Geospatial Position Accuracy Improvement

GPAI项目使用地理空间数据和创新的定位系统来解决Network Rail交通方面的挑战Network Rail运营和维护英国的大部分铁路网。该公司正大举投资于技术，以提高产能。例如，数字信号、交通管理和列车自动运行。这些技术需要准确的列车位置才能运行。不幸的是，GPS在铁路环境中不能很好地运行，那里有深路基、隧道、有盖的车站和许多阻碍信号或引起反射的结构。即使有良好的卫星能见度，当有多个平行轨道时，精度通常也不足以确定列车占据的是哪条轨道。因此，Network Rail不得不使用昂贵的基于基础设施的系统来定位列车，包括应答器、计轴器和轨道电路。网络铁路信号创新小组(SIG)参与确定和验证这些基础设施系统的位置。对它们的位置越有信心，控制系统设计中需要建立的误差就越小，可以实现的运力就越大。为了进行这些测量，Network Rail目前运行的专业工程列车运营成本很高，而且由于它们的存在，减少了可供客运服务的轨道运力。SIG希望改用安装在客运列车车头上的低成本测量设备。然而，由于GPS的限制，它无法将列车定位到足够的精度。因此，它正在寻求解决方案，以将基于GPS的低成本定位系统的精度提高到1米以内。GPAI项目：地理空间位置精度改进是一项拟议的服务，通过在同一路线上重复运行来改进对列车位置的估计。它特别适合于每天进行类似旅程的客运列车。这一改进是通过创新地使用RDS International开发的视频列车定位系统实现的。VTPS是一种从前置摄像头使用实时图像处理来定位列车的技术。该项目将通过以下开发来研究GPAI的可行性：需求和商业案例概念演示的证明技术和商业路线进入市场。该项目将由RDS牵头，Network Rail、One Big Circle和Porterbrook提供支持。

Public descriptionThe GPAI project uses geospatial data and an innovative positioning system to solve a Network Rail transport challengeNetwork Rail operates and maintains most of Great Britain's rail network. It is investing heavily in technology to increase capacity. Examples include digital signalling, traffic management and automatic train operation.These technologies require accurate train location to operate. Unfortunately, GPS does not operate well in the rail environment with deep cuttings, tunnels, covered stations and many structures blocking the signal or causing reflections. Even with good satellite visibility, accuracy is very often insufficient to determine which track a train is occupying when there are multiple parallel tracks. Consequently, Network Rail has to use expensive infrastructure-based systems to locate the train, including transponders, axle counters and track circuits.Challenge. The Network Rail Signalling Innovations Group (SIG), is involved in determining and validating the location of these infrastructure systems. The greater the confidence in their location, the smaller the error margin that needs to be built into the control system design and the greater the capacity that can be achieved.To make these measurements, Network Rail currently runs specialist engineering trains which are expensive to operate and, by their presence, reduce the track capacity available for passenger services. SIG wishes to move to low cost survey equipment mounted on the front of passenger trains. However, because of GPS limitations, it is not able to position the train to sufficient accuracy. It is therefore seeking solutions to improve the accuracy of low cost GPS-based location systems to within 1m.GPAI Project: Geospatial Position Accuracy Improvement is a proposed service that improves estimates of train location through repeat runs over the same route. It is particularly suited to passenger trains that make similar journeys on a daily basis. The improvement is achieved through innovative use of the Video Train Positioning System developed by RDS International. VTPS is a technology that locates a train using real-time image processing from a forward facing camera.The project will investigate GPAI feasibility through development of:requirements and business caseproof of concept demonstratortechnical and commercial routes to market.The project will be led by RDS, supported by Network Rail, One Big Circle and Porterbrook.