In this paper, we shall develop the linear causal analysis for the system consisting of two flows in a real inner product space and give an algorithm for calculating the non-linear filter for a discrete stochastic system which is given by two discrete time stochastic processes, to be called a signal process and an observation process, based upon the theory of $\mathrm{KM}_2\mathrm{O}$ -Langevin equations.
@article{1150287304,
author = {OKABE, Yasunori and MATSUURA, Masaya},
title = {On non-linear filtering problems for discrete time stochastic processes},
journal = {J. Math. Soc. Japan},
volume = {57},
number = {4},
year = {2005},
pages = { 1067-1076},
language = {en},
url = {http://dml.mathdoc.fr/item/1150287304}
}
OKABE, Yasunori; MATSUURA, Masaya. On non-linear filtering problems for discrete time stochastic processes. J. Math. Soc. Japan, Tome 57 (2005) no. 4, pp. 1067-1076. http://gdmltest.u-ga.fr/item/1150287304/