JPNTI4 (JAPAN TIE 4) 2000 September 12 Notes prepared by Michiko Onogaki, Geographical Survey Institute Schedule name: JPNTI4.SKD on CDDISA Nominal Start: 05:00 U.T. on September 12 (day 256) first observation at 05:00 U.T. on 3C345 Duration: 24 hours Nominal Stop: 05:00 U.T. on September 13 (day 257) last observation at 04:59 U.T. on 1741-038 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 Kashima-26m Q KA 5 (K-4) 357 18567601 Kashima-34m O KB 5 (K-4) 355 18575801 Tsukuba-32m T Ts 5 (K-4) 357 73452301 Kashima-11m R K1 5 (K-4) 357 Koganei-11m G Kg 5 (K-4) 357 Miura-11m B Mu 5 (K-4) 357 Tateyama-11m Y Ty 5 (K-4) 357 Purpose ======= Kashima VLBI station (26m antenna) has been the reference of geodetic VLBI experiments in Japan. However, Kashima-26m 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, Tsukuba-32m, Kashima-26m and Kashima-34m. The purpose of the JPNTI sessions is to transfer the valuable result of log period by Kashima-26m and Kashima-34m 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, Kashima-26m, Kashima-34m and Tsukuba, 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 (Kashima-26m, Kashima-34m, Tsukuba-32m), 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. Frequency Sequence =================== 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. Ch.1 to Ch.8 is for X-band, and Ch.11 to Ch.16 is for S-band. The following frequency sequences are used in this experiment. Ch.9 and Ch.10 are dummies. For KASHIMA, TSUKUB32 and KASHIM34 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 For 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 8549.99 9 X 8569.99 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 Antennas and Equipment ====================== Tsukuba-32m uses K-4 rack (Type 2) and K-4 recorder (Type 2). Kashima-26m 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). Correlation =========== This experiment will be correlated at the Koganei KSP Correlator with all baselines being correlated. SKED Summary from file jpnti4.skd for experiment JPNTI4 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x xx x I 4 84 9.2 0048-097I x x x x x x I 6 126 14.2 0059+581I x x x x x x x I 7 147 7.8 0104-408I x x x x x I 5 99 21.8 0106+013I xx x x x x I 6 126 12.8 0119+115I x I 1 21 2.0 0119+041I xx x x x x I 6 126 12.5 0208-512I I 0 0 .0 0229+131I xx x x x I 5 105 9.7 0235+164I x x x x x x x xI 8 168 15.1 3C84 I x x x x x x x x x x x x xI 13 273 19.7 CTA26 I I 0 0 .0 NRAO150 I x x x x x I 5 105 6.7 0402-362I x I 1 21 3.8 0454-234I x xx x x x x x I 8 168 22.5 0458-020Ixx x x xx x x xx xI 11 231 24.1 0528+134Ix x I 2 42 3.9 0537-441I x x x I 3 63 18.3 0552+398I x x I 2 42 3.1 0556+238I I 0 0 .0 0637-752I I 0 0 .0 0718+793I x x x x x I 5 105 5.0 0727-115I x x x x x xI 6 126 14.5 0749+540I x x x x x x x x x x x x x I 13 273 16.4 0804+499I I 0 0 .0 0805+410I x x x x x x x x x I 9 189 13.7 0823+033I x x x x x x x x x xI 10 210 21.0 OJ287 I x xx x xx x xx x x x x xI 14 294 25.6 0919-260I x xx x x x x x xI 9 189 26.6 0920-397I x x x x xI 5 105 22.2 4C39.25 I xx x x I 4 84 6.2 OK290 I x x I 2 42 3.5 0955+476I I 0 0 .0 1034-293I I 0 0 .0 1044+719I x x x x x x x x I 8 168 8.0 1053+815I I 0 0 .0 1057-797I I 0 0 .0 1104-445I I 0 0 .0 1124-186I x x x I 3 63 7.9 1128+385I x I 1 21 1.6 1144-379I I 0 0 .0 1219+044I I 0 0 .0 3C273B I x x xxx x x xx x x x xxI 14 294 29.6 1255-316I x x x xx x x I 7 147 23.5 1308+326Ix x x xx xx x x x x x I 12 252 19.8 1313-333I I 0 0 .0 1334-127Ixx x xx xx x x I 9 189 22.1 1351-018I x I 1 21 2.2 1357+769I x x x I 3 63 3.0 1424-418I xx x x x I 5 105 25.6 1451-375I I 0 0 .0 1606+106I x xx xxx xx xx x x xx I 14 294 27.8 1610-771I I 0 0 .0 1622-253I xx x xx xx x x I 9 189 26.4 NRAO512 I x xx x x x I 6 126 9.3 3C345 Ix x x x x x x x I 8 168 12.4 1726+455I I 0 0 .0 1739+522Ix x x x x x x x x x I 10 210 13.1 1741-038I xxxx x xx xx xx x x x I 14 294 31.4 1749+096I x I 1 21 2.0 1815-553I I 0 0 .0 1908-201I x x x x I 4 84 10.8 1921-293I x x x x I 4 84 12.6 1954-388I x x x x x I 5 99 19.9 1958-179I x x x I 3 63 7.8 2005-489I I 0 0 .0 2052-474I I 0 0 .0 2121+053I x x x x x x x I 7 147 14.5 2128-123I x x x x I 4 84 9.8 2134+00 I x x x x x x x I 7 147 15.1 2145+067I x I 1 21 2.0 2234+282I x x x x x x x x x x x I 11 231 18.9 3C454.3 I x x x x x xx x x I 9 189 17.1 2255-282I x x x x xx x I 7 147 21.5 Total scans, obs: 357 7485 Average number of obs. per baseline per source (normalized by up-time) = 11.4 Min = .0 Max = 31.9 (Baseline Kb-K1 on 1741-038) RMS = 9.3 Total time: 1441 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: 53 53 53 53 53 53 53 53 % cal. time: 4 4 4 4 4 4 4 4 % slew time: 36 14 38 9 9 9 10 18 % idle time: 6 27 4 32 32 32 32 23 # of tapes : 5.0 5.0 5.0 5.0 5.0 5.0 5.0 total # scans: 357 357 355 357 357 357 357 356 # scans/hour : 14 14 14 14 14 14 14 14.9 Avg scan (sec): 129 129 130 129 129 129 129 129 # OF OBSERVATIONS BY BASELINE | Ka Ts Kb K1 Kg Mu Ty StnTotal ------------------------------------------ Ka|357 357 355 357 357 357 357 2140 Ts| 357 355 357 357 357 357 2140 Kb| 355 355 355 355 355 2130 K1| 357 357 357 357 2140 Kg| 357 357 357 2140 Mu| 357 357 2140 Ty| 357 2140 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: 2 Number of 7-station scans: 355 Total # of scans, observations: 357 7485 Average baseline components for all observations Average XY = 67. Average XZ = 58. Average YZ = 76. Average length = 84.