GAARDIAN - GNSS Availability, Accuracy, Reliability anD Integrity Assessment for timing and Navigation

关键基础设施应用（如运输、电信、公用事业、安全和海事）需要实时和持续地了解使用附近的PNT数据的可靠性和质量（完整性）-这是目前无法实现的。GAARDIAN建议开发新的方法，用于实时，自主，连续和准确地收集和过滤3个独立的巨大的定位，导航和定时（PNT）数据集，并在复杂/困难的环境中，以实现PNT数据的鲁棒，实时和连续的质量（完整性）保证。由于天气、建筑物阴影、无线电干扰、平台不稳定性和不可访问性，建筑物和海洋环境都很复杂，并对空间时间参考PNT传感器数据的无缝捕获提出了重大挑战。此外，实时监测来自多个来源的连续PNT质量数据会产生太多的数据，无法以成本效益高的方式与中央数据库进行通信，并由中央数据库进行管理。因此，必须创建新的数据简化方法。该项目将开发智能、自适应的本地化数据收集（包括学习正常数据特征和自主调整阈值）、存储和过滤的新方法，这对所确定的市场至关重要。减少的数据将被传送回中央服务器，以允许用户访问PNT质量监控。在使用点可靠的PNT完整性保证需要3个独立的定时或导航数据参考，以识别和减轻PNT信号的干扰或干扰的存在。该项目将研究为此目的使用eLoran、全球导航卫星系统和定时信号，以收集精确和明确的数据。GAARDIAN将使用户能够基于明确的本地化PNT完整性（质量）知识可靠地做出关键运营决策。

Critical infrastructure applications (e.g. transport, telecoms, utilities, security and maritime) require real-time and continuous localised knowledge of the reliability and quality (integrity) of PNT data in the vicinity of use - this is not available today. GAARDIAN proposes to develop novel methods for real-time, autonomous, continuous and accurate gathering and filtering of 3 independent enormous sets of Positioning, Navigation and Timing (PNT) data nationally and in complex/difficult environments, to enable robust, real-time and continuous quality (integrity) assurance of PNT data. Both the built and marine environments are complex and offer significant challenges to the seamless capture of spatio temporally referenced PNT sensor data due to weather, building shadow, radio interference, platform instability and inaccessibility. In addition, real-time monitoring of continuous PNT quality data from multiple sources creates far too muchdata to be communicated cost-effectively to, and be managed by, a central database. Hence, novel data reduction methods must be created. The project will develop new methods for intelligent, adaptive localised data gathering (including learning normal data signatures and adjusting thresholds autonomously), storage and filtering - critical to the markets identified. Reduced data will be communicated back to a central server to allow user access for PNT qualitymonitoring. Reliable PNT integrity assurance at point of use requires 3 independent timing or navigation data references to identify and mitigate the presence of interference or jamming of the PNT signals. The project will investigate the use of eLoran, GNSS and timing signals for this purpose, to gather precise and unambiguous data. GAARDIAN will enable users to reliably make critical operational decisions based on unambiguous localised PNT integrity (quality) knowledge.