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基于声表面波回波信号解调方法研究
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Abstract:
随着声表面波射频识别技术(SAW-RFID)的发展，实现远距离、高分辨率的SAW标签探测成了整个系统的关键因素。但是由于SAW的特殊性以及环境的影响，带有标签信息的回波信号会淹没在噪声之中，对信息的提取难度极大。本文针对此问题，提出了雷达系统中常用的正交解调和相干累加，两者进行结合的方法。先在MATLAB中进行仿真，后搭建实际硬件电路，对真实的回波信号进行处理，实现了在相位误差在3？范围内进行相干累加，同时提高了约20 dB的信噪比，为SAW-RFID技术提供了更多的可能。
With the development of SAW-RFID, the realization of long-range and high-resolution SAW tag detection has become a key factor in the whole system. However, due to the particularity of SAW and the influence of the environment, the echo signal with the label information will be drowned in the noise, and it is extremely difficult to extract the information. In order to solve this problem, this paper proposes a method that combines orthogonal demodulation and coherent accumulation, which are commonly used in radar systems. The simulation was carried out in MATLAB, and then the actual hardware circuit was built to process the real echo signal, which realized the coherent accumulation of the phase error in the range of 3？, and improved the signal-to-noise ratio of about 20 dB, which provided more possibilities for SAW-RFID technology.
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