There is a company. The company has thousands (tens of thousands) of objects, location of which would be useful to know (cars, forklifts, cranes, people, certain mechanisms, packaging of finished products, etc.) to Cling on each of these objects GPS silly: firstly, it is very expensive, and secondly they just steal.
I came up with the idea that maybe the technology exists locally determine the position of objects on the same principles on which is built the GPS\\Glonass: the corners of the enterprise installed a couple of pieces of local transmitters (their coordinates are precisely known and constant), and to monitored targets are hung the receivers.
At the same time:
1. The cost of receivers is lower because the signal need not catch from the flying devils-where satellites and transmitters that are within a couple hundred meters.
2. Steal receivers makes no sense — outside of the enterprise they are useless.
There is something like that in the ready (semi -)?