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Borehole location monitoring using phase-sensitive FMCW radar

使用相敏 FMCW 雷达进行钻孔位置监测

基本信息

批准号：
NE/P003281/1
负责人：
Lai Bun Lok
金额：
$ 17.91万
依托单位：
University College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FP003281%2F1
关键词：
Borehole location monitoring using phase

项目摘要

Hot-water drilling is widely accepted to be the most viable method of creating deep boreholes through ice sheets rapidly and cleanly. Up to now, this process is still widely being undertaken 'blind' with little or no information made available to the drillers about the precise trajectory that a borehole is taking as it descends deeper into the ice. The negative consequences of doing this, especially when closely separated boreholes are involved, became evident after the ill-fated first attempt at drilling into Subglacial Lake Ellsworth (SLE). To help rectify this urgent need, the technological development in this project seeks to realise a novel application of phase-sensitive frequency modulated continuous wave (FMCW) radars with an active transponder, to measure from the ice surface the spatial position inside a borehole with centimetre-precision to depths of up to 3-km. It significantly builds upon the successful ApRES radar which has been recently designed and field proven for year-long, high precision measurement of Antarctic ice shelf basal melt rates. The concept of 1D-spatial location using the proposed technique of new phase-sensitive FMCW radars with active transponders is presently at the TRL2 level, in which the basic principles have been observed and reported; and a technology concept has been formulated based on the investigators' recent work at UCL. We now aspire to carry out research to take that concept to TRL4 and validate the technology for 3D-spatial location within a laboratory and outdoor setting. Once realised, the proposed technology could ultimately increase the likelihood of success in future attempts at gaining entry into SLE and other deep (>3000-m) subglacial environments to open up new avenues of scientific exploration. The availability of such an instrument would also address the immediate needs of researchers on both the BEAMISH and CryoEgg NERC-funded projects, who are both seeking an independent method of obtaining spatio-temporal datasets at specific locations at the ice-bed interface and the broader subglacial environment, respectively. The new experimental data provided by the proposed instrument will lead to improved fundamental understanding of the dynamics occurring beneath the polar ice sheets and sustain and boost the status of UK research in these areas to internationally-leading standards.

热水钻探被广泛认为是快速、清洁地在冰盖上钻出深井的最可行的方法。到目前为止，这一过程仍然被广泛地盲目进行，钻探人员很少或根本不能获得有关钻孔向下深入冰层时的准确轨迹的信息。在第一次尝试钻探冰下埃尔斯沃斯湖(SLE)失败后，这样做的负面后果变得明显，特别是当涉及到紧密相隔的井眼时。为了帮助纠正这一迫切需求，该项目的技术开发旨在实现具有有源应答器的相敏调频连续波(FMCW)雷达的新应用，从冰面以厘米精度测量钻孔内的空间位置，深度可达3公里。它在很大程度上建立在成功的APRES雷达的基础上，该雷达最近设计并经现场验证，可用于长达一年的高精度测量南极冰架基础融化速率。使用拟议的带有有源应答器的新型相敏FMCW雷达技术的一维空间定位概念目前处于TRL2级，其中的基本原理已得到观察和报告；并根据伦敦大学学院研究人员最近的工作制定了技术概念。我们现在渴望开展研究，将这一概念带到TRL4，并在实验室和室外环境中验证这项3D空间定位技术。一旦实现，这项拟议的技术最终可能会增加未来进入SLE和其他深度(&gt；3000米)冰下环境的成功可能性，以开辟科学探索的新途径。这种仪器的提供还将满足Beamish和CryoEgg NERC资助项目的研究人员的迫切需要，这两个项目都在寻求一种独立的方法，分别在冰床界面和更广泛的冰下环境的特定位置获得时空数据集。拟议仪器提供的新实验数据将有助于更好地了解极地冰盖下发生的动态，并维持和提高英国在这些领域的研究地位，使其达到国际领先标准。