To do this, DARPA will need an orbiting space robot, or a "tender" spacecraft, that can make all of this happen on orbit. Like an automated mechanic, the tender would rendezvous with "satlets" (those are the small satellite "brains") that would likely hitch rides on other satellite launches. It would then remove the satlets from the larger satellite or launch vehicle and carry the satlets to a dead satellite where it would attach the satlet to a used antenna and then cut the antenna loose from its former satellite. The tender would then place the new satlet-antenna combo in its new orbit. Just like that, the tender will have built a new satellite from old parts already available in space, limiting the amount of new debris introduced into orbit.