On Study of Error Sources in Microwave Thermal Vacuum Non-Linearity Test and on-Orbit Verification

Yang, Hu; Sun, Ninghai; Liu, Quanhua; Leslie, R. Vincent; Kim, Edward; Lyu, Cheng-Hsuan; Sammons, Matthew; Feuntes, James

doi:10.1109/IGARSS39084.2020.9324629

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On Study of Error Sources in Microwave Thermal Vacuum Non-Linearity Test and on-Orbit Verification

2020
By Yang, Hu ; Sun, Ninghai ; Liu, Quanhua ; ...
Source: IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020, pp. 6449-6452

[PDF-690.98 KB]

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Journal Title:

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium
Personal Author:

Yang, Hu ; Sun, Ninghai ; Liu, Quanhua ; Leslie, R. Vincent ; Kim, Edward ; ... More +

Yang, Hu ; Sun, Ninghai ; Liu, Quanhua ; Leslie, R. Vincent ; Kim, Edward ; Lyu, Cheng-Hsuan ; Sammons, Matthew ; Feuntes, James Less -
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; STAR (Center for Satellite Applications and Research) ; CISESS (Cooperative Institute for Satellite Earth System Studies)

NESDIS (National Environmental Satellite, Data, and Information Service) ; STAR (Center for Satellite Applications and Research) ; CISESS (Cooperative Institute for Satellite Earth System Studies) Less -
Description:

For the on-orbit calibration of passive microwave radiometers, instrument non-linearity is a major error source, causing a scene-temperature-dependent error if not being properly corrected. non-linearity results from the intrinsic feature of the square-law detector and amplifiers used in total-power microwave radiometers, and can only be accurately characterized through the ground-based Thermal Vacuum Test (TVAC). The ground-based non-linearity characterization is then used in the calibration algorithm to attempt to remove this error source. Evaluation results for current operational microwave-sounding instruments show that the magnitude of the non-linearity error varies from channel to channel and from instrument to instrument, with maximum changes of several tenths of kelvins to several kelvins. While the different responses of the detector and amplifier may explain the non-linearity differences in different instruments, errors in TVAC tests could also increase the uncertainty in the non-linearity assessment. Therefore, accurate knowledge of error sources in the TVAC test and their corrections are important for a reliable and accurate non-linearity measurement. In this paper, major error sources in the TVAC test are studied and identified for the NOAA-20 Advanced Technology Microwave Sounder. Correction methods are developed by combining the pre-launch TVAC test and post-launch deep-space-scan test data sets. An on-orbit evaluation method is also proposed to validate the ground-measured instrument non-linearity.
Keywords:

[+]

Calibration Radiometers NOAA-20 ATMS Non-linearity On-orbit Evaluation Thermal Vacuum Test (TVAC) TVAC Error Source
Source:

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020, pp. 6449-6452
DOI:

https://doi.org/10.1109/IGARSS39084.2020.9324629
Document Type:

Journal Article
Funding:

Grant no. NA14NES4320003 ; Grant no. NA19NES4320002

Grant no. NA14NES4320003 ; Grant no. NA19NES4320002 Less -
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Accepted Manuscript
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Submitted
Main Document Checksum:

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urn:sha256:a807e3a6fb96b643edbf414d99ed41bb62bcbae8c2fb544b606456814f4f2970
Download URL:

https://repository.library.noaa.gov/view/noaa/47416/noaa_47416_DS1.pdf
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On Study of Error Sources in Microwave Thermal Vacuum Non-Linearity Test and on-Orbit Verification

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