Vehicle Internet Links using Infra-Red transmission of Information (VILIRI)

英国铁路上只有三分之一的乘客对火车上的wifi服务感到满意。人们越来越希望无论走到哪里，都能享受免费可靠的互联网服务，而火车旅行打断了他们在生活方式和工作中所看重的娱乐和交流，这让他们感到沮丧。这个问题不是由于缺乏关注。政府知道这对人们有多重要，并呼吁铁路特许经营权从2020年开始包括免费wifi。尽管该计划本身将保证人均网速不超过1mbps，但它向铁路运营商发出了一个明确的信号，这些运营商迄今为止发现，在特许经营合同的期限内，很难证明投资基础设施是合理的。网络铁路基础设施有限公司（NRIL）是英国大多数铁路基础设施的所有者和运营商，并且站在尝试为这一市场失灵寻找创新解决方案的最前沿。HS2是英国下一个主要的铁路基础设施项目，也是证明高带宽、可靠的全程互联网服务的绝佳机会。VILIRI的方法是基于光学无线通信（OWC），利用红外（IR）频率以每秒10gb （10Gbps）的速度在列车和轨道之间发送数据。这对所有类型的互联网浏览、实时通信和每位乘客的有效无限容量来说都绰绰有余。创新之处在于，它使用了高度集中的先进光学器件和精心匹配的传感器，可以接收低功率红外信号，并对其进行可靠的实时处理。这就需要在列车上和轨道上安装收发器，以便每个收发器按视线依次传输数据。可实现的服务质量将支持业务通信和安全闭路电视图像传输，例如，以及为乘客提供信息和互联网。该项目将通过先进的信号处理和必要的多通道来增强光链路的能力。将采取措施确保光学元件在所有天气下保持清洁和清晰。最重要的是，安装该系统作为铁路基础设施的一部分的商业案例将由额外的互联网服务带来的收入来支付，而乘客则可以享受基本的互联网服务而无需直接收费。在为信号和其他功能铺设光纤的情况下，互联网连接将降低资本成本。

Only a third of passengers on the UK's railways seem happy with the wifi service they receive on the train. People increasingly expect free and reliable internet wherever they go and are frustrated that train journeys interrupt the entertainment and communications they value for lifestyle and work.The problem is not for lack of attention. The Government knows how much this matters to people and has called for rail franchises to include free wifi from 2020\. Although the initiative itself will guarantee no more than 1 Mbps per head, it sends a clear signal to the train operators who have so far found it difficult to justify investment in the infrastructure needed over the timeframe of the franchise contracts. Network Rail Infrastructure Limited (NRIL) is the owner and operator of most of the rail infrastructure in Great Britain and is at the forefront of attempts to find innovative solutions for this market failure.HS2 is the next major railway infrastructure project in the UK and an excellent opportunity to prove high bandwidth, reliable internet services for entire journeys. VILIRI's approach is based on Optical Wireless Communications (OWC) that uses Infra-Red (IR) frequencies to send data between train and trackside at 10Gigabits per second (10Gbps). This is more than enough for all types of internet browsing, real time communications and effectively unlimited capacity for each passenger.The innovation is to use advanced optics with high levels of concentration and carefully matched sensors that can take low power IR signals and process them reliably in real time. This needs transceivers on the train and along the track so that data is transferred by line of sight from each transceiver in turn. The quality of service achievable will support operational communications and security CCTV picture transfers, for example, as well as information and internet for the passengers.The project will enhance the capability of the optical links by advanced signal processing and multiple channels where needed. Care will be taken to ensure that the optics remain clean and clear in all weathers. Most importantly, the business case for installing the system as part of the railway infrastructure will be covered by the revenue that additional internet services will bring while passengers enjoy the basic internet service without direct charges. Capital costs will be reduced by internet connection within the provision of optical fibre that has to be laid for signalling and other functions.