Critical infrastructure sectors, including energy, transportation, and communication, rely heavily on GNSS for synchronization, positioning, and timing functions. In the energy sector, GNSS signals are used for synchronizing power grid operations and managing distributed energy resources. GNSS security measures help prevent disruptions that could lead to power outages or equipment damage. In transportation, GNSS security ensures the safe and efficient operation of air traffic control systems, railway signaling systems, and intelligent transportation systems. For communication networks, GNSS signals provide the precise timing needed for synchronizing network elements and managing data transmission. Ensuring GNSS security in these sectors is essential for maintaining the stability and reliability of modern society's critical services.