Absolutely, "active cancellation"...or when the active radar signals are scrambled and deflected and similar 'artificial' frequency is sent back, the return on the radar isn't precise anymore as it mathematical calculation processor is off.
Anything fired on the object being locked or tracked will probably miss it by good few meters at the least. Something that the EFT used in an exercise was the FLIR and that seems to work better as there were no broad spectrum radio waves to scramble, it's just the IR running in sort of in a snapshot mode.