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Session Notes for ES087

Prepared by Fengchun Shu, Shanghai Astronomical Observatory
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PURPOSE AND GENERAL NOTES
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==> Ecliptic plane calibrators for nanoradian absolute astrometry <==

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a) Schedule:
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ES087 will be performed on one 24-hour block with 12 stations, 1Gbps data rate, and S/X dual band.

CODE                  EVN   TELESCOPES                                       CORR    TOT    /ST    DAY UT-START    UT-STOP     COMMENTS
====== =========================================================================== ====== ===== == === ======================= ============
ES087  --- --- Ef Mc Nt On60 T6 -- Ur -- Ys Sv Zc Bd Hh -- --(Km)-- ---- --- EVN   132.71 11.06 Eu 294 0100(21/10)-0100(22/10) 3.6/13cm

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b) Frequency:
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The frequency setup is referred to AOV016.
Considering Ef has a low-end of X-band at 8210MHz, the X-band frequencies 
   are shifted 10MHz up for each channel.
Hh low-end of S-band range is 2210MHz, but probably can be lower at 2290MHz 
   (per Jonathan Quick 2017OCT11). 
In order to reduce the impact of possible loss of the SR1U, we move the 
   frequency of the 2nd channel to 2217.99MHz.
The frequency sequence adopted is listed below.

FREQREF  = 8223.99, 8223.99, 8263.99, 8363.99, 8543.99, 8743.99, 8863.99, 8883.99, 8943.99, 8943.99, 2201.99, 2217.99, 2249.99, 2265.99, 2281.99, 2297.99
FREQOFF  =    0.00
NETSIDE  =      L,        U,       U,       U,       U,       U,       U,       U,       L,       U,       U,       U,       U,       U,       U,       U
POL      = RCP  

Noto has no wide X-band, BBC 5-8 are duplicated from BBC 1-4, as shown below.

FREQREF  = 8223.99, 8223.99, 8263.99, 8363.99, 8543.99, 8223.99, 8263.99, 8363.99, 8543.99, 8543.99, 2201.99, 2217.99, 2249.99, 2265.99, 2281.99, 2297.99
FREQOFF  =    0


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c) IFCHAN numbering:
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For the station Ef, according to https://lupus.gsfc.nasa.gov/ivs/ivsdata/aux/2017/t2116/t2116eb.log,
it seems a different ifchan is used.  

   firstlo= 8110,8110,8110,8110,8110, 8110,8110,8110,8110,8110, 2100,2100,2100,2100,2100,2100
!!! original one
!  ifchan  =  A2,  A2,  A2,  A2,  A2,   B2,  B2,  B2,  B2,  B2,   C4,  C4,  C4,  C4,  D4,  D4
!!! revised according to t2116
   ifchan  =  A4,  A4,  A4,  A4,  A4,   B4,  B4,  B4,  B4,  B4,   C2,  C2,  C2,  C2,  D2,  D2
   bbc     =   1,   1,   2,   3,   4,    5,   6,   7,   8,   8,    9,  10,  11,  12,  13,  14

In a similar case, according to https://lupus.gsfc.nasa.gov/ivs/ivsdata/aux/2017/r4810/r4810ys.log,
it seems a different ifchan is used for Yebes40m.

   firstlo= 7650,7650,7650,7650,7650, 8100,8100,8100,8100,8100, 1530,1530,1530,1530,1530,1530
!!! original one
!  ifchan  =  A1,  A1,  A1,  A1,  A1,   B1,  B1,  B1,  B1,  B1,   C2,  C2,  C2,  C2,  D2,  D2
!!! revised according to r4810
   ifchan  =  A1,  A1,  A1,  A1,  A1,   B2,  B2,  B2,  B2,  B2,   C2,  C2,  C2,  C2,  D2,  D2
   bbc     =   1,   1,   2,   3,   4,    5,   6,   7,   8,   8,    9,  10,  11,  12,  13,  14

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d) Station parameters:
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We updated parameters for Kunming (See below), and added antenna slew 
acceleration for Tianma. 

    STCODE=Km
    CONTROL=VEX
    DBNAME=KUNMING
    MOUNT=ALTAZ
    AX1RATE=60
    AX2RATE=30
    AX1LIM=-85,450
    AX2LIM=6,86.6
    AX1ACC=0.5
    AX2ACC=0.3
    TSETTLE=2
    DAR=DBBC
    DBBCVER=ASTRO
    NBBC=16
    DISK=MARK5B
    MEDIADEF=DISK

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e) VEX files:
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In order to reach maximum efficiency by using precious EVN resource, 
we split the participating stations into 2 sub-networks. 
For the east network, T6-Km-Ur-Bd-Zc, the schedule is es087e, 
while for the west network, Ef-Ys-O6-Mc-Nt-Sv-Hh, the schedule is es087w. 
Most of target sources are observed by both networks. 
es087e and es087w will be run in parallel, and be correlated respectively.
 
es087e.vex for T6-Km-Ur-Bd-Zc
es087w.vex for Ef-Ys-O6-Mc-Nt-Sv-Hh

To generate vex files, we used three files as listed below:

es087e-v3.key
es087w-v3.key
es087_setup.txt

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f) SNAP files:
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Snap files are generated for all the stations with patched version of drudg:

     es087ebd.snp
     es087ekm.snp
     es087et6.snp
     es087eur.snp
     es087ezc.snp
     es087wef.snp
     es087whh.snp
     es087wmc.snp
     es087wnt.snp
     es087wo6.snp
     es087wsv.snp
     es087wys.snp

**Please, do not generate snap files yourself!**

But stations need generate procedure files using your local version of 
   drudg as usual.
snap files provides J2000 source coordinates for all stations, except Hh. 
B1950 source coordinates are provided for Hh.


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