| Exp code | Date | Obs Time | Data Rate |
Stations |
|---|
| U8193A | 11 July 2008 |
00:00-1:30(UT) | 128Mbps |
Kashima34, Onsala60 |
| U8193B |
02:00-3:30(UT) |
256Mbps |
| U8193C |
04:00-5:30(UT) |
512Mbps |
| U8193D |
06:00-7:30(UT) |
128Mbps |
| U8193E |
08:00-9:30(UT) |
256Mbps |
| U8193F |
10:00-11:00(UT) |
512Mbps |
- 6 sessions (128,256,512,128,256,512) of e-VLBI Experiments were
conducted between Kashima34-Onsala60(20m) baseline.
Also parallel UT1 observation with Metsahovi-Tsukuba32 baseline was conducted at the same time.
Although there were trouble in some channels of S-band at Metsahovi, the observed data could not be used for UT1 estimation.
First 128Mbps session was successful, but session B,C,and D were
failed because the telescopes
at Onsala and Kashima was not working with schedules. Since the
Onsala was
operated without attending a operator, the failure was left until
next morning. Also there were trouble at Kashima 34m in tracking
source from B until the first half of E-session. Operation recovered to
normal from the middle of E-session.
- Two quick analysis have been performed, one was automatic analysis
scheme (analysis core is OCCAM) developed by
T.Hobiger, and the other one was manual analysis with CALC/SOLVE
by H.Takiguchi.
- Observation schedule were made by using 'sked' program developed
by NASA/GSFC with setup
Min-SNR=30(X-band),
25(S-band), MAX#Obs,MinTime, MINSCAN=30sec.,
- Clock parameter for each stations (GSP-FMT=): Kashima(-1.1us),
Onsala(25.9us)
- By using the
SNR plot of former experiments, 1417+385,1044+719, and
0602+673, were excluded from source list.
- Session: U8193A, F, and half of
E-session was suscesful.
- Fringe were detected successfully after the system
recovered to normal state.
Quick analysis was performed. Processing Latency was as
follows:
| Code | Mode | Software |
|---|
| OCCAM(Automatic) | CALC/Solve(Manual) |
| u8193a | 128Mbps | 25 min. |
43m |
| u8193e | 256Mbps | 44 min. |
1h14m |
| u8193f | 512Mbps |
1h42m | 2h01m |
OCCAM was modified for automatic iterative processing by
T.Hobiger.
CALC/SOLVE analysis was performed by H.Takiguchi.
- Clock parameter were Onsala-Kashima = -25.2 us for
256Mbps, and
-33.34us for 512Mbps, respectively.
The clock difference of 8 us will be due to
timing offset of Mark4/Mark5 Formatter.
- Processing (data format conversion and correlation
processing) was rather slow, and it took much time.
The conversion software and correlation processing software
might have to be improved.
| Exp code |
Baseline
ID |
Bandwidth
Synthesis | Analysis |
Epoch |
Estimated UT1-UTC (msec) |
| CALC/SOLVE | OCCAM |
CALC/SOLVE | OCCAM |
CALC/SOLVE | OCCAM |
| U8193A |
Kashim34-Onsala |
komb (X)
and
komb (S)
|
spool file
|
result
|
54658.029861 | 54658.03117 |
-449736.2 +/- 9 us |
-449668.6 +/- 20 us |
| U8193E |
Kashim34-Onsala |
komb (X)
and
komb (S)
|
spool file
|
result
|
54658.363889 | 54658.36974 |
-449838.4 +/- 20 us |
-449757.2 +/- 46 us |
| U8193F | Kashim34-Onsala |
komb
(X) and
komb
(S)
|
spool file
|
result
|
54658.437500 | 54658.43840 |
-449820.2 +/- 9.6 us |
-449718.8 +/- 12 us |