The DiFX Software Correlator at IRA R I IRA-INAF /
The DiFX Software Correlator at IRA R I IRA-INAF /
The DiFX Software Correlator at IRA R I IRA-INAF /
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4.2 vex2config.pl (vex2difx)<br />
Input files<br />
.skd (vex file)<br />
Output files<br />
.input<br />
We use vex2config.pl to produce the .input file for the correl<strong>at</strong>or.<br />
4.3 calcif (NRAO-<strong>DiFX</strong>)<br />
Input files<br />
.calc<br />
Output files<br />
.uvw<br />
.delay<br />
.r<strong>at</strong>e<br />
calcif is the program which interacts with calc/solve. A .calc file is<br />
the main input. calcif interacts with calc/solve via calc server (which<br />
may run on a separ<strong>at</strong>e machine). <strong>The</strong> three output files are all simple<br />
ASCII tables.<br />
• .uvw contains the UV coordin<strong>at</strong>es of the antennas for the dur<strong>at</strong>ion<br />
of the observ<strong>at</strong>ion.<br />
• .delay contains the geometric delay of each of the antennas for the<br />
dur<strong>at</strong>ion of the observ<strong>at</strong>ion.<br />
• .r<strong>at</strong>e contains a simple <strong>at</strong>mospheric model.<br />
<strong>The</strong> .r<strong>at</strong>e file is not used for the correl<strong>at</strong>ion but adds a table to the final<br />
fits file. <strong>The</strong> .uvw and .delay files are used by <strong>DiFX</strong>. All three are used<br />
by difx2fits.<br />
4.4 difx2fits (NRAO-<strong>DiFX</strong>)<br />
Input files<br />
Output files<br />
.difx tsys .FITS<br />
.uvw pcal<br />
.delay flags<br />
.r<strong>at</strong>e we<strong>at</strong>her<br />
This program takes a variety of inputs, the most important being the<br />
correl<strong>at</strong>or output, and produces a fits-idi file.<br />
Some of the input files are optional.<br />
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