Flight performance analysis of GRACE K-band ranging instrument with simulation data |
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| Institution: | 1. Korea Aerospace University, School of Aerospace and Mechanical Engineering, Goyang City 412-791, Republic of Korea;2. Korea Research Institute of Standards and Science, Division of Physical Metrology, Daejeon 305-340, Republic of Korea;1. National Time Service Center, Chinese Academy of Sciences, Shu Yuan Road, 710600 Xi’an, China;2. Key Laboratory of Precision Navigation Positioning and Timing Technology, Chinese Academy of Sciences, Shu Yuan Road, 710600 Xi’an, China;3. University of Chinese Academy of Sciences, Yu Quan Road, 100049 Beijing, China;1. Astronomical Institute, Czech Academy of Sciences, Fričova 298, 251 65 Ondřejov, Czech Republic;2. ESA/ESRIN, Via Galileo Galilei, 00044 Frascati, Italy;1. Department of Astrodynamics and Space Missions, Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS Delft, the Netherlands;2. Royal Netherlands Meteorological Institute, Utrechtseweg 297, 3731 GA De Bilt, the Netherlands |
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| Abstract: | A dual one-way ranging (DOWR) system provides very high accuracy range measurements between two satellites. The GRACE satellite mission implements the DOWR, called KBR (K-band ranging), to measure very small inter-satellite range change in order to map the Earth gravity field. The flight performance of the KBR is analyzed by using a hybrid software simulator that incorporates actual satellite orbit data into a comprehensive KBR simulator, which was earlier used for computing the GRACE baseline accuracy. Three types of experiments were performed. First is the comparison of the flight data with the simulated data in spectral domain. Second is the comparison of double differenced noise level. Third is the comparison of the range-rate difference with GPS clock estimates. The analysis shows a good agreement with the simulation model except some excessive high frequency noise, e.g. 10−4 m/√Hz at 0.1 Hz. The range-rate difference shows 0.003 cyc/s discrepancy with the clock estimates. These analyses are helpful to refine the DOWR simulation model and can be benefit to future DOWR instrument development. |
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