EAGER: Adapting the New Arecibo On-Dish High Frequency (HF) Transmitter System to Radar Mode

EAGER：将新的阿雷西博盘上高频 (HF) 发射机系统调整为雷达模式

• 批准号: 0957281
• 负责人: John Mathews
• 金额: $ 14.52万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-15 至 2014-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0957281&HistoricalAwards=false
• 关键词: EAGER; Adapting; New; Arecibo; Dish

The investigators will develop a radar capability for the new Arecibo high frequency (HF) ionospheric heating facility using off-dish interferometric receive techniques. They will also explore using an on-dish receive mode that would require a T/R (transmit/receive) switch. The off-dish interferometric receiver systems would employ small arrays of active antennas and, after the initial analog filtering, a fully digital receiver system. Both the on and off-dish receiver systems could be used simultaneously yielding the most sensitive system. This radar system will enable new science by adding capabilities to conduct studies of meteor physics. Recent discoveries have shown that the vast majority of meteoroids visible as radar meteors fragment rather than simply ablating. This process is a likely source of important nanometer ?dust? in the 80-130 km altitude region where meteors ablate. The radar would be used in conjunction with the 46.8 MHz and 430 MHz radars at Arecibo to explore fragmentation. The combined measurements would allow studies of the radiowave scattering mechanism in meteor trails, and the processes whereby meteors deposit important metals in the atmosphere. Other important science areas include studies of mid-latitude spread-F, sporadic-E instabilities, quasi-periodic echo (QPE) structures, low-altitude quasi-periodic echoes (LQPE) structures, and the D-region ionization enhancements associated with lightning. The instrument could also find application as an MST (Mesospheric-Stratospheric-Tropospheric) radar and as a potential transit solar corona radar at solar minimum. Extending the HF heater capabilities to include a radar mode will enable much new science from the Arecibo instrument cluster. The HF-radar will allow direct probing of D-region heating effects, and possibly detection of lightning-induced D-region ionization. The effort will provide new opportunities for student research involvement by further enabling common-mode multi-radar campaigns and by supporting on-going model development efforts. Undergraduate students will be involved in building and fielding the system that will be available to all user communities, including students from collaborating institutions.

研究人员将使用偏僻的干涉量学接收技术为新的Arecibo高频（HF）电离层加热设施开发雷达能力。 他们还将使用需要t/r（发送/接收）开关的偏见接收模式进行探索。偏离干涉测量接收器系统将采用少量的活动天线阵列，在初始模拟过滤后，将使用完全数字接收器系统。 ON和偏离接收器系统都可以同时使用最敏感的系统。 这种雷达系统将通过增加进行流星物理学的能力来实现新科学。 最近的发现表明，绝大多数的流星物体可见为雷达流星碎片，而不是简单地消融。这个过程可能是重要的纳米粉尘的来源？在80-130公里的高度区域，在那里流星消融。雷达将与Arecibo的46.8 MHz和430 MHz雷达结合使用，以探索碎片化。 合并的测量结果将允许对流星径径径散射机理进行研究，以及流星将重要金属沉积在大气中的过程。其他重要的科学领域包括研究中纬度扩散-F，散发性不稳定，准周期回声（QPE）结构，低空观的准周期回波（LQPE）结构以及与雷击相关的D区域电离增强措施。 该仪器还可以找到作为MST（中层 - 间隙 - 对流层）雷达的应用，并在太阳能最小值处找到了潜在的太阳能电晕雷达。 将HF加热器功能扩展到包括雷达模式的功能将使Arecibo仪表盘的许多新科学。 HF-radar将允许直接探测D-区域加热效应，并可能检测到闪电诱导的D区电离。 这项努力将通过进一步实现共同模式多雷达运动并支持正在进行的模型开发工作，为学生研究的参与提供新的机会。 本科生将参与建立和范围，包括所有用户社区，包括合作机构的学生。