Use-case and Technology Evaluation for UK CNI Time and Frequency Dissemination using the existing 198kHz broadcast network

ArQiva、BBC和Chronos希望评估现有的198 kHz基础设施的使用情况，该基础设施目前用于BBC广播4长波服务的音频广播，还可以将时间和频率传播到低成本、固定位置的接收器，适用于包括关键国家基础设施在内的应用。如果198 khz系统可以进行修改以获取准确的时间信号，这将是显著的优势。*基础设施已经存在，可以快速升级*完全基于英国的解决方案*陆地而不是空间，因此，对GNSS的关键创新是对系统的修改，增加了带有附加信息的准确时间信号，以便接收器能够将来自现有发射站的信号去相关，并产生低于1微秒的精确时间历元。*组成198千赫网络的站点与UTC同步*修改198千赫信号以添加时间信号和帮助信息*为几个终端设备使用案例建立链路预算，以满足特定的潜在客户要求

Arqiva, the BBC and Chronos want to evaluate the use of the existing 198 kHz infrastructure, currently used for audio broadcasting of the BBC's Radio 4 Longwave service, to also disseminate time and frequency to low cost, fixed location receivers suitable for applications including Critical National Infrastructure.If the 198 kHz system can be modified to take an accurate time signal there are significant advantages.* The infrastructure already exists and can be upgraded quickly* Wholly UK-based solution covering the UK landmass* Terrestrial and not space based, thus complementary to GNSSThe key innovation is the modification of the system to add an accurate time signal with the additional information for a receiver to be able to decorrelate the signals from the existing transmitter sites and generate a sub one microsecond accurate time epoch.?The evaluation will look at;* Synchronisation of the sites that make up the 198?kHz network with UTC* The modification of the 198 kHz signal to add the time signal and helper information* Building link budgets for several end device use cases to serve specific potential customer requirements