| 无线声表面波辨识标签最佳判决电平的确定 |
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| 引用本文： | 赵家亮,韩韬,施文康.无线声表面波辨识标签最佳判决电平的确定[J].上海交通大学学报,2004,38(2):175-177. |
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| 作者姓名： | 赵家亮 韩韬 施文康 |
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| 作者单位： | 上海交通大学,电子信息与电气工程学院,上海,200030 |
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| 基金项目： | 上海市自然科学基金(01ZF14040)，国家自然科学基金(10304012)资助项目 |
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| 摘 要： | 由于受到多次反射和传播损耗的影响，延迟线型声表面波辨识标签的每一位编码幅度的判决电平需要合理确定。推导了开关键控编码方式的辨识标签分别在编码为“0”和“1”时的误判率与接收信号信噪比、编码“0”和“1”的动态范围以及判决门限值的关系，得出了在大信噪比情况下，最佳判决电平与信噪比和编码动态范围之间的解析表达式，通过对不同接收距离下回波信号的实验验证，证明该最佳判别电平是有效的。
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| 关 键 词： | 声表面波 辨识标签 判决电平 |
| 文章编号： | 1006-2467(2004)02-0175-03 |
| 修稿时间： | 2003年3月11日 |
Determination of Optimal Threshold Level for Surface Acoustic Wave ID-Tags |
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| ZHAO Jia-liang,HAN Tao,SHI Wen-kang.Determination of Optimal Threshold Level for Surface Acoustic Wave ID-Tags[J].Journal of Shanghai Jiaotong University,2004,38(2):175-177. |
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| Authors: | ZHAO Jia-liang HAN Tao SHI Wen-kang |
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| Abstract: | It is necessary to find an optimal threshold level of delay-line type surface acoustic wave(SAW) based identification-tag(ID-Tag), because each bit code suffers from the influence of multiple reflection and propagation losses and is not uniform in amplitude. The judgement probability of error of code"1"and code "0" in on-off coding tags in addition to the analytical relationship between the optimal threshold level and the signal-noise ratio, the dynamic separation were deduced. The theoretical threshold level is verified to be feasible in experiment, which is used in reading the reflected signal of ID-Tag with 8 (reflectors)when the reading distances are 1 m and 1.5 m, respectively. |
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| Keywords: | surface acoustic wave(SAW) identification tag(ID-Tag) threshold level |
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