High-accuracy same-beam VLBI observations using Shanghai and Urumqi telescopes


The same-beam VLBI observations of Rstar and Vstar, which were two small satellites of Japanese lunar mission, SELENE, were successfully performed by using Shanghai and Urumqi 25-m telescopes. When the separation angle between Rstar and Vstar was less than 0.1 deg, the differential phase delay of the X-band signals between Rstar and Vstar on Shanghai-Urumqi baseline was obtained with a very small error of 0.15 mm rms, which was reduced by 1–2 order compared with the former VLBI results. When the separation angle was less than 0.56 deg, the differential phase delay of the S-band signals was also obtained with a very small error of several mm rms. The orbit determination for Rstar and Vstar was performed, and the accuracy was improved to a level of several meters by using VLBI and Doppler data. The high-accuracy same-beam differential VLBI technique is very useful in orbit determination for a spacecraft, and will be used in orbit determination for Mars missions of China Yinghuo-1 and Russia Phobos-grunt.

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  1. 1

    Thornton C L, Border J S. Radiometric Tracking Techniques for Deep-Space Navigation. New Jersey: John Wiley & Sons, Inc., 2003

    Google Scholar 

  2. 2

    Iwata T, Takahashi M, Namiki N, et al. Mission instruments for lunar gravity field measurements using SELENE sub-satellites. J Geodetic Soc Jpn, 2001, 47: 558–563

    Google Scholar 

  3. 3

    Namiki N, Iwata T, Matsumoto K, et al. Far side gravity field of the Moon from four-way Doppler measurements of SELENE (Kaguya). Science, 2009, 323: 900–905

    Article  Google Scholar 

  4. 4

    Matsumoto K, Hanada H, Namiki N, et al. A simulation study for anticipated accuracy of lunar gravity field model by SELENE tracking data. Adv Space Res, 2008, 42: 331–336

    Article  ADS  Google Scholar 

  5. 5

    Kono Y, Hanada H, Ping J, et al. Precise positioning of spacecraft by multi-frequency VLBI. Earth Planets Space, 2003, 55: 581–589

    ADS  Google Scholar 

  6. 6

    Liu Q, Matsumoto K, Kikuchi F, et al. Same-Beam Differential VLBI Technology Using Two Satellites of the SELENE Spacecraft. IEICE-JB, 2006, J89B-B: 602–617

  7. 7

    Liu Q, Kikuchi F, Matsumoto K, et al. Error analysis of same-beam differential VLBI technique using two satellites of SELENE, JASR. Adv Space Res, 2007, 40: 51–57

    Article  ADS  Google Scholar 

  8. 8

    Kikuchi F, Liu Q, Matsumoto K, et al. Simulation analysis of differential phase delay estimation by same beam VLBI method. Earth Planets Space, 2008, 60: 391–406

    ADS  Google Scholar 

  9. 9

    Border J S, Folkner W M, Kahn R D, et al. Precise tracking of the Magellan and Pioneer Venus orbiters by same-beam interferometry, Part l: Data accuracy analysis. The Telecommunications and Data Acquisition Progress Report, 1992, 42–110: 1–20

    ADS  Google Scholar 

  10. 10

    Martín-Mur T, Antreasian P, Border J, et al. Use of very long baseline array in interferometric data for spacecraft navigation. International Symposium on Space Technology and Science. d-50, 2006

  11. 11

    Liu Q, Kikuchi F, Tsuruta S, et al. Effects of phase characteristics of telescopes on same-beam differential VLBI. IEEE Trans Antenna Prop, 2007, 55: 1466–1470

    Article  ADS  Google Scholar 

  12. 12

    Kikuchi F, Kono Y, Yoshikawa M, et al. VLBI observations of narrow bandwidth signals from the spacecraft. Earth Planets Space, 2004, 56: 1041–1047

    ADS  Google Scholar 

  13. 13

    Liu Q, Tsuruta S, Asari K, et al. New method of measuring phase characteristics of antenna using Doppler frequency measurement technique. IEEE Trans Antenna Prop, 2004, 52: 3312–3318

    Article  ADS  Google Scholar 

  14. 14

    Liu Q, Nishio M, Yamamura K, et al. Statistical characteristics of atmospheric phase fluctuations observed by a VLBI system using a beacon wave from a geostationary satellite. IEEE Trans Antenna Prop, 2005, 53(4): 1519–1527

    Article  ADS  Google Scholar 

  15. 15

    Takasu T, Kasai S. Development of precise orbit/clock determination software for GPS/GNSS. The 49th Space Sciences and Technology Conference, Hiroshima, Japan, 2005

  16. 16

    Beutler G, Rothacher M, Schaer S, et al. The international GPS Service (IGS), an interdisciplinary service in support of Earth sciences. Adv Space Res, 1999, 23(4): 631–653

    Article  ADS  Google Scholar 

  17. 17

    Niell A E. Global mapping functions for the atmosphere delay at radio wavelengths. J Geophys Res, 1996, 101-B2: 3227–3246

    Article  Google Scholar 

  18. 18

    Schaer S, Beutler G, Mervart L, et al. Global and regional ionosphere models using the GPS double difference phase observable. Proceedings of the IGS Workshop on Special Topics on New Directions, Potsdam, Germany. 1995, 77–92

  19. 19

    Ping J, Kono Y, Matsumoto K, et al. Regional ionosphere map over Japanese islands. Earth Planets Space, 2002, 54: e13–e16

    ADS  Google Scholar 

  20. 20

    Pavlis D, Poulouse S, McCarthy J J. GEODYN II system description. Contractor report, SGT Inc., Greenbelt, MD, 2006. 1–5

    Google Scholar 

  21. 21

    Kikuchi F, Liu Q, Hanada H, et al. Pico-second accuracy VLBI of the two sub-satellites of SELENE (KAGUYA) using multi-frequency and same beam methods. Radio Sci, 2009, 44: 1–7

    Article  Google Scholar 

  22. 22

    Goossens S, Matsumoto K, Ishihara Y, et al. Results for orbit determination of the three satellites of Kaguya. J Geodetic Soc Jpn, 2009, 55: 255–268

    Google Scholar 

  23. 23

    Liu Q, Kikuchi F, Goossens S, et al. New method of differential VLBI observations in SELENE (Kaguya) and error analysis and correction for differential Phase delay. J Geodetic Soc Jpn, 2009, 55: 243–254

    Google Scholar 

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Corresponding author

Correspondence to QingHui Liu.

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Supported by the National Natural Science Foundation of China (Grant No. 10973031) and the CAS Key Research Program (Grant No. KJCX2-YW-T13-2)

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Liu, Q., Shi, X., Kikuchi, F. et al. High-accuracy same-beam VLBI observations using Shanghai and Urumqi telescopes. Sci. China Ser. G-Phys. Mech. Astron. 52, 1858–1866 (2009). https://doi.org/10.1007/s11433-009-0280-1

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  • same-beam
  • differential VLBI
  • phase delay
  • precise orbit determination