A noise-robust method for passive wireless resonant SAW sensor

Abstract

Purpose This paper aims to propose a noise-robust method to estimate the frequency of the reflective echo to reduce the negative effects of noise and improve the accuracy and resolution of a resonant surface acoustic wave (SAW) sensor. Design/methodology/approach The proposed approach exploits the singular value decomposition to obtain the frequency information of a SAW response signal and overcome the noise influences. Findings Compared with the commonly used Fourier transform (FT) method, the accuracy and resolution improvement of the proposed method used in the SAW sensor is validated. Originality/value The system using the proposed method delivers lesser standard deviation, that is, delivers higher performance than the conventional system using the fast FT method.