Volume 33 Issue 3
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Article Navigation >  Chinese Journal of Space Science  > 2013  >  33(3): 302-307
Chen Li, Wang Yueke, Yang Jun, Zhang Chuansheng. Autonomous Time-tag Error Measurement Applying Two Way Time Transfer for Earth Gravity Satellites[J]. Chinese Journal of Space Science, 2013, 33(3): 302-307. doi: 10.11728/cjss2013.03.302
Citation: Chen Li, Wang Yueke, Yang Jun, Zhang Chuansheng. Autonomous Time-tag Error Measurement Applying Two Way Time Transfer for Earth Gravity Satellites[J]. Chinese Journal of Space Science, 2013, 33(3): 302-307. doi: 10.11728/cjss2013.03.302
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Autonomous Time-tag Error Measurement Applying Two Way Time Transfer for Earth Gravity Satellites

doi: 10.11728/cjss2013.03.302 cstr: 32142.14.cjss2013.03.302

  • College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073

  • Received Date: 2012-07-06
  • Rev Recd Date: 2013-03-18
  • Publish Date: 2013-05-15
    Abstract
  • Autonomous time-tag error measurement is of importance for development of Chinese Earth gravity satellites. In this paper, Two Way Time Transfer (TWTT) method is introduced for the autonomous time-tag error measurement of gravity satellites. A measurement scenario is presented, and a model which includes satellite-motion-induced path asymmetry, ionosphere effect, instrument delay, and random time measurement error is built. Combining the characteristics of Earth gravity satellites adopting TWTT, the influences of above mentioned error sources are analyzed and the relevant correction methods are proposed. Take GRACE (Gravity Recovery And Climate Experiment) system for example, based on the TWTT method with correction means, the achieved measurement precision of autonomous time-tag error can be better than 0.62ns, most of which is induced by the calibration error of instrument delay and the random time measurement error.

     

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