Geodetic VLBI Observations Using Giga-Bit VLBI System
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1 Geodetic VLBI Observations Using Giga-Bit VLBI System Y. Koyama 1, T. Kondo 1, J. Nakajima 1, M. Sekido 1, R. Ichikawa 1, E. Kawai 1, H. Okubo 1, H. Osaki 1, H. Takaba 2, M. Yoshida 2, and K. Wakamatsu 2 1. Kashima Space Research Center, CRL 2. Gifu University 22 Feb., 2000 IVS General Meeting
2 Giga Bit VLBI System 1 Gbps (1024 Mbps) VLBI System Developed by CRL Single channel with 1 bit/sample system (0-512MHz) Sampler Modified Digital Oscilloscope (Tektronix TDS784/TDS580) Use 1 bit output from 4 bit/sample Data Recorder Modified HDTV Digital Recorder (Toshiba GBR1000) Recording Speed : 984 Mbps 1024 Mbps D6 standard (cf. D1 standard is used by K-4 systems) 61 minutes recording with a L-size cassette tape (364x205x32mm) 22 Feb., 2000 IVS General Meeting
3 Giga Bit VLBI System Correlator (GICO/UWBC) Originally developed by NAOJ for connected mm-array at Nobeyama (NMA) 1 baseline / 2 Gbps correlation capability Lag window : 256 bits Interface Units DD-1 : extract 1 bit signal from 4 bits output of TDS784/TDS580 DRA1000 : Time-base control / Data formatting for recording Data synchronization for play-back DRA2000 : Delay tracking / 1 Gbit Buffer for e-vlbi 22 Feb., 2000 IVS General Meeting
4 Sampler Giga-bit VLBI System Correlator (GICO/UWBC) DD-1 DRA1000 DRA2000 Recorder 22 Feb., 2000 IVS General Meeting
5 Giga-bit VLBI System The 1st-ever 1-Gbit finge of quasar 3C345 Research and development plan 1999 Performance and reliability evaluation test 2000 Initial geodetic VLBI observation 2001 Multiple baseline enhancement 2002 Scientific data reduction VLBI-GICO 1G-bit corr. Former narrow band allocation 22:30:55 Giga-bit wide-band acquisition frequency 22:30:55 VLBI recorder interface VLBI correlator interface Analysis software VLBI sampler interface VLBI recorder interface VLBI recorder interface VLBI correlator interface High-speed sampler High-speed recorder Digital Processor Observation system Data correlation system 22 Feb., 2000 IVS General Meeting
6 The First Fringe Observation Antenna Frequency : July 10, 1998 : Koganei(11m) - Kashima(11m) : 2 GHz and 8 GHz (alternative) 3C Feb., 2000 IVS General Meeting
7 High-Sensitivity Observation Purposes Compare total flux and correlated flux Measure brightness temperature Source Selection High Red Shift QSO z> sources Total flux Antenna NOBEYAMA (45m) Kashima (34m) Frequency 22GHz Nobeyama 45m Kashima 34m First observations on December 25, 1999 Fringes from more than 50 QSOs identified! 22 Feb., 2000 IVS General Meeting
8 ftp-vlbi for near-realtime fringe detection Source Integration Time : 3C279 : 0.1 sec Nobeyama 45m Kashima 34m 22 Feb., 2000 IVS General Meeting
9 Geodetic VLBI with GBR System High Sensitivity Smaller Antenna More observations in a given time period Single Channel VLBI Frequency bandwidth = consecutive 512 MHz No base-band converters No phase calibration tones 22 Feb., 2000 IVS General Meeting
10 3m antenna system Developed in 1987 Transportable Transported to Koganei, Daito, Wakkanai, and Okinawa Diameter : 3m Frequency X-Low : MHz X-High : MHz Efficiency : 37% System Noise Temperature : 120K Slewing Speed : 3 deg./sec. 22 Feb., 2000 IVS General Meeting
11 Experiments October 19, hours KASHIM11-KOGANEI (11m) Baseline Length = km to develop softwares after correlation processing Gifu Univ. Kashima Koganei Miura Tateyama January 18, 2000 (GIFT-1) 25.5 hours KASHIM34 (34m) - GIFUUNIV (3m) Baseline Length = km the first full-day geodetic VLBI experiment February 29, 2000 (GIFT-2) 22 Feb., 2000 IVS General Meeting
12 October 19, hours test observations with KSP facilities : comparisons with KSP results RF : MHz IF ( MHz) was converted to baseband (0-500MHz) by a hybrid mixer and 500MHz CW signal from a synthesizer KASHIM11 (11m) Preliminary Comparison K-4 (KSP) GBR RMS Delay 48 ps 183 ps Baseline Length ± 3.69 mm ± mm KOGANEI (11m) 22 Feb., 2000 IVS General Meeting
13 January 18, 2000 (GIFT-1) KASHIM34 (34m) The first full day geodetic VLBI RF : MHz Higher frequency of the IF ( MHz) was cut by a low-pass filter (Lc=500MHz) 64 Mbps (K-4) observations for comparison GPS observations in parallel GIFUUNIV (3m) 22 Feb., 2000 IVS General Meeting
14 Future Plan Data processing of the GIFT-1 in progress Further improvements required to improve the delay determination from the Giga-Bit VLBI system GIFT-2 is currently scheduled on February 29, 2000 Multi-channel VLBI observations ex. Filter bank and over-sampling method Another Giga-Bit VLBI System (D1 based) will be developed under the VERA Project (NAOJ) Compatibility test will be performed using the VLBI Standard Interface (VSI) 22 Feb., 2000 IVS General Meeting
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