E-VLBI Progress in China
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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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e-VLBI Progress in ChinaZhang Xiuzhong, team of Chinese VLBI NetworkShanghai Astronomical ObservatoryChinese 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
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



2. e-VLBI Facility Development in China project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

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


Chinese VLBI Network project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

May 11, 2006

1993

1987

May 17, 2006

A New Correlator

2006


Specifications of chinese vlbi stations
Specifications of Chinese VLBI stations project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


天线 project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

Sheshan


NanShan project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


Miyun project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


Kunming project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


Data processing Center project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


The network connecting project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


New antenna servo system in seshan station
New Antenna servo system in Seshan station project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


New s x band cryogenic receivers in seshan station
New S/X band Cryogenic Receivers in Seshan Station project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


New S/X band Cryogenic Receivers in Nanshan Station project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


3. e-VLBI Observation experiments project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

  • 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


Spacecraft TT&C Signal Characteristics project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

  • 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 project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

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


SMART-1 tracking with 4 Chinese VLBI stations project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


SMART-1 tracking with 4 Chinese VLBI stations project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

RFI


SMART-1 tracking with 4 Chinese VLBI stations project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

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


zero-baseline test results project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


NUMBER MEAN (m) RMS (m) Baseline project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

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


Future Plans project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.

  • 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)


Thank you
Thank You ! project in China. There are problems to use current Chinese R & RR satellite tracking system to do lunar probe tracking.


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