State estimation for linearized MHD flow. - Jaganath Chandrasekar; Oscar Barrero; Aaron J. Ridley; Dennis S. Bernstein; Bart De Moor (CDC, 2004)

Electric potential estimation with line-of-sight measurements using basis function optimization. - Harish J. Palanthandalam-Madapusi; Steven Gillijns; Aaron J. Ridley; Dennis S. Bernstein; Bart De Moor (CDC, 2004)

Solution-adaptive magnetohydrodynamics for space plasmas: Sun-to-Earth simulations. - Tamas I. Gombosi; Kenneth G. Powell; Darren De Zeeuw; C. Robert Clauer; Kenneth C. Hansen; Ward B. Manchester; Aaron J. Ridley; Ilia I. Roussev; Igor V. Sokolov; Quentin F. Stout; Gábor Tóth (Comput. Sci. Eng., 2004)

Partial-state estimation using an adaptive disturbance rejection algorithm. - Dennis S. Bernstein; Jaganath Chandrasekar; Aaron J. Ridley (ACC, 2005)

A SDRE-based asymptotic observer for nonlinear discrete-time systems. - Jaganath Chandrasekar; Aaron J. Ridley; Dennis S. Bernstein (ACC, 2005)

Identification and prediction of ionospheric dynamics using a Hammerstein-Wiener model with radial basis functions. - Harish J. Palanthandalam-Madapusi; Aaron J. Ridley; Dennis S. Bernstein (ACC, 2005)

A High-Performance Framework for Sun-to-Earth Space Weather Modeling. - Ovsei Volberg; Tamas I. Gombosi; Kenneth G. Powell; Aaron J. Ridley; Kenneth C. Hansen; Gábor Tóth; Quentin F. Stout; Darren De Zeeuw; Kevin Kane; David R. Chesney; Robert H. Oehmke (IPDPS, 2005)

What is the ensemble Kalman filter and how well does it work? - Steven Gillijns; Oscar Barrero; Jaganath Chandrasekar; B. L. R. De Moor; Dennis S. Bernstein; Aaron J. Ridley (ACC, 2006)

Data Assimilation Using the Global Ionosphere-Thermosphere Model. - I. S. Kim; Jaganath Chandrasekar; Aaron J. Ridley; Dennis S. Bernstein (International Conference on Computational Science (3), 2006)

Reduced-Order Covariance-Based Unscented Kalman Filtering with Complementary Steady-State Correlation. - Jaganath Chandrasekar; I. S. Kim; Aaron J. Ridley; Dennis S. Bernstein (ACC, 2007)

A Comparison of the Extended and Unscented Kalman Filters for Discrete-Time Systems with Nondifferentiable Dynamics. - Jaganath Chandrasekar; Aaron J. Ridley; Dennis S. Bernstein (ACC, 2007)

State Estimation for Large-Scale Systems Based on Reduced-Order Error-Covariance Propagation. - I. S. Kim; Jaganath Chandrasekar; Harish J. Palanthandalam-Madapusi; Aaron J. Ridley; Dennis S. Bernstein (ACC, 2007)

NARMAX identification for space weather prediction using polynomial radial basis functions. - Harish J. Palanthandalam-Madapusi; Biju Edamana; Dennis S. Bernstein; Ward B. Manchester; Aaron J. Ridley (CDC, 2007)

Cholesky-based reduced-rank square-root Kalman filtering. - Jaganath Chandrasekar; I. S. Kim; Dennis S. Bernstein; Aaron J. Ridley (ACC, 2008)

Localized data assimilation in the ionosphere-thermosphere using a sampled-data unscented Kalman filter. - I. S. Kim; D. J. Pawlowski; Aaron J. Ridley; Dennis S. Bernstein (ACC, 2008)

Magnetic-field estimation using measurements from a floating buoy. - Harish J. Palanthandalam-Madapusi; Dennis S. Bernstein; Aaron J. Ridley (ACC, 2008)

Data assimilation for magnetohydrodynamics with a zero-divergence constraint on the magnetic field. - Bruno Otávio Soares Teixeira; Aaron J. Ridley; Leonardo A. B. Torres; Luis Antonio Aguirre; Dennis S. Bernstein (ACC, 2008)

Recursive estimation of terrestrial magnetic and electric potentials. - Anthony M. D'Amato; Bruno Otávio Soares Teixeira; Harish J. Palanthandalam-Madapusi; Aaron J. Ridley; Dennis S. Bernstein (CDC, 2008)

Reduced-rank unscented Kalman filtering using Cholesky-based decomposition. - Jaganath Chandrasekar; I. S. Kim; Dennis S. Bernstein; Aaron J. Ridley (Int. J. Control, 2008)

A nonlinear observer for semidetectable chemical reactions with application to kinetic-rate-constant estimation. - Anthony M. D'Amato; Aaron J. Ridley; Dennis S. Bernstein (CDC, 2009)

Adaptive Model Refinement for the Ionosphere and Thermosphere. - Anthony M. D'Amato; Aaron J. Ridley; Dennis S. Bernstein (CIDU, 2010)

Retrospective-cost-based model refinement for system emulation and subsystem identification. - Alexey V. Morozov; Asad A. Ali; Anthony M. D'Amato; Aaron J. Ridley; Sunil L. Kukreja; Dennis S. Bernstein (CDC/ECC, 2011)

Retrospective-cost-based adaptive model refinement for the ionosphere and thermosphere. - Anthony M. D'Amato; Aaron J. Ridley; Dennis S. Bernstein (Stat. Anal. Data Min., 2011)

The CYGNSS nanosatellite constellation hurricane mission. - Christopher S. Ruf; Scott Gleason 001; Zorana Jelenak; Stephen J. Katzberg; Aaron J. Ridley; Randall Rose; John Scherrer; Valery U. Zavorotny (IGARSS, 2012)

Retrospective Cost Optimization for Adaptive State Estimation, Input Estimation, and Model Refinement. - Anthony M. D'Amato; Asad A. Ali; Aaron J. Ridley; Dennis S. Bernstein (ICCS, 2013)

Specification of the Ionosphere-Thermosphere Using the Ensemble Kalman Filter. - Humberto C. Godinez; Earl Lawrence; David Higdon; Aaron J. Ridley; Josef Koller; Alexei V. Klimenko (DyDESS, 2014)

Retrospective-Cost-Based Adaptive Input and State Estimation for the Ionosphere-Thermosphere. - Asad A. Ali; Ankit Goel; Aaron J. Ridley; Dennis S. Bernstein (J. Aerosp. Inf. Syst., 2015)

Relative Ionospheric Ranging Delay in LEO GNSS Oceanic Reflections. - Jordi Xing; Seebany Datta-Barua; James L. Garrison; Aaron J. Ridley; Boris Pervan (IEEE Geosci. Remote. Sens. Lett., 2015)

The nasa cygnss mission: Overview and status update. - Christopher Ruf; Scott Gleason 001; Aaron J. Ridley; Randall Rose; John Scherrer (IGARSS, 2017)

Estimation of the Eddy Diffusion Coefficient Using Total Electron Content Data. - Ankit Goel; Aaron J. Ridley; Dennis S. Bernstein (ACC, 2018)

Enabling Sampling Properties of the Cygnss Satellite Constellation. - Christopher Ruf; Charles Bussy-Virat; Darren McKague; Aaron J. Ridley; Mary Morris (IGARSS, 2018)

Intelligent systems for geosciences: an essential research agenda. - Yolanda Gil; Suzanne A. Pierce; Hassan A. Babaie; Arindam Banerjee 001; Kirk D. Borne; Gary S. Bust; Michelle Cheatham; Imme Ebert-Uphoff; Carla P. Gomes; Mary C. Hill; John D. Horel; Leslie Hsu; et al. (Commun. ACM, 2019)

Assessment of the Differential Drag Maneuver Operations on the CYGNSS Constellation. - Charles Bussy-Virat; Aaron J. Ridley; Abhay Masher; Kyle Nave; Marissa Intelisano (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2019)

Relationship Between Temporal and Spatial Resolution for a Constellation of GNSS-R Satellites. - Charles Bussy-Virat; Christopher S. Ruf; Aaron J. Ridley (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2019)

Estimation of Thermal-Conductivity Coefficients in the Global Ionosphere-Thermosphere Model. - Ankit Goel; Brandon Ponder; Aaron J. Ridley; Dennis S. Bernstein (J. Aerosp. Inf. Syst., 2020)