南京区域导航失灵，原因公布

Core Viewpoint - The navigation signal anomaly in Nanjing on December 17, 2025, was caused by temporary interference affecting GNSS satellite signals, not by network signal disruption [1] Technical Analysis - Offline maps cannot resolve the navigation anomaly as they only store geographic data and do not replace the need for positioning signals [2] - Mobile navigation relies on GNSS satellite signals (at least 4 satellites) to calculate position coordinates, making positioning signals and map data independent systems [2] - The interference specifically targeted the civilian frequency bands of Beidou and GPS, preventing the receiver from recognizing the positioning signals, leading to issues like position drift and lack of data feedback [2] Strategic Significance of Beidou and GPS Compatibility - The simultaneous impact on Beidou and GPS signals during the anomaly validates the strategic foresight of China's Beidou system in planning civilian frequency bands [3] - The international satellite navigation spectrum follows a "first come, first served" rule, with GPS having occupied core L-band resources early on, leaving limited quality spectrum for Beidou [3] - 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 [3] Military Frequency Resilience - The signal anomaly only affected civilian GNSS frequency bands, while Beidou's military frequencies remained unaffected [4] - Beidou employs a military-civilian frequency separation design, with military frequencies being exclusive and physically isolated from civilian bands [4] - The military system incorporates advanced anti-jamming technologies, ensuring strong resilience against interference and deception [4] Industry Engagement - The Nanjing Satellite Application Industry Association will continue to build communication bridges between enterprises and the government, encouraging active participation from relevant companies [5]