Feature Extraction of PDV Challenge Data Set A with Digital Down Shift (DDS)
Thomas W. Tunnell · University of North Texas Digital Library (University of North Texas) · 2012
This slide-show is about data analysis in photonic Doppler velocimetry. The digital down shift subtracts a specified velocity (frequency) from all components in the Fourier frequency domain and generates both the down shifted in-phase and out-of-phase waveforms so that phase and displacement can be extracted through a continuous unfold of the arctangent.