I don't know how this particular radar system works, but in general you can modulate radar signals with a special encoding, so that only the sender can receive and interpret it. For all others the signal is juse noise. At university we worked with m-sequence based radar systems that have these properties. This would minimize the possibility that someone (accidently or not) can send signals that you misinterpret. Depending on the remaining possibility you might still want to take same countermeasures.