NO INFRASTRUCTURE POSITIONING SYSTEMS
There are also solutions to compute position of an object without dedicated hardware
GSM BASED POSITIONING SYSTEMS
There are possible techniques of positioning based on the GSM infrastructure:
- Enhanced observed time difference exploits the number of base stations in visibility (3 minimum)
- Timing advance this technique exploits handover
BLUETOOTH BASED POSITIONING SYSTEMS
One possible solution is to exploits the limited range of Bluetooth devices and is low costs to implement a proximity based positioning system.
One possible solution is to place Bluetooth devices at the point of interests (PoI) and devices can compute their position by connecting to a BT POI and computing the RSSI
This method allow different levels of privacy for the device that can scan in silent mode the PoI