The Regional Boundary Reconstruction Problem of the Initial State for Fractional Semilinear Systems
Observability is a fundamental concept in control theory. Its primary purpose is to look into whether it is possible to reconstruct the system's initial state using only the information from its outputs. This paper focuses on the regional reconstruction problem of the initial state for a semilinear time-fractional system, which refers to the possibility of recovering the value of the initial state on a desired boundary sub-region instead of the whole evolution domain or its boundary. To achieve this objective, we use the analytical method, where we suppose that the system's dynamic generates an analytic semigroup. First, by establishing an internal sub-region, we establish a connection between the concepts of regional observability and regional boundary observability; we will later explain how to define the internal sub-region. Then, by imposing suitable assumptions on the analytic semigroup and the system's non-linearity, we give the main theorems of this research from which we deduce a sequence that converges to the unknown initial state on the desired boundary sub-region. Moreover, we present an algorithm that produces some numerical simulations which align closely with our theoretical findings.