Data Assimilation for Chemical Reaction Networks and Population Models via a Tunable Observer

Animikh Biswas; Gargi Chaudhuri; Muruhan Rathinam

Data Assimilation for Chemical Reaction Networks and Population Models via a Tunable Observer

Dynamical Systems 2026-07-28 v1

Authors: Animikh Biswas , Gargi Chaudhuri , Muruhan Rathinam

Abstract

We consider the problem of state reconstruction for a nonlinear dynamical system from observations of a linear function of the state. We present a design method for a tunable observer and provide a general theorem which under certain conditions guarantees exponential convergence of the observer regardless of initial error. Additional results are provided that apply this theorem to chemical reaction network models. Moreover, these results are illustrated via examples of mass action form of chemical reaction networks where a subset of the species concentrations are observed. Numerical results are provided to show the efficacy of our proposed observer. Numerical results are also shown for the case of noisy observations and our observer is compared favorably with the particle filter when the observation noise is small.

Keywords

data assimilation tunable observer chemical reaction networks state reconstruction exponential convergence particle filter

Cite

@article{arxiv.2607.25879,
  title  = {Data Assimilation for Chemical Reaction Networks and Population Models via a Tunable Observer},
  author = {Animikh Biswas and Gargi Chaudhuri and Muruhan Rathinam},
  journal= {arXiv preprint arXiv:2607.25879},
  year   = {2026}
}