대한원격탐사학회지 (Korean Journal of Remote Sensing)

  • 제31권4호
  • /
  • Pages.353-360
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  • 2015
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  • 1225-6161(pISSN)
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  • 2287-9307(eISSN)
대한원격탐사학회 (Korean Society of Remote Sensing)
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Improvement of Earth Gravity Field Maps after Pre-processing Upgrade of the GRACE Satellite's Star Trackers

  • Ko, Ung-Dai (Agency for Defense Development) ;
  • Wang, Furun (Center for Space Research) ;
  • Eanes, Richard J. (Center for Space Research)
  • 투고 : 2015.06.18
  • 심사 : 2015.08.25
  • 발행 : 2015.08.31
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초록

Earth's gravity field recovery was improved after the pre-processing upgrade of the Gravity Recovery And Climate Experiments (GRACE) satellite's star trackers. The star tracker measurements were filtered with a tighter low-pass filtering of 0.025Hz cutoff frequency, instead of a nominal filtering of 0.1Hz cutoff frequency. In addition, a jump removal algorithm was applied to remove discontinuities, due to direct Sun and/or Moon interventions, in the star tracker measurements. During the K-Band Ranging (KBR) calibration maneuvers, large attitude variations could be detected concurrently by both of the star trackers and the accelerometer. The misalignment angles of star trackers between the true frame and the normal frame could be determined by comparing measurements from these sensors. In this paper, new Earth' gravity field maps were obtained using above improvement. Based on comparisons to nominal Earth's gravity field maps, the new Earth's gravity field maps were found better than the nominal ones. Among the applied methods, the misalignment calibration of the star trackers had a major impact on the improvement of the new Earth's gravity field maps.

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참고문헌

  1. Bandikova, T. and J. Flury, 2014. Improvement of the GRACE star tracker data based on the revision of the combination method, Advances in Space Research, 54(9): 1818-1827. https://doi.org/10.1016/j.asr.2014.07.004
  2. GRACE Team, 1998. GRACE Science and Mission Requirements Document (SMRD), GRACE 327-200, JPL D-15928.
  3. Kim, J., 2000. Simulation Study of a Low-Low Satelliteto-Satellite Tracking Mission, Ph.D. thesis, Department of Aerospace Engineering and Engineering Mechanics, the University of Texas at Austin.
  4. Ko, U., B. Tapley, J. Ries, and S. Bettadpur, 2012. High-Frequency Noise in the Gravity Recovery and Climate Experiment Intersatellite Ranging System, Journal of Spacecraft and Rockets, 49(6): 1163-1173. https://doi.org/10.2514/1.A32141
  5. MacArthur, J.L. and A.S. Posner, 1985. Satellite-to-Satellite Range-Rate Measurement, IEEE Transactions on Geoscience and Remote Sensing, GE-23(4): 517-523. https://doi.org/10.1109/TGRS.1985.289443
  6. Rosborough, G.W., 1986. Satellite Orbit Perturbations due to the Geopotential, Ph.D. thesis, Center for Space Research, the University of Texas at Austin, Mail Code R1000, 78712.
  7. Swenson, S. and J. Wahr, 2006. Post processing removal of correlated errors in GRACE data, Geophysical Research Letters, vol. 33, L08402.
  8. Tapley, B.D., S. Bettadpur, M. Watkins, and C. Reigber, 2004. The Gravity Recovery and Climate Experiment: Mission overview and early results, Geophys. Res. Lett., 31, L09607. DOI: 0.1029/2004GL019920.
  9. Tapley, B., J. Ries, S. Bettadpur, D. Chambers, M. Cheng, F. Condi, and S. Poole, 2007. The GGM03 Mean Earth Gravity Model from GRACE, American Geophysical Union, Fall Meeting 2007.
  10. Thomas, J.B., 1999. An Analysis of Gravity-Field Estimation Based on Intersatellite Dual-1-Way Biased Ranging, JPL Publication 98-15, Jet Propulsion Laboratory, Pasadena, California.
  11. Wang, F., 2003. Study on Center of Mass Calibration and K-band Ranging System Calibration of the GRACE Mission, Ph.D. thesis, Department of Aerospace Engineering and Engineering Mechanics, the University of Texas at Austin.