  With a continuous-time formulation of the multihop decomposition, we propose
a distributed hybrid observer for a sensor network where the plant and local
observers run in continuous time and the information exchange among the sensing
nodes is sampled-data. Process disturbances, measurement noise and
communication noise are considered, and we prove that under some necessary
detectability assumptions the observer gains can be tuned to guarantee
exponential ISS with a prescribeda convergence rate. Simulations illustrate the
performance of the proposed observer.
