IVS-T2001 
  (International VLBI Service - Terrestical reference frame observations)
                           2002 Jan. 29/30           
                 Notes prepared by Arno Mueskens
        Geodetic Institute of the University of Bonn, Germany

 Nominal Start: 17:30 U.T. on Jan.29 (day 029)
   name     yyddd-hhmmss  15  Gc  Kk  Ny  On  Ts  Ur
   0955+476 02029-173000|  40  90 130 110 150  50 150| 
 Nominal Stop : 17:30 U.T. on Jan.30 (day 030)
   name     yyddd-hhmmss  15  Gc  Kk  Ny  On  Ts  Ur
   1300+580 02030-171308|  40 100 140 130 180  60 180|
   1334-127 02030-171651|  40  40  40          40    |
   1124-186 02030-171820|          40          40  40|
   1034-293 02030-171943|                      40  40|  

Duration:      24 hours
Correlator:    BONN
 
Purpose
=======
The purpose of the IVS-T2 sessions is to monitor the TRF
via monthly sessions. All geodetic stations participate
in at least three T2 sessions each year.
These sessions replace the IRIS-S sessions observed in previous years. 

The TRF determine from single session solutions or from a global 
solution is very important IVS product because this is an 
essential part for creating the ITRF by corresponding IERS Product Center.
A particular strength of VLBI is its contribution to the scale
of the ITRF. Usually the TRF is computed from the 24h sessions
that are dedicated to observing the EOP. 

Network
=======
The standard configuration of the monthly observed IVS-T2        
experiments consists of eight stations. The eight station 
differ in some extent between all available IVS network stations 
from month to month.
Station:     Code   
Gilcreek     Gc (A)
NyAlesund    Ny (N)
Kokee        Kk (K)
DSS15        15 (D)
Onsala       On (T)
Matera       Mt (I)                                
Urumqi       Ur (U)
Tsukuba      Ts (s)

Schedule
========
This  schedule  was  generated  by SKED using the EUR2-SX band and
the SX256-4FSX frequency setup, depending on which station are available
for this observation. Variable scan lengths with a minimum 40 sec.
and the most recent  source flux models  are included.
SNR goals are 20 at X-band and 18 at S-band for all baselines.   
The predicted  SNRs used include a 30 ps noise contribution added
in quadrature,  which is a  typical  magnitude for  the  reweight 
constants applied in SOLVE solutions.

The schedule is generated for the estimation of all five (nine)   
earth orientation parameters, clock offsets and clock rates for all
participating stations except the reference station and atmo-
sphere parameters for all participating stations.
It was optimized for three earth orientation parameters  (polar
motion, UT1).

Other optimization features enabled for this experiment :
 - the  covariance analysis during schedule generation considers
   the previous 2 hours of observations,
 - minor SKED optimization parameters
   . maximum number of observations,
   . minimum time,
   were optimized over the best  ( in a covariance sense ) 75% of
   the possible observations, this produces a somewhat  more even
   sky distribution,
 - observations were weighted by their expected SNRs,
 - 30 ps noise contribution added,
 - mimimum time between observations of the same radio source was
   set to 25 min
 - using 59 source for improving the sky covorage

FREQUENCY SEQUENCE      
==================
The GEOSX2F frequency setup is used for this experiment.
This accommodates Tsukuba (2 or 8 Mhz bandwidth only) and
DSS15 and Urumqi (narrow band receivers). The narrow-band
European sequence is one that is modified for RFI avoidance.
Data rate is 256 Mb.s. All stations can record MK4 modes.
This one is fanned out 1:2. The two stations with VLBA
formatters (Gc and Kk) will do barrel roll.

Procedures
==========
NO  PREPASS  TIME: There is no time allowed in the  schedule  for
prepassing tapes. Therefore all tapes needed for this  experiment
must be pre-checked before the start of this experiment.
 
Please generate the procedures for this session using drudg.

THIS SCHEDULE HAS A 10 SECOND EARLY TAPE START !!
----------------------------------------------

STATION INFORMATION
===================
Matera will not participate in this session because of azimuth
encoder problems

Appendix
========
 15=DSS15      Gc=GILCREEK   Kk=KOKEE      Ny=NYALES20   On=ONSALA60
 Ts=TSUKUB32   Ur=URUMQI

                  15  Gc  Kk  Ny  On  Ts  Ur  Avg
 % obs. time:     24  28  37  31  32  25  36  31
 % cal. time:      5   5   5   4   4   5   4   4
 % slew time:     44  25  19  20  21  20  32  26
 % idle time:     25  41  36  42  42  48  25  37
 # of tapes :    1.5 1.6 2.1 1.8 1.8 1.5 2.1
 total # scans:  435 437 462 415 344 474 392 422
 # scans/hour :   18  18  19  17  14  19  16 17.6
 Avg scan (sec):  48  55  70  66  80  45  80  63

      # OF OBSERVATIONS BY BASELINE
   | 15  Gc  Kk  Ny  On  Ts  Ur   StnTotal
 ------------------------------------------
 15|435 349 366 243 179 247 167     1551
 Gc|    437 348 298 201 321 234     1751
 Kk|        462 230 140 339 196     1619
 Ny|            415 310 267 292     1640
 On|                344 188 243     1261
 Ts|                    474 318     1680
 Ur|                        392     1450
 Number of  2-station scans:  239
 Number of  3-station scans:  112
 Number of  4-station scans:  142
 Number of  5-station scans:   89
 Number of  6-station scans:   79
 Number of  7-station scans:   92
 Number of  8-station scans:    2
 Total # of scans, observations:   755    5490

 Average baseline components for all observations
  Average XY     = 5489.
  Average XZ     = 3973.
  Average YZ     = 4225.
  Average length = 5828.