SWAN
RRI
   
   
   
Frequently Asked Questions
 
WHAT'S NEW ?
 
SWAN IMAGING CHALLENGE 2017
The challenge is to produce a 100 square-degree image of (any part of) the radio sky,
with as much fidelity and as fine a angular-resolution as possible,
using the existing SWAN setup at Gauribidanur.
The available time is about 50 days, more specifically, from 11th Sept to 1st Nov 2017.
 
 
Who are participating in the SWAN IMAGING CHALLENGE 2017 ?
So far, nine teams have informed of their participations and team compositions.
The participating students (+mentors) are from
 
Delhi SWAN Group, coordinated by Nehru Planetarium
(University of Delhi (DU), Manav Rachna University),
Indian Institute of Science Education and Research at Tiruvanantapuram (IISER-TVM),
Indian Institute of Science Education and Research at Mohali (IISER-M),
Siddaganga Institute of Technology at Tumkur (SIT),
Indian Institute of Technology at Madras (IIT-M),
Birla Institute of Technology at Pilani (BITS-Pilani : two teams),
Indian Institute of Technology at Varanasi (IIT-BHU),
Indian Institute of Technology at Kharagpur (IIT-KGP),
and
Indian Institute of Technology at Indore (IIT-I).
 
View the present member-lists of these teams.
 
 
 
 
 
 
 
 
 
Where is SWAN pointing ? (pointing displays below: courtesy Bhawana)
 
Sweetspots, as red crosses, shown along with a reference Sky-map at 34.5 MHz in the background.
(The 35 MHz sky-image data are taken from Dwarakanath & Udayashankar 1990).
 
Zoomed version of the sky area around the present beam pointing (green circle)
 
 
 
What are "sweetspots" in tile beam pointing ?
 
These are a set of directions, about and including local zenith,
for which near perfect phasing of the (4x4 matrix of) antenna elements within a tile
can be realized, with suitable combination(s) of available delay steps in the beamformer electronics/hardware.
In the present case, the sweetspot directions are spaced at about 6 degrees, for spots near the zenith,
and the angular spacing becomes wider, as expected, towards horizon
(as the spacing is, in fact, uniform in sin("tilt-angle")).