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198khz基础设施的使用情况，该基础设施目前用于BBC Radio 4长波服务的音频广播，还可以将时间和频率传播给低成本的固定位置接收器，适用于包括关键国家基础设施在内的应用。如果可以对198khz系统进行修改以获取精确的时间信号，则具有显著的优势。*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，覆盖英国大陆*地面而不是天基，因此与gnss互补关键创新是对系统进行修改，以添加精确的时间信号和额外的信息，以便接收器能够从现有的发射机站点解除信号的关联，并生成低于一微秒的精确时间纪元。评估将着眼于；*组成198？*修改198 kHz信号以添加时间信号和辅助信息*为几个终端设备用例构建链路预算，以满足特定的潜在客户需求

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