Velocity despiking: Difference between revisions
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[[File:Velocities spike.png|thumb|Example velocities measured by an [[Acoustic-Doppler Velocimeters| acoustic-Doppler velocimeters]].]] | [[File:Velocities spike.png|thumb|Example velocities measured by an [[Acoustic-Doppler Velocimeters| acoustic-Doppler velocimeters]].]] | ||
The most used with [[Acoustic-Doppler Velocimeters| acoustic-Doppler velocimeters]] are the phase-space thresholding techniques <ref name="GoringNikora" | The most used with [[Acoustic-Doppler Velocimeters| acoustic-Doppler velocimeters]] are the phase-space thresholding techniques <ref name="GoringNikora"/>. Other techniques currently being investigated by the subgroup are those used in atmospheric turbulence studies <ref name="Starkenburg">{{Cite journal|authors= D. Starkenburg, S. Metzger, G.J. Fochesatto, J.G Alfieri, R. Gens, A. Prakash and J. Cristobal|journal_or_publisher= J. Atmos. Oceanic Technoly|paper_or_booktitle= Assessment of Despiking Methods for Turbulence Data in Micrometeorology | ||
Other techniques currently being investigated by the subgroup are those used in atmospheric turbulence studies | |||
<ref name="Starkenburg">{{Cite journal|authors= D. Starkenburg, S. Metzger, G.J. Fochesatto, J.G Alfieri, R. Gens, A. Prakash and J. Cristobal|journal_or_publisher= J. Atmos. Oceanic Technoly|paper_or_booktitle= Assessment of Despiking Methods for Turbulence Data in Micrometeorology | |||
|year= 2016|doi= 10.1175/JTECH-D-15-0154.1}}</ref>, in particular median filter despiking technique <ref name="Brock">{{Cite journal|authors=F.V. Brock|journal_or_publisher= J. Atmos. Oceanic Technoly|paper_or_booktitle= A nonlinear filter to remove impulse noise from meteorological data | |year= 2016|doi= 10.1175/JTECH-D-15-0154.1}}</ref>, in particular median filter despiking technique <ref name="Brock">{{Cite journal|authors=F.V. Brock|journal_or_publisher= J. Atmos. Oceanic Technoly|paper_or_booktitle= A nonlinear filter to remove impulse noise from meteorological data | ||
|year= 1986|doi= 10.1175/1520-0426(1986)003,0051:ANFTRI.2.0.CO;2}}</ref>. | |year= 1986|doi= 10.1175/1520-0426(1986)003,0051:ANFTRI.2.0.CO;2}}</ref>. | ||
==Notes== | ==Notes== | ||
Revision as of 18:38, 24 November 2021
Overview
Any measured signal may be contaminated by spikes. These spikes are typically short-lived and transient, which result in sudden change in the measured signal.
Spikes in velocities measured by acoustic-Doppler velocimeters can result from aliasing of the Doppler signal, in particular when pulses become contaminated by reflecting from complex objects and boundaries [1]. Several techniques exist for de-spiking.
The most used with acoustic-Doppler velocimeters are the phase-space thresholding techniques [1]. Other techniques currently being investigated by the subgroup are those used in atmospheric turbulence studies [2], in particular median filter despiking technique [3].
Notes
- ↑ 1.0 1.1 D. G. Goring and V.I. Nikora. 2002. Despiking Acoustic Doppler Velocimeter Data. Journal of Hydraulic Engineering. doi:10.1061/ASCE0733-94292002128:1117
- ↑ D. Starkenburg, S. Metzger, G.J. Fochesatto, J.G Alfieri, R. Gens and A. Prakash and J. Cristobal. 2016. Assessment of Despiking Methods for Turbulence Data in Micrometeorology. J. Atmos. Oceanic Technoly. doi:10.1175/JTECH-D-15-0154.1
- ↑ F.V. Brock. 1986. A nonlinear filter to remove impulse noise from meteorological data. J. Atmos. Oceanic Technoly. doi:10.1175/1520-0426(1986)003,0051:ANFTRI.2.0.CO;2
