[daip] FFT

[Eric Greisen]

AIPS en Tuktoyuk writes:
 > Hi there,
 > 
 > wow, I'm really annoying with all these questions eh??  Sorry about that, I am 
 > an undergraduate student on a coop work term here in Mexico getting some real 
 > experience with astronomy research.  I am reading the AIPS manual and help files 
 >  looking for my answers before I bother you guys with my questions but I keep 
 > running into things I cant solve by reading help or explain files.  I really 
 > appriciate your assistance in making this a successful work term for me, this is 
 > helping me get a good grasp on the AIPS task's to work with radio telescope 
 > data.
 > 
 >   What I am trying to do is FFT the single-dish data I have to the UV domain to 
 > compare it to my interferometer UV data by plotting them as Amplitude Vs 
 > Baselength.  With these plots I will compare the amplitudes of the two UV sets 
 > in the 'overlap region' to determine a scaling factor.  Then I can scale, add 
 > the two in the UV domain and FFT(inverse) back to the image plane for a final 
 > image for analysis by my supervisor so he can write a paper for Astronomy 
 > Journal or another journal.
 >   
 >  I have used FFT but I have problems with it.  First of all it makes map files 
 > of the UV data not UV files to be plotted in UVPLT.  Is there a way I can plot 
 > amplitude Vs baselength for these map files of the UV data from FFT??

   Try IRING - not you may have to COMB the real and imaginary parts
images made by FFT to an amplitude image (sqrt (real**2+imag**2) =
'POLI')

Eric Greisen

 >  
 >  Have a great day,
 >  Thanks again,
 >  
 >  Kyle Mede 
 > 
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