Re: [Discuss-gnuradio] Quick CCERA news

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 <patchvonbraun@gmail.com> 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 <patchvonbraun@gmail.com> 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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