That's not really radar though. Radar systems have a dedicated transmitter that broadcasts. Phased array radars have transmitters as well. What you're describin

That's not really radar though. Radar systems have a dedicated transmitter that broadcasts. Phased array radars have transmitters as well. What you're describing is more akin to ESM. Conflating the two definitions diminishes both. It's like when submarine movies depict sonar using a hydrophone without a transmitter; that's passive compared to real sonar that creates a ping. Passive and active are both valuable in their own regimes, but they're not the same.