南京区域导航失灵，原因公布

Core Viewpoint - The article discusses the navigation signal anomalies that occurred in Nanjing on December 17, 2025, clarifying the technical reasons behind the issue and emphasizing the strategic significance of the BeiDou and GPS systems' compatibility [1]. Group 1: Navigation Signal Anomaly - The core reason for the navigation failure was temporary interference suppressing GNSS satellite signals (including BeiDou and GPS), rather than a network signal interruption, making offline maps ineffective [1][3]. - Offline maps only store geographic data and cannot replace the positioning signal source, as mobile navigation relies on GNSS signals from at least four satellites to calculate location coordinates [3]. Group 2: Strategic Significance of BeiDou and GPS Compatibility - The simultaneous impact on both BeiDou and GPS signals during the anomaly validates the forward-looking strategic vision of China's BeiDou system's civilian frequency planning [1]. - The compatibility of BeiDou's civilian signal (B1C band) with GPS's civilian signal (L1C band) breaks the spectrum resource blockade and creates a strategic balance, where interference with BeiDou also affects GPS applications, enhancing security for civilian navigation services [3]. Group 3: Military Frequency Resilience - The BeiDou system employs a military-civilian frequency separation design, with military frequencies being exclusive and physically isolated from civilian bands, ensuring strong anti-jamming capabilities [3]. - The military system incorporates advanced anti-jamming technologies and algorithms, providing stable and reliable time-space services for national defense and emergency support, unaffected by the civilian signal interference [3].