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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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slide1
e-VLBI Progress in ChinaZhang Xiuzhong, team of Chinese VLBI NetworkShanghai Astronomical ObservatoryChinese Academy of Sciences
slide2

Outline

  • Introduction
  • e-VLBI Facility Development in China
  • some e-VLBI Observation results
  • Future Plan for e-VLBI in China
1 introduction
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
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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
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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

slide6

Chinese VLBI Network

May 11, 2006

1993

1987

May 17, 2006

A New Correlator

2006

slide8
天线

Sheshan

slide17

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
slide18

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
smart 1 tracking with 4 chinese vlbi stations
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

slide22

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

slide24

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

slide25

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)
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