GNSS Position Correction Using Base Station Difference Data

The patent introduces base stations as intermediary devices that receive GNSS signals, calculate positioning differences between their known precise locations and GNSS-derived positions, and broadcast correction information to mobile terminals. This mediator approach enables accurate positioning without requiring expensive specialized equipment in each terminal, resolving the contradiction between measurement precision and device complexity.

The system enables mobile terminals to self-correct their positioning errors by receiving and applying correction values from base stations. Each terminal independently calculates its corrected position using the broadcast correction information, eliminating the need for complex centralized processing or expensive onboard correction systems, thus reducing device complexity while maintaining high accuracy.

The patent implements a feedback mechanism where base stations continuously monitor the difference between their known precise positions and positions derived from GNSS signals, then broadcast correction information back to mobile terminals. This feedback loop compensates for systematic errors in weak signal environments, enabling accurate positioning even when satellite reception is poor, thus resolving the contradiction between coverage and accuracy.

Base stations serve as intermediaries that bridge the gap between GNSS signals and accurate positioning in challenging environments. By receiving strong reference signals at fixed locations with known coordinates, base stations can compute and distribute correction values that improve terminal positioning accuracy even when terminals themselves experience weak satellite signals, extending reliable service coverage to areas previously unsuitable for accurate GNSS positioning.