On 09/20/2019 12:59 PM, Glen Langston wrote:
Very nice work Marcus!
We’re working on various images of the sky too. I’ve now got 4 horns
running simultaneously
making transit observations at different elevations. These all use
gnu radio for the data takings software and run on Raspberry Pi 4s in
computer boxes
at the base of each horn. We need scans spaced by about 5 degrees
elevation, so
takes 23 scans, divided by 4 telescopes, = 6 days. Plus calibration
observations.
We now have a central host that has a GPS receiver and provides a NTP
timing reference
to each of the Pis. All are now powered over ethernet, so only one
ethernet cable to each horn.
The code and documentation is all at
http://www.github.com/WVURAIL/gr-radio_astro
and analysis which is really, not a part of gnu-radio, at
http://www.github.com/glangsto/analyze
Regards
Glen
PS What software are you using for gridding/mapping?
A collection of "Ad Hoc" stuff. The piece of code that runs every two
minutes to produce
http://www.ccera.ca/files/live_data/BINOCULAR/live_spec.png
Also as a side effect, computes brightness pixels in files. Those
pixels are all processed by a chunk of Python
that uses MatPlotLib to produce the final plots.
On Sep 20, 2019, at 12:14 PM, Marcus D. Leech
<[email protected] <mailto:[email protected]>> wrote:
On 09/20/2019 07:47 AM, Glen Langston wrote:
Very nice map of the entire sky.
I’m looking forward to your memo.
Best regards
Glen
A goodly chunk of it anyway--about 75% of the northern sky
We might be able to get another 5 degrees northwards, but towards the
south, we can't go below -35 without running into ground clutter
issues...
On Sep 20, 2019, at 12:16 AM, Marcus D. Leech
<[email protected] <mailto:[email protected]>> wrote:
I haven't posted any CCERA updates recently--mostly because there
hasn't been much of relevance to this group.
But the most recent update at least contains a pretty picture:
http://www.ccera.ca/uncategorized/ccera-completes-first-pass-of-21cm-sky-survey/
I'll be working on a memo in our "memo" series about the overall
system, software, etc.
Marcus Leech
President
Canadian Centre for Experimental Radio Astronomy
http://www.ccera.ca
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