Processing your simulated data should most likely be done using a similar workflow as you would for real/measured GPR data. There are lots of the different software and tools available to do that. Our current preferred option is Geolitix (
https://www.geolitix.com/) which is cloud-based, intuitive, and can create some powerful visualisations. Geolitix has all the standard processing filters you'd expect, e.g. time zero correction, gain profiles, frequency filters, background removal etc.... It can also load B-scans from gprMax.
Craig