Studies on Navigational Satellite Visibility and Signal Strength of Different GNSS Sensor

This paper investigates the performance of multi-GNSS systems using Android smartphones. By comparing signal strength (SNR) and satellite availability across different devices and constellations (GPS, GLONASS, Galileo, BeiDou, and QZSS), the study highlights the capability of smartphones in capturing high-quality GNSS signals. Results show that modern smartphones, particularly those with single/dual-frequency GNSS chipsets, track nearly 50 satellites simultaneously, with BeiDou and GPS generally offering the strongest signals. Additionally, smartphone GNSS sensors demonstrated signal strength values closely matching those of high-grade receivers, underscoring their growing reliability for precise positioning in various applications.