增强罗兰系统发展评述与一体化备份标准构建:从能力分析到体系框架OA

To address the vulnerability of GNSS to interference and spoofing,as well as the insufficient resilience of a single positioning,navigation and timing(PNT)system,and to meet the demand for high-reliability PNT services in critical industries,we investigated the backup support role and upgrade directions of Enhanced Long-Range Navigation(eLoran)within the national comprehensive PNT system.Taking the regional navigation anomaly event in Nanjing as a case study,we reviewed the technical principles and development status of eLoran.We analyzed its key bottlenecks from five aspects:signal structure,broadcasting capability,system architecture,device ecosystem,and management mechanisms.We proposed an upgrade pathway oriented toward"ubiquitous coverage,security and trustworthiness,and demand-driven services"and constructed an integrated backup standard.The results show that eLoran possesses advantages of high anti-interference capability,heterogeneous redundancy,and independent timing,enabling it to provide continuous and reliable backup PNT services when GNSS fails.Moreover,its integration with BeiDou Navigation Satellite System(BDS)and communication networks can form a multi-source collaborative spatiotemporal service system.We conclude that eLoran is a key technology for enhancing the security resilience of the national PNT system,and its systematic construction and industrialization are of significant strategic importance for building modern spatiotemporal infrastructure.