SAW)传感器标签,分析了从多个正交频率编码(OFC)SAW标签反射的叠加信号的特性。尽管这些到达读取器的信号是异步的,但是只要所有标签都在一定距离之内,不同的中心频率信号仍会在适当的时间窗口范围内保持正交。可以测量来自不同传感器标签的相同反射器位置的具有相同中心频率的叠加信号的幅度和相位。找出可测量值与幅度之间的矩阵关系表达式,以及来自每个标签的信号延迟。然后,将标签识别转换为求解该方程式。假设所有反射信号均同步到达阅读器,则可获得同时可识别标签的最大数量与反射器的可选中心频率之间的关系。根据上述假设选择同时可识别的OFC SAW标签集。解释了在反射信号异步到达读取器的情况下,也可以同时识别所选标签集。以上理论分析在MATLAB软件中通过迭代法得到了验证。

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