Spectroradiometer spectral calibration, ISRFshapes and related uncertainties

2021 ◽  
Author(s):  
Simon Trim ◽  
Kimberley Mason ◽  
Andreas Hueni
Keyword(s):  
Spectral Calibration

scholarly journals Spectral Calibration Requirements of Radio Interferometers for Epoch of Reionisation Science with the SKA

2016 ◽  
Vol 33 ◽  
Author(s):  
Cathryn M. Trott ◽  
Randall B. Wayth
Keyword(s):  
Thermal Noise ◽  
Spectral Response ◽  
Order Term ◽  
Spectral Characteristics ◽  
Primary Beam ◽  
Noise Power ◽  
Science Data ◽  
Spectral Calibration ◽  
Fourth Order Term ◽  
Complete Frequency

AbstractSpectral features introduced by instrumental chromaticity of radio interferometers have the potential to negatively impact the ability to perform Epoch of Reionisation and Cosmic Dawn (EoR/CD) science. We describe instrument calibration choices that influence the spectral characteristics of the science data, and assess their impact on EoR/CD statistical and tomographic experiments. Principally, we consider the intrinsic spectral response of the antennas, embedded within a complete frequency-dependent primary beam response, and instrument sampling. The analysis is applied to the proposed SKA1-Low EoR/CD experiments. We provide tolerances on the smoothness of the SKA station primary beam bandpass, to meet the scientific goals of statistical and tomographic (imaging) of EoR/CD programs. Two calibration strategies are tested: (1) fitting of each fine channel independently, and (2) fitting of annth-order polynomial for each ~ 1 MHz coarse channel with (n+1)th-order residuals (n= 2, 3, 4). Strategy (1) leads to uncorrelated power in the 2D power spectrum proportional to the thermal noise power, thereby reducing the overall sensitivity. Strategy (2) leads to correlated residuals from the fitting, and residual signal power with (n+1)th-order curvature. For the residual power to be less than the thermal noise, the fractional amplitude of a fourth-order term in the bandpass across a single coarse channel must be < 2.5% (50 MHz), < 0.5% (150 MHz), < 0.8% (200 MHz). The tomographic experiment places constraints on phase residuals in the bandpass. We find that the root-mean-square variability over all stations of the change in phase across any fine channel (4.578 kHz) should not exceed 0.2 degrees.

scholarly journals Spectral calibration of atmosphere hyper-spectral resolution infrared sounder

2020 ◽  
Vol 41 (4) ◽  
pp. 723-729
Author(s):  
KE Junyu ◽  
◽  
WANG Dongjie ◽  
GUO Yongxiang ◽  
ZHANG Mengyu ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Spectral Calibration ◽  
Hyper Spectral

A new spectral calibration method for Fourier domain optical coherence tomography

Optik ◽  
2010 ◽  
Vol 121 (11) ◽  
pp. 965-970 ◽  
Author(s):  
Chao Ding ◽  
Peng Bu ◽  
Xiangzhao Wang ◽  
Osami Sasaki
Keyword(s):  
Optical Coherence Tomography ◽  
Calibration Method ◽  
Fourier Domain ◽  
Optical Coherence ◽  
Spectral Calibration

Online Spectral Calibration by Multiple Wavelengths for Echelle Spectrometer

2016 ◽  
Vol 36 (9) ◽  
pp. 0930001
Author(s):  
尹禄 Yin Lu ◽  
卢禹先 Lu Yuxian ◽  
巴音贺希格 Bayanheshig ◽  
杨晋 Yang Jin ◽  
崔继承 Cui Jicheng
Keyword(s):  
Spectral Calibration ◽  
Multiple Wavelengths ◽  
Echelle Spectrometer

Wavelength Misalignment Analysis and Spectral Calibration for Fourier Domain Polarization-Sensitive Optical Coherence Tomography

2018 ◽  
Vol 45 (2) ◽  
pp. 0207022
Author(s):  
陈艳 Chen Yan ◽  
李中梁 Li Zhongliang ◽  
南楠 Nan Nan ◽  
步扬 Bu Yang ◽  
卢宇 Lu Yu ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Fourier Domain ◽  
Optical Coherence ◽  
Spectral Calibration

A Spectral Calibration Method in Optical Coherence Tomography Based on Interference Signal with Fixed Optical Path Difference

2018 ◽  
Vol 45 (6) ◽  
pp. 0607005
Author(s):  
王瑄 Wang Xuan ◽  
李中梁 Li Zhongliang ◽  
南楠 Nan Nan ◽  
步扬 Bu Yang ◽  
曾爱军 Zeng Aijun ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Calibration Method ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Interference Signal ◽  
Optical Coherence ◽  
Spectral Calibration

Spectral Calibration of Imaging Spectrometer

2011 ◽  
Vol 28 (11) ◽  
pp. 48-51 ◽  
Author(s):  
裴 舒 PEI Shu
Keyword(s):  
Imaging Spectrometer ◽  
Spectral Calibration

Spectral calibration of Fengyun-3 satellite high-spectral resolution infrared sounder

2019 ◽  
Vol 27 (4) ◽  
pp. 747-755 ◽  
Author(s):  
漆成莉 QI Cheng-li ◽  
周 方 ZHOU Fang ◽  
吴春强 WU Chun-qiang ◽  
胡秀清 HU Xiu-qing ◽  
顾明剑 GU Ming-jian
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Spectral Calibration
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