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e-VLBI Progress in China Zhang Xiuzhong, team of Chinese VLBI Network Shanghai Astronomical Observatory Chinese Academy of Sciences. Outline. Introduction e-VLBI Facility Development in China some e-VLBI Observation results Future Plan for e-VLBI in China. 1. Introduction.

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Outline

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  1. e-VLBI Progress in ChinaZhang Xiuzhong, team of Chinese VLBI NetworkShanghai Astronomical ObservatoryChinese Academy of Sciences

  2. Outline • Introduction • e-VLBI Facility Development in China • some e-VLBI Observation results • Future Plan for e-VLBI in China

  3. 1. Introduction • science Year 1970, we started to study and try to develop the VLBI technologies in China; • in Year 1987, 25 m telescope in Sheshan Station • in Year 1994, 25 m telescope in Nanshan Station • a 3m Mobile VLBI station is available in 1999 • First fringe of 2 station FX correlator in 2000

  4. in Year 2001, started to discuss about lunar prospect project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking. • a good opportunity for Chinese astronomer to use VLBI system to do lunar probe tracking

  5. 2. e-VLBI Facility Development in China With Chinese Lunar Project, we have a chance to upgrade our VLBI system: two new telescopes ( 50m and 40m ) improve the station instruments create a data processing center (include hardware and software correlator) the network for e-VLBI

  6. Chinese VLBI Network May 11, 2006 1993 1987 May 17, 2006 A New Correlator 2006

  7. Specifications of Chinese VLBI stations

  8. 天线 Sheshan

  9. NanShan

  10. Miyun

  11. Kunming

  12. Data processing Center

  13. The network connecting

  14. New Antenna servo system in Seshan station

  15. New S/X band Cryogenic Receivers in Seshan Station

  16. New S/X band Cryogenic Receivers in Nanshan Station

  17. 3. e-VLBI Observation experiments • Narrow band real time test observation with different spacecraft. • Different orbit spacecraft have been observed with VLBI system. i.e. GEO, TC-1, TC-2, SMART-1, deep space probe

  18. Spacecraft TT&C Signal Characteristics • Narrow bandwidth several hundred KHz • Relative strong signal to noise rate • Special signal spectrum with special structure • The dynamic range of signal amplitude relative large

  19. SMART-1 tracking with 4 Chinese VLBI stations 16Mbps in real time mode, 256Mbps in non real time mode. The result delay time: 1.5 – 2 minutes after observe time for 1 min. data

  20. SMART-1 tracking with 4 Chinese VLBI stations

  21. SMART-1 tracking with 4 Chinese VLBI stations RFI

  22. SMART-1 tracking with 4 Chinese VLBI stations residual delay residual delay rate The residual delay and delay rate, compare with ESA reconstructed orbit. black for the results with hardware correlator and red for software correlator

  23. zero-baseline test results

  24. NUMBER MEAN (m) RMS (m) Baseline 6462 0.0011/3.04051.9539/3.6147 SH－BJ 5502 -0.6249/0.94651.6972/1.8163 SH－KM 5329 -0.7947/-2.55481.6538/2.9382 SH－UR 5858 0.1180/-1.89501.4796/2.3543 BJ－KM 5669 -0.0973/-5.21851.5870/5.4488 BJ－UR 5813 -0.2839/-3.49171.0780/3.6433 KM－UR Red: new results Green:old results

  25. Future Plans • Make system calibrate for our VLBI stations • upgrade our network system, depend on the requirement of astronomy, geodesy and spacecraft tracking • Prepare to do the near real time orbit tracking of CE-1 (Chinese lunar project, will be launched in 2007)

  26. Thank You !

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