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L2-校准卫星：用于超灵敏宇宙微波背景偏振空间任务的校准卫星。

L2-CalSat: A Calibration Satellite for Ultra-Sensitive CMB Polarization Space Missions.

作者信息

Casas Francisco J, Martínez-González Enrique, Bermejo-Ballesteros Juan, García Sergio, Cubas Javier, Vielva Patricio, Barreiro Rita B, Sanz Angel

机构信息

Instituto de Física de Cantabria (IFCA), CSIC-UC, Avda. de los Castros s/n, 39005 Santander, Spain.

Instituto Universitario Ignacio Da Riva (IDR/UPM), Universidad Politécnica de Madrid, Plaza Cardenal Cisneros, 3, 28040 Madrid, Spain.

出版信息

Sensors (Basel). 2021 May 12;21(10):3361. doi: 10.3390/s21103361.

DOI:10.3390/s21103361
PMID:34066074
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8151417/
Abstract

In this work, the use of a calibration satellite (L2-CalSat) flying in formation with a Cosmic Microwave Background (CMB) polarization mission in an orbit located at the second Lagrange point, is proposed. The new generation of CMB telescopes are expected to reach unprecedented levels of sensitivity to allow a very precise measurement of the B-mode of polarization, the curl-like polarization component expected from gravitational waves coming from Starobinski inflationary models. Due to the CMB polarized signal weakness, the instruments must be subjected to very precise calibration processes before and after launching. Celestial sources are often used as external references for calibration after launch, but these sources are not perfectly characterized. As a baseline option, L2-CalSat is based on the CubeSat standard and serves as a perfectly known source of a reference signal to reduce polarization measurements uncertainty. A preliminary design of L2-CalSat is described and, according to the scanning strategy followed by the telescope, the influence of the relative position between the spacecrafts in the calibration process is studied. This new calibration element will have a huge impact on the performance of CMB space missions, providing a significant improvement in the measurements accuracy without requiring new and costly technological developments.

摘要

在这项工作中，提出了使用一颗校准卫星（L2-CalSat），它将与位于第二拉格朗日点轨道上的宇宙微波背景（CMB）偏振任务卫星编队飞行。新一代的CMB望远镜有望达到前所未有的灵敏度水平，以便能够非常精确地测量偏振的B模式，即来自斯塔罗宾斯基暴胀模型的引力波所预期的类似旋度的偏振分量。由于CMB偏振信号较弱，仪器在发射前后必须经过非常精确的校准过程。天体源在发射后常被用作校准的外部参考，但这些源的特性并不完美。作为一个基线选项，L2-CalSat基于立方星标准，作为一个完全已知的参考信号源，以降低偏振测量的不确定性。文中描述了L2-CalSat的初步设计，并根据望远镜所采用的扫描策略，研究了航天器之间相对位置在校准过程中的影响。这种新的校准元件将对CMB空间任务的性能产生巨大影响，在无需新的昂贵技术研发的情况下，显著提高测量精度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/7c2b91a2eb0d/sensors-21-03361-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/0c5ec146651f/sensors-21-03361-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/848679b91745/sensors-21-03361-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/20694299e086/sensors-21-03361-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/76d6361f5976/sensors-21-03361-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/34a3b9349c50/sensors-21-03361-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/a128257b6aa9/sensors-21-03361-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/c1915484eb94/sensors-21-03361-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/e36796bb17be/sensors-21-03361-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/7c2b91a2eb0d/sensors-21-03361-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/0c5ec146651f/sensors-21-03361-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/c9dc3e52ef19/sensors-21-03361-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/f11ee4fb28c9/sensors-21-03361-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/bceff14b361b/sensors-21-03361-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/848679b91745/sensors-21-03361-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/20694299e086/sensors-21-03361-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/76d6361f5976/sensors-21-03361-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/34a3b9349c50/sensors-21-03361-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/a128257b6aa9/sensors-21-03361-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/c1915484eb94/sensors-21-03361-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/e36796bb17be/sensors-21-03361-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d33/8151417/7c2b91a2eb0d/sensors-21-03361-g012.jpg

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