  In this work, we investigate the localization of targets in the presence of
multiple scattering. We focus on the often omitted scenario in which
measurement data is affected by multiple scattering, and a simpler model is
employed in the estimation. We study the impact of such model mismatch by means
of the Misspecified Cram\'er-Rao Bound (MCRB). In numerical simulations
inspired by tomographic inspection in ultrasound nondestructive testing, the
MCRB is shown to correctly describe the estimation variance of localization
parameters under misspecification of the wave propagation model. We provide
extensive discussion on the utility of the MCRB in the practical task of
verifying whether a chosen misspecified model is suitable for localization
based on the properties of the maximum likelihood estimator and the nuanced
distinction between bias and parameter space differences. Finally, we highlight
that careful interpretation is needed whenever employing the classical CRB in
the presence of mismatch through numerical examples based on the Born
approximation and other simplified propagation models stemming from it.
