Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-08-13
Physics
Condensed Matter
Other Condensed Matter
Interdisciplinary, 41 pages, 5 figures, JHEP3 class; added more discussion and references
Scientific paper
In this paper, the Feynman path integral formulation of the continuous-continuous filtering problem, a fundamental problem of applied science, is investigated for the case when the noise in the signal and measurement model is additive. It is shown that it leads to an independent and self-contained analysis and solution of the problem. A consequence of this analysis is Feynman path integral formula for the conditional probability density that manifests the underlying physics of the problem. A corollary of the path integral formula is the Yau algorithm that has been shown to be superior to all other known algorithms. The Feynman path integral formulation is shown to lead to practical and implementable algorithms. In particular, the solution of the Yau PDE is reduced to one of function computation and integration.
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