This work presents a model of phase perturbations affecting bistatic SAR L-band acquisitions, along with a multisquint-based compensation method. It is shown how this method is able to discriminate each component of the phase screens, thus allowing a more accurate correction scheme. The phase compensation accuracy is assessed on the recovery of each individual screen and on tomography by generating time-domain simulations of bistatic SAR images. Perturbations are introduced starting from the RAW data, subsequently recovering each screen from the multisquint processed sub-bands and performing the corrections. The recently proposed SAOCOM-CS tomographic configuration (quasi-monostatic geometry) is taken as reference for the simulations.