Collaborative Research: Advanced Digital Calibrators for 21cm Cosmology

合作研究:21cm宇宙学先进数字校准器

基本信息

  • 批准号:
    2107929
  • 负责人:
  • 金额:
    $ 35.53万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2021
  • 资助国家:
    美国
  • 起止时间:
    2021-09-01 至 2024-08-31
  • 项目状态:
    已结题

项目摘要

One of the greatest mysteries in modern cosmology is the Dark Energy-driven accelerating expansion of the Universe. Galaxy surveys have a unique capability to measure the expansion of the Universe that occurred long ago, enabling a sensitive measurement of the presence and characteristics of Dark Energy. Experiments have been undertaken with surveys of hundreds of thousands of galaxies using optical telescopes, but those surveys are still limited by the number of galaxies they can measure. Radio surveys can get around this limitation but require precise understanding of the instrument making the measurement. This proposal will develop new radio signal technology and techniques to improve the capability of current instruments to do these experiments and thus enable a better understanding of the nature of Dark Energy. The project looks to expand interaction with school teachers to enhance their knowledge of radio astronomy techniques that can be relayed to students in schools.The investigators will design, prototype, characterize, and deploy deterministic digital calibration signals for the purpose of improved calibration for 21 cm cosmology. New 21 cm interferometers require precise calibration, particularly of the instrument beam, to remove bright foregrounds and extract the cosmological signal of interest. Currently, the incoherent (power only) calibrators developed to address this challenge limit the dynamic range of the measurement and also have no direct sensitivity to instrument phase. The calibration source proposed here addresses these critical gaps to make full-sky, high signal-to-noise measurements of the complex (real and imaginary) instrument beam. The calibration source will produce a precise signal that can be correlated in the radio interferometer correlator, yielding a deterministic signal that can be used to make measurements of the beam in both phase and amplitude. The project includes an expansion of existing programs with educators in learning digital signal processing techniques.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
现代宇宙学中最大的谜团之一是暗能量驱动的宇宙加速膨胀。星系调查有一种独特的能力,可以测量很久以前发生的宇宙膨胀,从而对暗能量的存在和特征进行敏感的测量。人们已经利用光学望远镜对数十万个星系进行了调查实验,但这些调查仍然受到他们可以测量的星系数量的限制。无线电测量可以绕过这一限制,但需要对进行测量的仪器有精确的了解。该提案将开发新的无线电信号技术和技术,以提高现有仪器进行这些实验的能力,从而更好地了解暗能量的本质。该项目旨在扩大与学校教师的互动,以提高他们对射电天文学技术的知识,并将其传授给学校的学生。研究人员将设计、原型、表征和部署确定性数字校准信号,以改进21厘米宇宙学的校准。新的21厘米干涉仪需要精确的校准,特别是仪器光束的校准,以去除明亮的前景并提取感兴趣的宇宙信号。目前,为解决这一挑战而开发的非相干(仅功率)校定器限制了测量的动态范围,并且对仪器相位没有直接灵敏度。本文提出的校准源解决了这些关键间隙,以对复杂(实和虚)仪器光束进行全天高信噪比测量。校准源将产生一个精确的信号,可以在无线电干涉仪相关器中进行相关,产生一个确定性信号,可用于测量波束的相位和幅度。该项目包括扩展现有的教育工作者学习数字信号处理技术的项目。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

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Laura Newburgh其他文献

Beam Maps of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) Measured with a Drone
用无人机测量的加拿大氢强度测绘实验 (CHIME) 的波束图
  • DOI:
  • 发表时间:
    2024
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Will Tyndall;A. Reda;J. Richard Shaw;K. Bandura;Arnab Chakraborty;E. Kuhn;Joshua MacEachern;J. Mena;Laura Newburgh;A. Ordog;T. Pinsonneault;A. Polish;Benjamin R. B. Saliwanchik;P. Sanghavi;Seth R. Siegel;Audrey Whitmer;D. Wulf
  • 通讯作者:
    D. Wulf

Laura Newburgh的其他文献

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{{ truncateString('Laura Newburgh', 18)}}的其他基金

Collaborative Research: Cosmology with CHIME
合作研究:与 CHIME 的宇宙学
  • 批准号:
    2006911
  • 财政年份:
    2020
  • 资助金额:
    $ 35.53万
  • 项目类别:
    Standard Grant
CAREER: Towards Dark Energy -- A High-precision Drone-based Calibrator for Next-Generation 21cm Cosmology Experiments
职业:迈向暗能量——用于下一代 21 厘米宇宙学实验的高精度无人机校准器
  • 批准号:
    1751763
  • 财政年份:
    2018
  • 资助金额:
    $ 35.53万
  • 项目类别:
    Continuing Grant

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