Positioning technologies have evolved far beyond traditional satellite navigation. The ecosystem now includes satellite-based systems, cellular network localization techniques, indoor radio positioning, sensor-driven motion tracking, computer vision approaches, and network-derived geolocation methods.
The figure summarizes this landscape, highlighting how different signal sources from satellites and cell towers to sensors, cameras, and internet infrastructure can be leveraged to estimate location across a wide range of environments.
https://orcid.org/0000-0002-9097-2246

