Linear Smoothing of Noisy Spatial Temporal Series
Valter d. Giacinto, Ian dryden, Luigi ippoliti and Luca ramognali
DOI : 10.3844/jmssp.2005.309.321
Journal of Mathematics and Statistics
Volume 1, Issue 4
The main objective of the study is the development of a linear filter to extract the signal from a spatio-temporal series affected by measurement error. We assume that the evolution of the unobservable signal can be modelled by a space time autoregressive process. In its vectorial form, the model admits a state space representation allowing the direct application of the Kalman filter machinery to predict the unobservable state vector on the basis of the sample information. Having introduced the model, referred to as a STARG+Noise model, the study discusses Maximum Likelihood (ML) parameter estimation assuming knowledge of the variance of the noise process. Consistent method of moments estimators of the autoregressive coefficients and noise variance are also derived, primarily to be used as inputs in the ML estimation procedure. Finally, we consider some simulation studies and an investigation involving sulphur dioxide level monitoring.
© 2005 Valter d. Giacinto, Ian dryden, Luigi ippoliti and Luca ramognali. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.