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中文摘要：
远距离的声表面波传感系统具有广泛的应用前景。为增加查询距离,需提高接收通道回波信噪比。针对接收通道干扰信号与传感响应信号频率一致且难以消除等问题,提出了一种能够在接收期间通过调节发射信号频率改变干扰信号与响应信号频率差,以频率不同抑制干扰信号,进而提高信噪比的方法。设计并测试了实验系统。实验结果表明,该方法能有效提高回波信号信噪比10.68 dB,实测查询距离大于16 m。该方法为远程无源无线传感测量提供了保证,具有实际应用价值。
英文摘要：
Long-range （surface acoustic wave, SAW） sensing system has broad application prospects. In order to im- prove the interrogation distance, it is necessary to improve the （ signal to noise ratio, SNR） of the received signal of the receiving channel. Aiming at the problem that the interference signal of the receiving channel has the same fre- quency as that of the receiving response signal, which is hard to be eliminated, a method of suppressing the interfer- ence signal and improving the SNR is proposed, which adjusts the excitation signal frequency during the receiving pe- riod, so the frequency difference between interference signal and response signal changes and the interference signal is filtered. The SNR of the received signal is significantly improved. An experiment system was designed, fabricated and tested. Experimental results show that this method can improve the SNR by 10.68 dB compared with traditional method and the maximum interrogation distance is more than 16 m. This method ensures long-range passive wireless sensing measurement and has practical application value.
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