radar signature is the detailed waveform of a detected radar echo . whenever we get an enemy radar signature it's goes into database's. Using these databases we can quickly identify the type of aircraft , it's a continuous process that's why every country is using dedicated Elint , sigint and COMINT systems to track and record all kind of enemy emissions . It's not about the radar but the signal processing systems which analys the signal and comparing it with the database . In radar screen it's just a blip .