Adaptive Filtering for FSCW Signal-to-noise Ratio Enhancement of SAW Interrogation Units

Adaptive Filtering for FSCW Signal-to-noise Ratio Enhancement of SAW Interrogation Units

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A digital filter that improves the signal-to-noise ratio of the response of a FSCW (Frequency Stepped Continuous Wave) scheme is presented.An improvement in signal-to-noise ratio represents an enhanced readout distance.This work considers this architecture as an interrogation unit for vital nutrients vitex 750 SAW tags with time and phase encoding.The parameters of the proposed digital filter, which is a non-linear edge preserving filter, were studied and tested for this specific application.An improvement of around 20dB in the SNR level was achieved.

This filter preserves the phase of the signal demonhorns edge at the time position of the reflectors, which is critical for correct identification of the code in phase encoding schemes.