JPNTI6 (JAPAN TIE 6) 2000 November 7 Notes prepared by Michiko Onogaki, Geographical Survey Institute Schedule name: JPNTI6.SKD on CDDISA Nominal Start: 05:00 U.T. on November 7 (day 312) first observation at 05:00 U.T. on 1749+096 Duration: 24 hours Nominal Stop: 05:00 U.T. on November 8 (day 313) last observation at 05:00 U.T. on 2234+282 Correlator: Koganei (CRL) Frequency Sequence: Modified S/X sequence based on CDP-SX narrow-band (360 MHz wide at X, 85 MHz wide at S) 1 letter 2 letter Station Code Code # of tapes # of obs Occupation Code Kashima26m Q KA 9 (K-4) 429 18567601 Kashima34m O KB 9 (K-4) 427 18575801 Tsukuba32m T Ts 9 (K-4) 429 73452301 Kashima11m R K1 9 (K-4) 429 Koganei11m G Kg 9 (K-4) 429 Miura-1m B Mu 9 (K-4) 429 Tateyam-11m Y Ty 9 (K-4) 428 Purpose ======= Kashima VLBI station (26m antenna) has been the reference of geodetic VLBI experiments in Japan. However, Kashima26m is so old that its performance is not so high in the world VLBI standard, so the GSI established Tsukuba VLBI station (32m antenna) in 1998. The domestic VLBI tie experiment (Japan-tie) is intended to perform a highly precise tie among the large antennas, Tsukuba32m, Kashima26m and Kashima34m. The purpose of the JPNTI sessions is to transfer the valuable result of log period by Kashima26m and Kashima34m to Tsukuba-32m. Four KSP stations also participate in this experiment. Schedule ======== This is a new schedule generated by M. Onogaki with the automatic mode of sked. The following are the characteristics of the schedule: 1) This schedule was optimized for sky coverage. 2) Only the observations in the previous 3 hours of the schedule were considered for the minor options. The best 20% of the configurations were considered for minor options. 3) The "minor options" were set to select observations to maximize the total number of observations and to minimize time between scans on the same source by thirty minutes. 4) In the baselines for three stations, Kashima26m, Kashima34m and Tsukuba32m, the minimum SNR limits were set to 20 for X-band and 15 for S-band. In the baselines of four KSP stations and three stations (Kashima26m, Kashima34m, Tsukuba32m), the minimum SNR limits were set to 15 for X-band and 15 for S-band. Since the baselines of KSP stations didn't take out fringe, the SNR limits were set to 0 for X-band and S-band. 5) Scan lengths were calculated based on the flux densities of observed sources and correlated amplitudes of sources to obtain SNR mentioned above. The scan lengths were then fixed in the schedule. This was necessary because the capability of the Koganei correlator to process different scan lengths has not been tested yet. Frequencies and Recording Mode ============================== Modified CDP-SX narrow-band sequence by shift with -1MHz for X-band and +2MHz for S-band is used, because the frequency spacing of the P-cal signals at KSP stations are currently 5MHz. The following frequency sequences are used in this experiment. For TSUKUB32, KASHIM34, KASHIM11, KOGANEI, MIURA and TATEYAMA Band Local Freq. VC# X 8209.99 1 X 8219.99 2 X 8249.99 3 X 8309.99 4 X 8419.99 5 X 8499.99 6 X 8549.99 7 X 8569.99 8 X 8229.99 9 X 8559.99 10 S 2219.99 11 S 2224.99 12 S 2239.99 13 S 2269.99 14 S 2294.99 15 S 2304.99 16 For KASHIMA26 Band Local Freq. VC# X 8209.99 1 X 8219.99 2 X 8249.99 3 X 8309.99 4 X 8419.99 5 X 8499.99 6 X 8549.99 7 X 8569.99 8 S 2219.99 9 S 2224.99 10 S 2219.99 11 S 2224.99 12 S 2239.99 13 S 2269.99 14 S 2294.99 15 S 2304.99 16 Ch.9 and Ch.10 are dummies. Kashima26m uses K-4 rack (Type1), so the frequency arrangement of Kashima26m differs from other stations. Antennas and Equipment ====================== Tsukuba32m uses K-4 rack (Type 2) and K-4 recorder (Type 2). Kashima26m uses the K-4 rack (Type 1) and K-4 recorder (Type 2). FS9 is used in each station for this experiment. Kashima-34m uses K-3 rack and K-4 recorder (Type 1). Field system developed by CRL originally is used on HP1000/A400. Four KSP stations use the K-4 rack (Type 2) and K-4 recorder (Type 2). Field system developed by CRL originally is used on NEC EWS4800 (Unix). The 10MHz frequency reference signal at Kashima34 station is shifted by +2x10^(-9) to introduce artificial fringe rate for the short baselines (Kashima34m-Kashima26m and Kashima34m-Kashima11m). In this experiment, the 10MHz reference signal at Kashima26m station is also shifted by -2x10^(-9), so the fringes of the short baseline(Kashima26m-Kashima11m) will also be found out. Correlation =========== This experiment will be correlated at the Koganei KSP Correlator with all baselines being correlated. SKED Summary from file jpnti6.skd for experiment JPNTI6 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx x x x x x x I 8 168 18.4 0048-097I x x x I 3 63 7.1 0059+581I x x x x x x x x x x x x x x I 14 294 15.6 0104-408I x x x x x I 5 105 23.2 0106+013I x x x x x x I 6 126 12.8 0119+115I x x x I 3 63 5.9 0119+041I x x x x xx x I 7 147 14.6 0208-512I I 0 0 .0 0229+131I xx x x x x I 6 126 11.6 0235+164I x x xx x x I 6 126 11.4 3C84 I x x x xx x x x x x x x x I 13 273 19.7 CTA26 I x x I 2 42 4.4 NRAO150 Ix x x x x x I 6 126 8.0 0402-362I x x x x I 4 84 15.2 0454-234I x x x x x xx x x I 9 183 24.7 0458-020I x xx x x x x x xx I 10 210 22.1 0530-727I I 0 0 .0 0528+134I x x x I 3 57 5.3 0537-441I x I 1 21 6.1 0552+398I x x I 2 42 3.1 0556+238I x x x I 3 63 5.3 0637-752I I 0 0 .0 0718+793I x x x x x x x x I 8 168 8.0 0727-115I x x x x x xx x I 8 168 19.3 0749+540Ix x x x x x x x x x x x x I 13 273 16.4 0804+499I x I 1 21 1.4 0805+410Ix x x xx x x x xx I 10 210 15.2 0823+033Ix x xx xx x xxx x x xI 13 273 27.3 OJ287 Ix x x x x xx x x x x xI 12 252 22.0 0919-260Ix xx x xx xx x xI 10 210 29.5 0920-397I x x x x xx I 6 126 26.9 4C39.25 Ix x x x I 4 84 6.2 OK290 I x x x x x I 5 105 8.8 0955+476I x x x x I 4 84 5.6 1034-293I I 0 0 .0 1044+719I x x x x x x x x x x x I 11 231 11.0 1053+815I x I 1 21 1.0 1057-797I I 0 0 .0 1104-445I I 0 0 .0 1124-186I x x I 2 42 5.3 1128+385Ix x x x x I 5 105 7.8 1144-379I I 0 0 .0 1219+044I x xxx x x xxI 8 168 16.6 3C273B I x x x xx x x I 7 147 14.8 1255-316I x xx x xx xxI 8 168 26.6 1300+580I I 0 0 .0 1308+326I x x xx x x x x x x xI 11 231 18.2 1313-333I I 0 0 .0 1334-127I x xx xx x x xxxI 10 210 24.5 1351-018I x x I 2 42 4.4 1357+769I x x x x x I 5 105 5.0 1424-418I x x x x xI 5 105 25.2 1451-375I I 0 0 .0 1606+106Ixx xx xx xx xx xx x xx I 15 315 29.6 1610-771I I 0 0 .0 1622-253I xxx xx xx x x xI 10 210 29.1 NRAO512 Ix x x I 3 63 4.6 3C345 I x xx x x xx x x x x x I 12 252 18.5 1726+455I I 0 0 .0 1739+522Ix x x x x x x x x x x x x x I 14 288 17.9 1741-038I x xx xx x xx x x xx xI 13 273 29.0 1749+096I x x x I 3 63 6.0 1815-553I I 0 0 .0 1908-201I x x x x I 4 84 10.8 1921-293I x x x x x I 5 105 15.8 1954-388I xx x x x x I 6 126 25.3 1958-179I x x x x xx I 6 126 15.7 2005-489I I 0 0 .0 2052-474I x I 1 21 12.8 2121+053I x x x xx x xx xx xx I 12 252 24.8 2128-123I x x x x I 4 84 9.8 2134+00 I x x x x I 4 84 8.6 2145+067I x I 1 21 2.0 2234+282I x x xx xx x x xx xx x x x I 15 315 25.8 3C454.3 I x x x x x x xx x x x I 12 252 22.8 2255-282I x x xx x x x x x I 9 189 27.7 Total scans, obs: 429 8991 Average number of obs. per baseline per source (normalized by up-time) = 13.3 Min = .0 Max = 30.3 (Baseline Kb-K1 on 0919-260) RMS = 9.3 Total time: 1442 minutes ( 24.0 hours). Key: Ka=KASHIMA Ts=TSUKUB32 Kb=KASHIM34 K1=KASHIM11 Kg=KOGANEI Mu=MIURA Ty=TATEYAMA Ka Ts Kb K1 Kg Mu Ty Avg % obs. time: 49 49 49 49 49 49 49 49 % cal. time: 4 4 4 4 4 4 4 4 % slew time: 39 16 39 10 10 10 10 19 % idle time: 6 29 6 35 35 35 35 26 # of tapes : 9.0 9.0 9.0 9.0 9.0 9.0 9.0 total # scans: 429 429 427 429 429 429 428 428 # scans/hour : 17 17 17 17 17 17 17 17.9 Avg scan (sec): 99 99 99 99 99 99 99 99 # OF OBSERVATIONS BY BASELINE | Ka Ts Kb K1 Kg Mu Ty StnTotal ------------------------------------------ Ka|429 429 427 429 429 429 428 2571 Ts| 429 427 429 429 429 428 2571 Kb| 427 427 427 427 426 2561 K1| 429 429 429 428 2571 Kg| 429 429 428 2571 Mu| 429 428 2571 Ty| 428 2566 Number of 2-station scans: 0 Number of 3-station scans: 0 Number of 4-station scans: 0 Number of 5-station scans: 0 Number of 6-station scans: 3 Number of 7-station scans: 426 Total # of scans, observations: 429 8991 Average baseline components for all observations Average XY = 67. Average XZ = 58. Average YZ = 76. Average length = 84.