1. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop1 A few Astronomical Observations of CVN Wang Weihua Shanghai Astronomical Observatory

2. 2009 East Asia VLBI Workshop2 Contents 一． The observation and data processing of CVN 二． The results of two astronomical observations 三． The problems and the discussion about the CVN 四． The design of CVN VLBI database

3. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop3 2460 2158 3249 1114 2476 1920 1.1 CVN structure

4. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop4 1.2 Frequencies available with the CVN telescopeWaveband SHL,C,S,X,K BJS,X KMS,X URL,C,S,X,K Note SH and UR have been building for about 20 years BJ and KM were build on 2006 for Chang’E project; So Only S/X band receiver Must nearly real-time Must be reliable.

5. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop5 1.3 UV coverage The UV coverage of the CVN at 18 cm for W3OH

6. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop6 1.4 VLBI stations The FS system; Mark5A, Mark5B ； K5 (Sh and Ur); SKD,VEX; Mark5,Log, RXG

7. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop7 1.5 the correlators  Mark5A, Mark5B ；  Job file

8. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop8 1.6 MakeFITS  Schedule file;  Eop file ；  Uvw (calc9);  Log,rxg  A Fits-idi file once a scan;

9. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop9 2.1.1 UV coverage

10. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop10 2.1.2 the VLBI image of 3c84

11. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop11 2.2 TY (cg002)

12. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop12 Before fringe fitting

13. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop13 After fringe fitting

14. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop14 3.1 station positions  The accuracy of telescop positions (BJ, KM) < 5cm  Need more geodetic observations  Dr Wang Guangli X(m)Y(m)Z(m)SX(m)SY(m)SZ(m) BJ-2201304.5904324789.0954125367.8130.0060.0100.011 KM-1281152.6285640864.3912682653.5260.0010.0070.004 UR 228310.7054631922.8124367064.0250.0070.0110.013

15. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop15 3.2 system parameters of new telescopes  Noise source ；  Gain curve;  control system of Kunming  Prof Xu Zhuhe

16. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop16 3.3 The correlator  Correlate the data for a scan ；  polariation VLBI observations;  Pulsar gating  Dr Zheng Weimin

17. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop17 3.4 ?  CVN programme committee.  Whom to submit a proposal?  EAVN programme committee for EAVN.

18. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop18 4.1 The CVN VLBI database  submit the notices and meeting  Upload News, picture and lecture;  submit the proposal and the schedule file ；  Upload log file and the status of the correlator  Manage the VLBI data;  CVN Data Archive  Linux + Apache + PHP + mySQL  Tsinghua University and SHAO

19. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop19 4.2 Design of CVN VLBI Database UserIDGroupIDuserNameinstituteaddress,email,… 1 User and Group GroupIDgroupNameprivilege

20. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop20 4.2 Design of CVN VLBI Database newsUDuserIDtitletimecontent,file,… 2 Upload news and lectures lectIDuserIDtitletimeContent, file, …

21. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop21 4.2 Design of CVN VLBI Database noteIDuserIDtitletimecontent,file,… 3 Upload notice,meeting meetIDuserIDtitletimeContent, file, …

22. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop22 4.2 Design of CVN VLBI Database propIDuserIDtitleobscodefile,… 4 submit a proposal and the schedule file obscodeuserIDSched filetime …

23. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop23 4.2 Design of CVN VLBI Database logIDobscodestationID userIDTime,Log files … 5 upload log files of station and status of correlator corrIDobscodeuserIDtimeprocessing file …

24. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop24 4.2 Design of CVN VLBI Database fitsfileobscodepiNamestationsfreq,obsTime,FITS Files 6 manage the result 7 download the archive data using ftp

25. Shanghai Astronomical Observatory 2009 East Asia VLBI Workshop25 Thank you!