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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-177
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-177
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 06 May 2019

Submitted as: research article | 06 May 2019

Review status
This discussion paper is a preprint. A revision of the manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT).

On Study of Two-Dimensional Lunar Scan for Advanced Technology Microwave Sounder Geometric Calibration

Jun Zhou and Hu Yang Jun Zhou and Hu Yang
  • Earth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, MD, 20740, USA

Abstract. The NOAA-20 satellite was successfully launched on 18 November 2017. It carries five key instruments including Advanced Technology Microwave Sounder (ATMS). On January 31, 2018, the spacecraft performed a pitch-over maneuver operation, during which the two-dimensional lunar scan observations were collected. In this study, a technique has been developed by which the ATMS on-orbit geometric calibration accuracy can be validated based on this lunar scan dataset. The fully calibrated data are fitted in the antenna pattern coordinate by Gaussian function. The deviation of the center of the fit function from the origin of the frame is taken to be the boresight pointing error of the instrument. This deviation is further transformed to the Euler angle roll and pitch defined in spacecraft coordinate system. The estimated ATMS boresight pointing Euler angle roll (pitch) is 0.05°, (0.22°) at K-band, −0.07°, (0.25°) at Ka-band, 0.02°, (0.24°) at V-band, −0.07°, (−0.08°) at W-band, and −0.04°, (0.02°) at G-band. The results are validated by comparing with those derived from the coastline inflection point method. It shows that the Euler angles derived from these two independent methods are consistent very well. For the sounding channels where the coastline method is inapplicable, the lunar scan method is still capable of delivering reasonable estimations of their geometric calibration errors.

Jun Zhou and Hu Yang
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Status: final response (author comments only)
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Jun Zhou and Hu Yang
Jun Zhou and Hu Yang
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Latest update: 17 Aug 2019
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Short summary
Evaluating the on-orbit geolocation accuracy of ATMS is of great importance. The widely used earth-target dependent methods are crippled by the strong atmospheric absorption at sounding channels and cloud contamination at window channels. To solve these issues, this study developed a geolocation evaluation algorithm based on a unique 2D lunar scan dataset captured by ATMS during NOAA-20 pitch-over maneuver operation. The results are validated by the coastline inflection point method.
Evaluating the on-orbit geolocation accuracy of ATMS is of great importance. The widely used...
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