ground reference stations

Ground reference stations are specialized monitoring sites positioned on the Earth's surface that track satellite signals used for navigation and positioning systems like GPS. They serve as stable reference points, continuously measuring the signals' accuracy and environmental influences, such as atmospheric conditions. This data helps identify and correct errors in satellite signals, ensuring that GPS devices provide precise location information. Essentially, ground reference stations act as ground-based benchmarks, enabling improved accuracy and reliability of satellite-based positioning across different areas.