VLBI fringe stopping

David Lonard

unread,

Feb 14, 2022, 3:19:57 PM2/14/22

to Amateur radio interferometry

Hello everyone,

I've been playing around with some more fringe stopping work and this is really starting to get some nice results (see attached). Also, included is some updated code to accomplish time and frequency dependent fringe stopping.

CasA and CygA are (likely) what I'm seeing as two species of dominant fringing in the attached file.

Also included is some additional information about how to work with VLBI data regarding placing a 'delay center'.

David

VLBIread.py

VLBI fringe stopping 2-14-2022.pdf

David Lonard

unread,

Feb 14, 2022, 4:32:33 PM2/14/22

to Amateur radio interferometry

Also, I did an inverse FFT of the fringe stopped data and I can see three sources (the three nearly vertical lines). See this link for some more info on delay imaging.

https://www.google.com/url?sa=i&url=http%3A%2F%2Flwa.phys.unm.edu%2Fchicago08%2Ftalks%2F2008-08-10_AIPY_Presentation.pdf&psig=AOvVaw17eCfiFiotwi3Nz5STgawM&ust=1644960661795000&source=images&cd=vfe&ved=0CAwQjhxqFwoTCKCl6JWSgPYCFQAAAAAdAAAAABAD

VLBIifft.jpeg

David Lonard

unread,

Feb 15, 2022, 1:02:06 PM2/15/22

to Amateur radio interferometry

Integration of the three sources shows a nice over S/N. No other sources are seen though.

integrated sources.jpeg

Reply all

Reply to author

Forward