南京导航集体失灵，原因公布：本次干扰精准针对北斗、GPS民用频段

Core Viewpoint - The Nanjing Satellite Application Industry Association addressed the navigation signal anomalies in Nanjing on December 17, 2025, clarifying that the issue was due to temporary interference with GNSS satellite signals, not a network signal interruption [2][4]. Group 1: Technical Analysis - Offline maps cannot resolve the navigation anomaly as the core issue is the interference with GNSS signals (including Beidou and GPS), making offline maps ineffective for navigation [3]. - The functioning of mobile navigation relies on GNSS satellite signals (at least four satellites) to calculate position coordinates, which are independent of map data [3]. - The interference specifically targeted the civilian frequency bands of Beidou and GPS, leading to unrecognized positioning signals, resulting in navigation failures even with offline maps [3]. Group 2: Strategic Significance - The simultaneous impact on both Beidou and GPS signals during the anomaly validates the strategic foresight of China's Beidou system in planning civilian frequency bands [4]. - 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 [4]. - The design of frequency compatibility serves as a strategic deterrent, as any interference with Beidou's civilian signals will also impact GPS applications, enhancing the security of civilian navigation services [4]. Group 3: Military Frequency Resilience - The navigation anomaly only affected civilian GNSS frequency bands, while Beidou's military frequencies remained unaffected [5]. - Beidou employs a military-civilian frequency separation design, ensuring military frequencies are isolated and secure from civilian disruptions [5]. - The military system incorporates advanced anti-jamming technologies, providing strong resilience against interference, which is crucial for national defense and emergency services [5]. Group 4: Industry Engagement - The Nanjing Satellite Application Industry Association will continue to monitor industry developments and share professional knowledge on satellite navigation technology to enhance public understanding [6]. - The association aims to facilitate communication between enterprises and the government, encouraging active participation from relevant companies without membership fees [6].