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 game of thrones jon snow poster signal-to-noise ratio represents an enhanced readout distance.This work considers this architecture as an interrogation unit for SAW tags with time and phase encoding.The parameters of the proposed digital filter, which is a mako shark toys 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 at the time position of the reflectors, which is critical for correct identification of the code in phase encoding schemes.