Interrogation of orthogonal frequency coded SAW sensors using the USRP

时间频率公报 Pub Date : 2015-04-12 DOI:10.1109/FCS.2015.7138900

J. Humphries, M. Gallagher, D. Gallagher, A. Weeks, D. Malocha

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引用次数: 7

Abstract

The universal software radio peripheral (USRP) is a versatile software defined radio (SDR) platform, developed by Ettus Research™, which is intended for a wide variety of applications ranging from communication links to RADAR. We have investigated another application of the USRP by implementing a transceiver capable of interrogating passive, wireless surface acoustic wave (SAW) sensors centered at 915MHz. Interrogation of wideband orthogonal frequency coded (OFC) SAW sensors imposes strict requirements on the timing and synchronization of the transceiver. In the standard mode of operation, samples are generated and streamed between the USRP and host computer, introducing latency and bandwidth limitations due to the sampling bus. To achieve the performance required for this application, the USRP FPGA has been modified to introduce new functionality. Extraction of the sensor temperature is accomplished with a custom matched filter correlator. The system is capable of interrogating multiple sensors and can quickly reconfigure the USRP. Demonstration of the USRP wireless sensor system is achieved by interrogating wireless SAW OFC sensors at 915MHz and extracting the sensor temperature.

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基于USRP的正交频率编码SAW传感器的研究

通用软件无线电外设(USRP)是一种通用的软件定义无线电(SDR)平台，由Ettus Research™开发，用于从通信链路到雷达的各种应用。我们研究了USRP的另一个应用，通过实现一个收发器，该收发器能够询问以915MHz为中心的无源无线表面声波(SAW)传感器。宽带正交频编码(OFC)声表面波传感器的研制对收发器的定时和同步提出了严格的要求。在标准操作模式中，采样被生成并在USRP和主机之间传输，由于采样总线而引入延迟和带宽限制。为了达到此应用程序所需的性能，USRP FPGA已经进行了修改，以引入新的功能。传感器温度的提取是由自定义匹配的滤波器相关器完成的。该系统能够询问多个传感器，并可以快速重新配置USRP。USRP无线传感器系统的演示是通过询问915MHz的无线SAW OFC传感器并提取传感器温度来实现的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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时间频率公报

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