Dr. Xiaobo Xie Profile

Dr. Xiaobo Xie

Senior Technical Staff Member at Science Systems and Applications Inc

SPIE Involvement:

Author

Publications (10)

SPIE Journal Paper | 1 February 2008

Characterization of earthshine impacts on Moderate Resolution Imaging Spectroradiometer reflective solar bands calibration

Xiaobo Xie, Xiaoxiong Xiong

JARS, Vol. 2, Issue 01, 023507, (February 2008) https://doi.org/10.1117/12.10.1117/1.2898223

KEYWORDS: Calibration, MODIS, Contamination, Reflectivity, Sun, Sensors, Diffusers, Light scattering, Imaging systems, Mirrors

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Proceedings Article | 26 October 2007 Paper

An overview of Aqua MODIS after five-year on-orbit operation and calibration

W. Barnes, X. Xiong, B. Wenny, X. Xie, A. Wu, N. Che, J. Sun, V. Salomonson

Proceedings Volume 6744, 67441G (2007) https://doi.org/10.1117/12.736788

KEYWORDS: MODIS, Calibration, Sensors, Mirrors, Staring arrays, Long wavelength infrared, Diffusers, Black bodies, Infrared radiation, Reflectivity

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Proceedings Article | 26 September 2007 Paper

Characterization of MODIS solar diffuser on-orbit degradation

X. Xiong, X. Xie, A. Angal, J. Choi, J. Sun, W. Barnes

Proceedings Volume 6677, 66770O (2007) https://doi.org/10.1117/12.731304

KEYWORDS: MODIS, Calibration, Sensors, Diffusers, Sun, Reflectivity, Electronics, Radiometry, Ocean optics, Solids

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Proceedings Article | 3 October 2006 Paper

Four years of Aqua MODIS on-orbit radiometric calibration

W. Barnes, X. Xiong, X. Xie, A. Wu, K. Chiang, J. Sun, V. Salomonson, B. Guenther

Proceedings Volume 6361, 63610R (2006) https://doi.org/10.1117/12.687160

KEYWORDS: MODIS, Calibration, Sensors, Signal to noise ratio, Mirrors, Diffusers, Reflectivity, Space operations, Long wavelength infrared, Black bodies

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Proceedings Article | 7 September 2006 Paper

Improvement of MODIS RSB calibration by minimizing the Earthshine impact on solar diffuser observations

X. Xie, X. Xiong, R. Wolfe, A. Lyapustin

Proceedings Volume 6296, 629608 (2006) https://doi.org/10.1117/12.679081

KEYWORDS: Calibration, MODIS, Reflectivity, Contamination, Diffusers, Sensors, Earth's atmosphere, Atmospheric modeling, Sun, Spectral calibration

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Proceedings Article | 7 September 2006 Paper

Results and lessons from MODIS reflective solar bands calibration: pre-launch to on-orbit

X. Xiong, N. Che, C. Pan, X. Xie, J. Sun, W. Barnes, B. Guenther

Proceedings Volume 6296, 629607 (2006) https://doi.org/10.1117/12.679144

KEYWORDS: Calibration, MODIS, Sensors, Reflectivity, Diffusers, Signal to noise ratio, Electronics, Mirrors, Space operations, Staring arrays

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Proceedings Article | 21 October 2005 Paper

On-orbit performance of Aqua MODIS on-board calibrators

Xiaoxiong Xiong, William Barnes, Xiaobo Xie, Vincent Salomonson

Proceedings Volume 5978, 59780U (2005) https://doi.org/10.1117/12.627619

KEYWORDS: Calibration, MODIS, Sensors, Reflectivity, Diffusers, Mirrors, Black bodies, Lamps, Spectral calibration, Space operations

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Proceedings Article | 22 August 2005 Paper

Analysis of MODIS solar diffuser screen vignetting function

X. Xie, X. Xiong, D. Moyer, J. Sun, X. Liu, W. Barnes

Proceedings Volume 5882, 58820T (2005) https://doi.org/10.1117/12.615394

KEYWORDS: MODIS, Calibration, Diffusers, Vignetting, Sensors, Reflectivity, Space operations, Sun, Mirrors, Short wave infrared radiation

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Proceedings Article | 22 August 2005 Paper

Residual correlations in the solar diffuser measurements of the MODIS Aqua ocean color bands to the sun yaw angle

Gerhard Meister, Frederick Patt, Xiaoxiong Xiong, Junqiang Sun, Xiaobo Xie, Charles McClain

Proceedings Volume 5882, 58820V (2005) https://doi.org/10.1117/12.620094

KEYWORDS: Sensors, Calibration, MODIS, Diffusers, Sun, Solids, Biology, Imaging systems, Space operations, Reflectivity

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Proceedings Article | 22 August 2005 Paper

Performance of MODIS solar diffuser and solar diffuser stability monitor

X. Xiong, H. Erives, S. Xiong, X. Xie, J. Esposito, J. Sun, W. Barnes

Proceedings Volume 5882, 58820S (2005) https://doi.org/10.1117/12.615334

KEYWORDS: MODIS, Calibration, Sensors, Diffusers, Sun, Reflectivity, Near infrared, Radiometry, Mirrors, Imaging systems

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The Moderate Resolution Imaging Spectroradiometer (MODIS) reflective solar bands (RSB) cover wavelengths from 0.41 to 2.2μm. They are calibrated on-orbit by a solar diffuser (SD) panel, made of space-grade Spectralon. During each SD calibration a solar diffuser stability monitor (SDSM) is operated concurrently to track the changes of the SD bidirectional reflectance factor (BRF). The SDSM views alternately the sunlight (Sun View) through a fixed transmission screen and the sunlight diffusely reflected from the SD panel (SD view). A design error in the SDSM system, not discovered until post-launch, has caused significant ripples in the SDSM Sun view responses. Consequently an alternative normalization approach has been developed to remove the ripples in the SDSM Sun view responses and their impacts on the SD degradation analysis. This approach has been successfully used in the SDSM measurements on-orbit. In order to reduce the direct solar exposure onto the SD panel, the MODIS instrument was designed with a SD door that is normally commanded to an "open" position during SD/SDSM observations and to a "closed" position when the calibration is completed. For Terra MODIS launched in December 1999, an SD door related anomaly occurred in May 2003 that led to a decision to set the SD door permanently at the open position. This operational configuration has resulted in extra time of direct solar illumination on the SD plate and therefore a much faster SD degradation rate. In this paper we provide a brief description of the MODIS RSB calibration algorithm and the on-board SD and SDSM system used for the calibration. We examine the Terra MODIS SD degradation rate and its spectral dependency. The results from five years of SDSM observations are summarized in this paper and used to evaluate the SD on-orbit performance and its impact on the MODIS RSB calibration uncertainty. Prior to the SD door anomaly, the SD annual degradation rate was approximately 3% at 0.41μm, 2% at 0.47μm, and 1% at 0.53μm. After the SD door anomaly, the SD annual degradation rate has increased to 10% at 0.41μm, 7% at 0.47μm, and 4.5% at 0.53μm.

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