Wireless Sensing with Software Defined Radio

In this paper, we investigate the application of using software defined radio (SDR) and surface acoustic wave (SAW) devices for wireless measurement of the response of in-situ sensors. In the proposed system, SDR collects magnitude and phase of the reflected waves from a SAW device connected to a sensor. The spectral-domain data is then converted to time-domain to extract the sensor responses. By comparing the results obtained from SDR with those obtained from a commercial vector network analyzer (VNA), we show the accuracy of the proposed technique.