Search Results - "Chapnik, B."

Diagnosis of observation, background and analysis‐error statistics in observation space by Desroziers, G., Berre, L., Chapnik, B., Poli, P.

“…Most operational assimilation schemes rely on linear estimation theory. Under this assumption, it is shown how simple consistency diagnostics can be obtained…”
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Forecast impact studies of zenith total delay data from European near real-time GPS stations in Météo France 4DVAR by Poli, P., Moll, P., Rabier, F., Desroziers, G., Chapnik, B., Berre, L., Healy, S. B., Andersson, E., El Guelai, F.-Z.

“…Several networks of Global Positioning System receiving stations over Europe send their data to several processing centers to generate atmospheric Zenith Total…”
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On the extraction of wind information from the assimilation of ozone profiles in Météo–France 4-D-Var operational NWP suite by Semane, N., Peuch, V.-H., Pradier, S., Desroziers, G., El Amraoui, L., Brousseau, P., Massart, S., Chapnik, B., Peuch, A.

“…By applying four-dimensional variational data-assimilation (4-D-Var) to a combined ozone and dynamics Numerical Weather Prediction model (NWP), ozone…”
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Diagnosis and tuning of observational error in a quasi‐operational data assimilation setting by Chapnik, Bernard, Desroziers, Gerald, Rabier, Florence, Talagrand, Olivier

“…Desroziers and Ivanov proposed a method to tune error variances used for data assimilation. The implementation of this algorithm implies the computation of the…”
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Properties and first application of an error‐statistics tuning method in variational assimilation by Chapnik, Bernard, Desroziers, Gerald, Rabier, Florence, Talagrand, Olivier

“…The method for tuning observational or background error statistics is presented and some of its properties are exposed using theoretical considerations and…”
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Use of randomization to diagnose the impact of observations on analyses and forecasts by Desroziers, G'erald, Brousseau, Pierre, Chapnik, Bernard

“…A method is proposed to diagnose the impact of a complete set, or subsets, of observations on the reduction of error variance in an analysis and in the…”
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Modeling impact on a one-link flexible robotic arm by Chapnik, B.V., Heppler, G.R., Aplevich, J.D.

“…A finite-element model for a single-link flexible robotic arm including the effects of beam damping, hub inertia and both Coulomb and viscous hub friction is…”
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Impact study of the 2003 North Atlantic THORPEX Regional Campaign by Fourrié, Nadia, Marchal, David, Rabier, Florence, Chapnik, Bernard, Desroziers, Gerald

“…An experiment took place during autumn 2003 with the aim of testing the feasibility of an operational targeting of observations over the North Atlantic Ocean…”
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Controlling the impact response of a one-link flexible robotic arm by Chapnik, B.V., Heppler, G.R., Aplevich, J.D.

“…An open-loop control system is designed using frequency-domain techniques to compute a desired hub torque profile. The motion of the arm after tip impact,…”
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Evaluation, office improvements can reduce VDT operator problems by Chapnik, E B, Gross, C M

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