As it stands right now your radar will pulse on the galaxy map showing locations (if any) that are in range and then wait until the pulse finishes to send another.
I like it, but I think a few changes can be made, and since I haven't seen much discussion on how radar works at the moment, I figured I'd kick it off with a few ideas of my own.
Static blips: Right now the radar blips fade out rather quickly, and so it can take some time to "home in" on the location, especially with long times between radar pulses. Instead of them fading out entirely I suggest showing them in a faded state, but not completely invisible between pulses, just to make finding them a little easier.
Hidden Sectors: Instead of simply being able to detect hidden mass signatures, maybe have an accuracy modifier in addition to the range. IE, Instead of knowing exactly what sector it is in, have your scanners pick up something "in this general area somewhere over there" in a 7x7 sector radius, with scanners that have lower accuracy, closing in with higher accuracy (1x1 sectors at 100%)
Long range radar can get you detected in hostile territory: The better your radar, the more likely someone is to detect you. This would make exploring a little more interesting in faction controlled sectors. If you have a low radar signature, maybe they'll send out a policing fleet to scout the area, if you have a REALLY good radar, then they'll send a battle-fleet to came and say Hi. I feel this would also be a good way to get the ball rolling on stealth mechanics later on.