Any RADAR possibility with a drone swarm?

I'm designing/developing a drone "swarm" that could serve as a "border" around my base. They will be spread on a surface of a sphere, center of the sphere will be the base. While I'm online, on my HUD, I could see any other ship that is closing to my base and dispatch drones or start my capital ship.

Are there any method to detect them programmatically? I know the raycasting feature of the camera, but it is not enough for such RADAR functionality. I understand that from Antennas I couldn't...

Any RADAR possibility with a drone swarm?