In spring 1986 I participated in land survey for the future station SVETLOE. 17 years later I had a chance to look at the first VLBI results with SVETLOE and eventually I learned coordinates of that station:

Position and velocity at epoch 1997.01.01

     X Comp       2730173964. -+ 17. mm
     Y Comp       1562442580. -+ 18. mm
     Z Comp       5529969035. -+ 11. mm

     X Velo            -18.16 -+ 2.713 mm/yr
     Y Velo             14.05 -+ 2.909 mm/yr
     Z Velo              4.99 -+ 1.478 mm/yr

These positions are consistent with the gsf2003b solution. Of course, station velocity cannot be determined from one experiment, therefore the value above is in fact apriori velocity according to NUVEL1-NNR tectonic model with formal uncertainties 3 mm/yr for vertical components and 0.1 mm/yr for the vertical one. That's why positions of the station at 1997.01.01 have large uncertainties.

Position at epoch 2003.03.07

     X Comp       2730173852.0 -+ 3.2 mm 
     Y Comp       1562442666.4 -+ 1.9 mm 
     Z Comp       5529969065.9 -+ 5.9 mm 

Data losses

Station codes:
Kokee      (K)
Algonquin  (G)
Gilcreek   (A)
Fortaleza  (F)
Wettzell   (V)
Ny Alesund (O):  warm receiver                               
Matera     (I):  warm receiver
Svetloe    (S):  OK 


Qcodes   0  1  2  3  4  5  6   7   8    9  A  B  C  D   E  F  G  H   N   -  Tot
-------------------------------------------------------------------------------
GS:X     2  0  0  0  0  0  0   0   4   57  0  0  0  0   0  0  0  0  12   1   76
GS:S     3  0  0  0  0  0  1   0   4   55  0  0  0  0   0  0  0  0  12   1   76
FS:X     3  0  0  0  0  0  0   5   4   24  0  0  0  0   0  0  0  0   9   6   51
FS:S     2  0  0  0  0  0  0   0   1   33  0  0  0  0   0  0  0  0   9   6   51
AS:X     3  0  0  0  0  0  0   0   8   56  0  0  0  1   0  0  0  0  11   0   79
AS:S     3  0  0  0  0  0  2   4  16   40  0  0  0  0   2  0  0  0  12   0   79
KS:X     3  0  0  0  0  0  1   2   9   28  0  0  0  1   0  0  0  0   6   0   50
KS:S     3  0  0  0  0  0  0   1   4   34  0  0  0  0   1  0  0  0   7   0   50
IS:X     5  0  0  0  0  0  0   0   3   83  0  0  0  0   0  0  0  0  18   3  112
IS:S     4  0  0  0  0  1  1   1  18   60  0  0  0  0   1  0  5  0  18   3  112
OS:X     4  0  0  0  0  0  0   1  13   54  0  0  0  1   0  0  0  0  41   1  115
OS:S     2  0  0  0  0  4  1   6  12   46  0  0  0  0   1  0  0  0  42   1  115
SV:X     4  0  0  0  0  0  0   2   4   78  0  4  0  7   1  0  0  0  19   2  121
SV:S     7  0  0  0  0  0  0   1   3   76  0  0  0  2   2  0  3  0  25   2  121

-------------------------------------------------------------------------------


Legend:
 QC = 0    Fringes not detected.
    = 1-9  Fringes detected, no error condition. Higher number = better quality.
    = B    Interpolation error in fourfit.
    = D    No data in one or more frequency channels.
    = E    Maximum fringe amplitude at edge of SBD, MBD, or rate window.
    = F    "Fork" problem in processing.
    = G    Fringe amp in a channel is <.5 times mean amp (only if SNR>20).
    = H    Low Phase-cal amplitude in one or more channels.
    = N    No valid correlator data.
 Tot       Total number of scans in schedule.
 Minus     Scans in original schedule file for which correlation was not
             attempted, usually because of known station problems.

========

07_MAR_03 04:05:05  03:32-source off
07_MAR_03 04:05:51  03:32-source off
07_MAR_03 04:07:17  03:55-tape is not
07_MAR_03 05:33:03  tape is not stop on end position source 1156+295 2003066 03h57m
07_MAR_03 05:39:28  operator Tanya Andreeva
07_MAR_03 07:50:31  sky conditions-clearly

Despite of losses of about half of data it was possible to get a reasonable solution. Formal uncertainties of site position are at the level of 2mm for the horizontal components and 5 mm for the vertical component. Plots of postfit residuals + clock function:

• All stations: page 1 and page 2.


• Baseline ALGOPARK/SVETLOE


• Baseline FORTLEZA/SVETLOE


• Baseline GILCREEK/SVETLOE


• Baseline KOKEE/SVETLOE


• Baseline MATERA/SVETLOE


• Baseline NYALES20/SVETLOE


• Baseline SVETLOE/WETTZELL

SEFD

                             SEFD in Jy
Station           S-band                 X-band
           Observed  Scheduled   Observed Scheduled 
ALGOPARK       160.       250.       180.       200.
FORTLEZA      2086.      3000.      3976.      3000.
GILCREEK       660.       800.       678.       750.
KOKEE          473.       750.       855.       900.
MATERA        2466.      1300.      2936.      1500.
NYALES20      1853.      1200.      3176.       900.
SVETLOE        442.       600.       319.       400.
WETTZELL       620.      1115.       816.       750.

System temperature

1. Plot of raw system temperature shows that the the system temperature at channel 6 was very bad. Why?
2. The 6-th channel also had parity error in overflow.
3. zenith system temperature is rather stable. At the same time the values in IF1, channels 1-4, are quite different from the values in IF3, channels 5-8. Presumably, calibration is not done correctly.
4. Dependence of the zenith system temperature on elevation does not show surprises.

Phase calibration

1. Normalized amplitude versus phase plots allowed to reveal spurious signals in 3,4,7,8 and 9-14 channels. The most significant spurious signal, as it seen from the table is the C-spur in channel #4.
2. Analysis of residual phases after removal of the model of spurious signals, shows that the residual phase cal phase at channels 1,2,4,12 has peak-to-peak variations 0.1 rad, what is not good, but still tolerable. The plot of residual phase versus total phase does not show anything bad. Stability of phase cal at other channels has peak-to-peak variations what 0.03-0.05, what is considered as good.
3. Total phase cal versus time does not reveal peculiarities, and in general follows changes of air temperature.
4. Kerry Kingham observed significant phase calibration phase offsets. He added the following phase offsets to measured phase calibration phases in order to align fringe phases:

             #1  -12 deg
             #2    6 deg
             #3  -16 deg
             #4   34 deg
             #5    5 deg
             #6   -2 deg
             #7   -6 deg
             #8  -10 deg
             #9    3 deg
             #10  -2 deg
             #11  -6 deg
             #12   7 deg
             #13   1 deg
             #14   5 deg
   

   
   Phase_Doctor found the following phase offsets with respect to those which has been applied during fringing:

    Station SVETLOE    (reference station GILCREEK )
    ================================================
     1-th  Freq. 8212.99 MHz  Offset:  -3.5 deg  -+   0.16   Equ:  2198/   35
     2-th  Freq. 8252.99 MHz  Offset:   0.4 deg  -+   0.15   Equ:  2178/   55
     3-th  Freq. 8352.99 MHz  Offset:   0.3 deg  -+   0.16   Equ:  2194/   39
     4-th  Freq. 8512.99 MHz  Offset:   5.3 deg  -+   0.22   Equ:  2218/   15
     5-th  Freq. 8732.99 MHz  Offset:  -0.1 deg  -+   0.18   Equ:  2193/   40
     6-th  Freq. 8852.99 MHz  Offset:   0.5 deg  -+   0.16   Equ:  2176/   57
     7-th  Freq. 8912.99 MHz  Offset:  -2.3 deg  -+   0.17   Equ:  2178/   55
     8-th  Freq. 8932.99 MHz  Offset:  -0.7 deg  -+   0.17   Equ:  2177/   56
     9-th  Freq. 2227.99 MHz  Offset:   2.2 deg  -+   0.21   Equ:  2107/   37
    10-th  Freq. 2237.99 MHz  Offset:  -1.7 deg  -+   0.18   Equ:  2099/   45
    11-th  Freq. 2257.99 MHz  Offset:  -0.7 deg  -+   0.23   Equ:  2115/   29
    12-th  Freq. 2312.99 MHz  Offset:  -0.5 deg  -+   0.23   Equ:  2106/   38
    13-th  Freq. 2347.99 MHz  Offset:   2.0 deg  -+   0.18   Equ:  2079/   65
    14-th  Freq. 2352.99 MHz  Offset:  -1.1 deg  -+   0.20   Equ:  2125/   19
   

Long term phase stability

1. Residual fringe phases at the baseline ALGOPARK/SVETLOE
2. Residual fringe phases at the baseline GILCREEK/SVETLOE
3. The estimates of clock function show that clock stability was quite good.

Last update: 21-MAR-2003 20:57:27