That's not radar. It's similar to the military Friend or Foe system that works on radio transmissions. It says I'm here heading there, this is a US military aircraft, who are you. If the other aircraft doesn't respond with the proper code then the pilot takes the required action, basically kill, evade etc. For civilian aircraft I believe they leave out the kill option. Seriously though it would basically inform the drone if it were in its flight path & to clear the way.
Since it's not radar that system alone would allow you to fly into a wall. Radar doesn't distinguish between friend or foe, but picks up birds, aircraft or pretty much any that will reflect a radar transmission.