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RCS = 4 X PI X R^2 (Mod(Es) ^2 / Mod(Ei)^2), where Es is the scattered E - field and Ei is the incident E - field. R is the distance from source to the scatterer.
In FDTD if you want to implement this you need to implement a near field to far field transformer (Refer Taflove, Chapter 8, 3rd Edition). (I haven't tried this implementation yet).
There are other formulae as well for RCS computation.
Best Regards
Jithesh
Added after 5 minutes:
Have a look at the link
Topic : "FDTD far field implementation"
for a Python code for NF to FF implementation in FDTD.
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