Multilevel ensemble Kalman filtering for spatio-temporal processes

Multilevel ensemble Kalman filtering for spatio-temporal processes

Hoel, Hakon, Alexey Chernov, Kody Law, Fabio Nobile, and Raul Tempone. "Multilevel ensemble Kalman filtering for spatio-temporal processes." (2018)
Hoel, Hakon, Alexey Chernov, Kody Law, Fabio Nobile, and Raul Tempone
Monte Carlo, multilevel, filtering, Kalman filter, ensemble Kalman filter, partial differential equations (PDE)
2017
This work concerns state-space models, in which the state-space is an infinite-dimensional spatial field, and the evolution is in continuous time, hence requiring approximation in space and time. The multilevel Monte Carlo (MLMC) sampling strategy is leveraged in the Monte Carlo step of the en- semble Kalman filter (EnKF), thereby yielding a multilevel ensemble Kalman filter (MLEnKF) for spatio-temporal models, which has provably superior asymptotic error/cost ratio. A practically relevant stochastic partial differential equation (SPDE) example is presented, and numerical experiments with this example support our theoretical findings.​