MRI: Acquisition of a Full-Wave Interferometric Digital Radio System For Space Research and University Education

MRI：获取用于空间研究和大学教育的全波干涉数字无线电系统

• 批准号: 0722562
• 负责人: Brett Isham
• 金额: $ 22.6万
• 依托单位: Inter American University of Puerto Rico San Juan
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0722562&HistoricalAwards=false
• 关键词: MRI; Acquisition; Full; Wave; Interferometric

This project is to fund the acquisition of a state-of-the-art multi-point digital radio system consisting of four antennae and their associated receivers and electronics. The system would initially be divided into a three-point interferometer to be deployed in the field during observational campaigns, and a fourth point to be located at the Interamerican campus in Bayamón, Puerto Rico. The equipment would be applied to study how a high-power radio wave, directed into the ionosphere, creates turbulent electron and ion plasma waves, stimulated radio emissions, and streams of high-energy electrons. These processes occur within high-temperature gases, known as plasmas and consisting of energetic free electrons and positive ions. Most plasmas contain a magnetic field which is also important to the physics. This is the case in the Earth's local space environment, and a principle objective is to use the Earth's magnetic field as a geometric probe through observations of the variation in the artificially pumped plasma turbulence as a function of angle. The three-point interferometric configuration would follow changes in stimulated radio emissions with respect to the geomagnetic field direction. In addition, the 3-D full-wave antennas would completely specify the electric and magnetic fields of the radio signals, something not possible with single or dual-polarization equipment. This is an emerging electromagnetic technology and will certainly lead to new discoveries in the physics of plasmas and radiation. The radio techniques will be combined with advanced incoherent scatter radar measurements and collaborative coherent radar and optical observations to study a range of turbulent processes including the relative importance of Langmuir versus upper-hybrid turbulent effects, a key question in this field. The observations will be carried out at the EISCAT mainland and Svalbard observatories in Scandinavia, the UK/Chinese SPEAR and Russian Barentsburg research facilities on Svalbard, and later at the HAARP and/or HIPAS observatories in Alaska and possibly at the Arecibo Observatory in Puerto Rico. The observations will be leveraged by comparison with results from modeling and simulation codes. The Interamerican University of Puerto Rico campus in Bayamón is a private undergraduate institution with 99% Hispanic, mostly low-income students. Four Bayamón undergraduates are participating in this research. The instrumentation would support the research infrastructure at Interamerican in Bayamón, adding value to a new space research faculty position to be filled in August 2007, and providing laboratory opportunities in the undergraduate teaching and research program and in the development of an MS graduate electrical engineering degree program. The project promotes collaborations internationally, nationally, and within Puerto Rico. In addition to publications and professional conferences, outreach efforts will include annual public seminars by eachproject participant, to be held in schools, at community events, and in other public forums.

该项目将为购置最先进的多点数字无线电系统提供资金，该系统由四个天线及其相关接收器和电子设备组成。该系统最初将分为一个三点干涉仪，将在观测运动期间部署在现场，第四个点将设在波多黎各Bayamón的美洲校园。该设备将用于研究高功率无线电波如何进入电离层，产生湍流电子和离子等离子体波，刺激无线电发射和高能电子流。这些过程发生在被称为等离子体的高温气体中，由高能自由电子和正离子组成。大多数等离子体都含有磁场，这对物理学也很重要。这是地球局部空间环境的情况，一个主要目标是利用地球磁场作为几何探针，通过观察人工泵送等离子体湍流随角度的变化。三点干涉配置将遵循受激无线电发射相对于地磁场方向的变化。此外，三维全波天线将完全确定无线电信号的电场和磁场，这是单极化或双极化设备无法做到的。这是一项新兴的电磁技术，肯定会导致等离子体和辐射物理学的新发现。无线电技术将与先进的非相干散射雷达测量、协同相干雷达和光学观测相结合，研究一系列湍流过程，包括Langmuir与上层混合湍流效应的相对重要性，这是该领域的一个关键问题。这些观测将在位于斯堪的纳维亚半岛的EISCAT大陆和斯瓦尔巴群岛天文台、位于斯瓦尔巴群岛的英国/中国SPEAR和俄罗斯巴伦支堡研究设施、随后在阿拉斯加的HAARP和/或HIPAS天文台以及可能在波多黎各的阿雷西博天文台进行。观测结果将与建模和仿真代码的结果进行比较。波多黎各泛美大学位于Bayamón的校园是一所私立本科院校，99%的学生是西班牙裔，主要是低收入家庭的学生。四位Bayamón本科生参与了本研究。该仪器将支持Bayamón的泛美研究基础设施，为2007年8月将填补的新空间研究教员职位增加价值，并为本科教学和研究计划以及硕士研究生电子工程学位计划的发展提供实验室机会。该项目促进国际、国内和波多黎各内部的合作。除了出版物和专业会议外，外联工作还将包括由每个项目参与者在学校、社区活动和其他公共论坛举行的年度公开研讨会。