More precise, perhaps. There are a whole lot of GNSS satellites up there already, but they comprise four separate systems, so you need to know a lot of inter-sy

More precise, perhaps. There are a whole lot of GNSS satellites up there already, but they comprise four separate systems, so you need to know a lot of inter-system timing bias information in order to fuse them into one big effective constellation. If you meant a single LEO swarm operated by a single entity, yes that's possible too, and there are proposals to do it, because LEO birds can provide much stronger signals, you'd have a decent shot of it working indoors and stuff. But, the ground-segment necessary to keep track of the clocks on a large number of satellites would be formidable. They'd also be out of view of ground stations for a larger portion of their orbits (since they're so much lower), which means some new work in tracking the clock drift, which is one of the main limitations on accuracy.