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GNSS/INS is the hybrid navigation system that merges Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) to provide continuous, as well as precise positioning and attitude information. GNSS uses satellite signals for global positioning; INS employs accelerometers and gyroscopes built into its mechanism for self-sensing, motion tracking without reliance on any external signal. The integration of such technologies within a single system enables not only high-precision navigation but also seamless relaying whenever satellite signals become restricted or interrupted so that continuity and stability in navigation can be maintained.

GNSS/INS delivers greater robustness in navigation when compared with standalone systems, and, consequently, environmental adaptability. It can use the INS for the duration that is characterized by intense blockage of satellite signals in such places as city streets, tunnels, forests, and even underwater to guarantee system failure will not occur. When the satellite signal returns fusion algorithm immediately corrects accumulated errors from INS thus making long-term stability much better as well as accuracy of navigation data overall.

GNSS/INS fused navigation finds its applications in aircraft, land-based autonomous vehicles, marine vessels, agricultural machinery navigators, surveyors, and mappers. Intelligent transportation, precision agriculture, and unmanned system development give rise to systems demanding such high levels of accuracy along with reliability and latency in data output-from centimeter level positioning to complex trajectory tracking. GNSS/INS will continue to be the core enabler of intelligent perception and high-precision navigation systems as long as fusion algorithms and sensor technologies are constantly upgraded.