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Precise-timing applications for GPS

GPS 精确授时应用

基本信息

批准号：
ST/H003770/1
负责人：
Cathryn Mitchell
金额：
$ 10.82万
依托单位：
University of Bath
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=ST%2FH003770%2F1
关键词：
Precise timing applications GPS

项目摘要

Since the introduction of commercial Global Positioning System (GPS) products onto the market in the mid-1990's, the take-up of the technology and its integration into a wide range of consumer goods (e.g. cameras, telephones) has been phenomenal with millions of GPS units being sold annually. The measurement accuracy of GPS receivers has improved significantly and whilst adequate for most applications, further refinements are possible where greater accuracy is required. The objective of the project covered by this proposal is to investigate the commercial potential of an enhanced GPS timing/navigation receiver using an approach that has developed from ionospheric physics research undertaken by the University of Bath. GPS signals are affected by propagation through the ionosphere and this distortion represents the largest component in the overall GPS error budget. The existing ionospheric model (created in the late 1980's) broadcast by the GPS system has been shown to be unreliable under variable ionospheric conditions. There are periods during which the Sun emits larger quantities of radiation, which has a direct impact on the Earth's Ionosphere and can give rise to ionospheric storms, which can seriously disrupt radio waves, eg. GPS signals. The University of Bath has developed the Multi-Instrument Data Analysis System (MIDAS) which, taking input from a number of freely available real-time sources across Europe and N. America, is capable of producing real-time 3D ionospheric maps over geographic areas of interest. It has been demonstrated that by using this real-time mapping a more accurate, stable and reliable single-frequency GPS timing/navigation solution can be computed. This real-time map could be radio broadcasted, or made available via the internet and make it possible to achieve timing accuracies to within 10 ns.

自从1990年代中期将商用全球定位系统（GPS）产品引入市场以来，该技术的采用及其与广泛的消费品（例如照相机、电话）的集成已经是惊人的，每年销售数百万个GPS单元。全球定位系统接收器的测量精度已大大提高，虽然足以满足大多数应用，但在需要更高精度的情况下，还可以进一步改进。本提案所涉项目的目标是，利用巴斯大学开展的电离层物理学研究所形成的方法，调查增强型全球定位系统定时/导航接收器的商业潜力。全球定位系统信号受到通过电离层传播的影响，这种失真是全球定位系统总误差预算中最大的部分。由全球定位系统广播的现有电离层模型（创建于1980年代后期）已被证明在可变的电离层条件下不可靠。在某些时期，太阳会发出大量的辐射，对地球的电离层产生直接影响，并可能引起电离层风暴，这会严重干扰无线电波，例如。GPS信号。巴斯大学开发了多仪器数据分析系统（MIDAS），该系统从欧洲和北美的许多免费实时来源获取输入。美国，能够在感兴趣的地理区域制作实时3D电离层地图。已经证明，通过使用这种实时映射，可以计算出更准确、稳定和可靠的单频GPS定时/导航解。这种实时地图可以通过无线电广播，或者通过互联网提供，并且可以实现10 ns以内的定时精度。