Re: [Discuss-gnuradio] Event Detection and Spectral Line Radio Astronomy Working.

[Marcus D. Leech]

On 04/09/2019 01:00 PM, Glen I Langston wrote:

Hello Gnu-Radio.

We’ve been working to get Radio Astronomy working reliably in Gnuradio.   A number of

folks have made some excellent contributions to this area.

Kevin Bandura and I have been working with the Green Bank Observatory to develop

horns for observation of the spiral arm structure of the Milky Way.   The

guides are at http://opensourceradiotelescopes.org

The latest Gnuradio spectroscopy and event detection graphs are in the West Virginia University 

contributions to GitHub; i.e. 

git clone http://github.com/WVURAIL/gr-radio_astro

Follow the instructions to install the graph and build the code.

The documentation on the graphs are at: 

https://github.com/WVURAIL/gr-radio_astro/tree/master/docs

There are some configuration files tuned with Radio Astronomy, but the event detection 

code (written in C++) should have a wide applicability for detection of glitches in your 

time series of samples.   Attached is an image of radio transient detected in February 2019,

that has the characteristics consistent with a cosmic ray flash, that is part of our science

target.

The radio astronomy graphs have been used with Airspy, Airspy-mini, the various RTLSDR dongles, PlutoSdr and LimeSdr

hardware.

So, one of the problems with "singleton" events is that they aren't unambiguously "the thing that you're looking for".  Glitches from
  RFI are very common, for example.  If you had events like this from two independent antennae+receiver chains, they might be
  "meaningful", for certain values of "independent". 

Someone in Gnuradio pointed out that a lot of our code was concerned more with post process of recorded data

than truly part of gnu radio.   Now, all the post-processing code, and some documentation is obtained with

git clone http://www.github.com/glangsto/analyze

Finally, we’d like some help with one aspect of event detection.

Right now we’re limited to about 6MHz bandwidth (12 MHz samples) with the existing hardware/software.

We’d like to use the Analog Devices PlutoSdr internal computer to sample at a higher data rate (50 MHz or so), but

only detect rare transients at a rate of once or twice a minute.

That's not likely to be fruitful.  The PlutoSDR internal ARM CPU is in no way "up to the task", and the FPGA is rather full, but if it's
  at all possible, the FPGA is the place to do it.

We’d like to update the Pluto firmware to perform this task, while simultaneously allowing Gnuradio to

run on the host pc/single board.  

The code is already complete, but not ported to the PlutoSdr.  Anyone interested in collaborating

on this project?

Thanks

Glen Langston

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