Satellite navigation systems is an interdisciplinary research domain focused on the design, implementation, analysis, and application of technologies that utilize signals from orbiting satellites to determine position, velocity, and precise time. This field investigates the principles of satellite-based radio navigation, including signal generation, transmission, propagation, reception, and processing, as well as system architecture, performance analysis, error modeling, and integrity assurance mechanisms. Key characteristics include its reliance on precise timing and complex signal processing, its integration of space and ground infrastructure, and its critical role in providing ubiquitous geospatial referencing and synchronization services. Its significance lies in enabling a vast array of applications across numerous sectors, from transportation and surveying to telecommunications and scientific research, making it a foundational technology for modern global infrastructure.