Not sure, but I wouldn't be surprised. I don't understand much of how radar works, but my understanding at a really basic level is that you're sending out some

Not sure, but I wouldn't be surprised. I don't understand much of how radar works, but my understanding at a really basic level is that you're sending out some known modulated signal and then extracting some information from the magnitude and delay of that returned signal. In that case, this is the same idea, but in the adaptive filtering case, it's actually the errors in the received modulated signal that you care about, because the error contains all the signals you didn't originally transmit - things like room sounds, or audio multipath. I will admit, however, that I don't know enough about radar to know that we're not talking past one another. XD