[daip] I have another question for you

Wed Mar 10 11:41:01 EST 2004

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Taehyun, Jung

I am glad that your aunderstanding of UVCON has improved.

>I wonder how I can put the proper value of column 9 - Put
>one if the coordinates are given relatively the Earth's center (VLBI case).
>For the KVN (Korean VLBI Network), the sites are about 400km away from each
>other. Is it better using this col. 9? If so, how can I set the values from
>Col. 1 to Col. 4?

UVCON uses RH equatorial coordinate system inside. So the positions 
of antennas given at the four coordinate systems are recalculated to 
the RH equatorial coordinate system.

Let me consider the two examples to make the concept of col 9 more clear.

Example 1
All your array antennas are given at the same coordinate system. The
origin is at the Earth center (col.1=0,2). Then the values of the
antenna positions at an RH equatorial coordinate sistem will be of
order of millions meters.  Puting COL9=1 in all rows of the input file,
you can decrease the coordinates to the order of the array size.
This is the only advantage COL9=1 at this case.
Actually the simulation result does not depend on the value at COL9 at
this case because COL9=1 at all rows provides the shift of the whole array, 
such a shift does not change the array property (the shift does not
change the baselines).

Example 2
You have VLA given at the RH equatorial coordinate sistem with origin 
at the VLA center. 
You want to add several 'new' antennas located outside of the VLA.
The positions of the new antenna are given at LAT, LON, Elevation COL1=2
You know that UVCON allows using different coordinate system for different antennas. At this case you must using COL9=0 for the VLA antennas and COL9=1 
for the 'new' antennas. Using COL9=1 for the 'new' antennas will make the 
origin of the coordinate system the same as for the VLA antennas: at the array center given at the line 2 of the input file.

I hope it will help. If not, ask again

Leonid Kogan

----- Begin Included Message -----

>From thjung at galaxy.yonsei.ac.kr Wed Mar 10 00:19 MST 2004
From: "thjung" <thjung at galaxy.yonsei.ac.kr>
To: <lkogan at nrao.edu>
Subject: I have another question for you
Date: Wed, 10 Mar 2004 16:19:00 +0900
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Dear Dr. L. Kogan,

Since I had received your reply about UVCON, I could understand how the
UVCON worked. Looking back to it now, I'm a bit ashamed of myself for asking
such a thing. As you said, I should have read the explain notes more
carefully. However, it was very hard to solve the problem for me at that
time. Anyway, I'm really appreciative of your advice. 

As the title says, I have another question about UVCON. According to help
file of UVCON, we can give the array configuration as an input file.
Specifying this, I wonder how I can put the proper value of column 9 - Put
one if the coordinates are given relatively the Earth's center (VLBI case).
For the KVN (Korean VLBI Network), the sites are about 400km away from each
other. Is it better using this col. 9? If so, how can I set the values from
Col. 1 to Col. 4? I'm very glad if you tell me how to specify it with
examples. This may be another poor question. 

Thank you for reading. I hope to hear from you. 

Sincerely yours,

Taehyun, Jung

----- End Included Message -----

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<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'>Dear Dr. L. =
Kogan,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'><o:p> </o:p></span></fo=
nt></p>

Since I had received your =
reply
about UVCON, I could understand how the UVCON worked. Looking back to it =
now, I’m =
a bit
ashamed of myself for asking such a thing. As you said, I should have =
read the
explain notes more carefully. However, it was very hard to solve the =
problem
for me at that time. Anyway, I’m really appreciative of your =
advice. <o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'><o:p> </o:p></span></fo=
nt></p>

As the title says, I have =
another
question about UVCON. According to help file of UVCON, we can give the =
array
configuration as an input file. Specifying this, I wonder how I can put =
the
proper value of column 9 - Put one if the coordinates are given =
relatively the
Earth’s =
center (VLBI
case). For the KVN (Korean VLBI Network), the sites are about 400km away =
from each
other. Is it better using this col. 9? If so, how can I set the values =
from Col.
1 to Col. 4? I’m very glad if you tell me how to specify it =
with examples.
This may be another poor question. <o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'><o:p> </o:p></span></fo=
nt></p>

Thank you for reading. I =
hope to
hear from you. <o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'><o:p> </o:p></span></fo=
nt></p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'>Sincerely =
yours,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'>Taehyun, =
Jung<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'><o:p> </o:p></span></fo=
nt></p>

<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:Gulim'><o:p> </o:p></span></fo=
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<p class=3DMsoNormal><font size=3D2 face=3D굴림><span =
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