https://github.com/akilmarshall/3dradio

3D printable radio dish with a mechanized Az/El mount for observations of the H1 line. Received with the RTL-SDR Blog V4 with the Nooelec SAWBird+ H1 for signal conditioning.
https://github.com/akilmarshall/3dradio

python3 radio-astronomy raspberry-pi

Last synced: 12 days ago
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3D printable radio dish with a mechanized Az/El mount for observations of the H1 line. Received with the RTL-SDR Blog V4 with the Nooelec SAWBird+ H1 for signal conditioning.

• Host: GitHub
• URL: https://github.com/akilmarshall/3dradio
• Owner: akilmarshall
• Created: 2024-12-11T07:45:29.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2025-04-05T01:57:51.000Z (about 1 year ago)
• Last Synced: 2025-09-20T08:55:01.782Z (9 months ago)
• Topics: python3, radio-astronomy, raspberry-pi
• Language: Python
• Homepage:
• Size: 62.5 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Assembly Notes

a washer between the lazy susan and static base is necessary to allow clearance for the bolt heads which attach the azimuth gear to the rotating part of the lazy susan.

# Software

- collect.py

    - control RTL SDR

    - read/write configuration from file

    - produce IQ data sets (np.ndarray)

    - write compressed data sets to file (h5)

- reduce.py

    - read compressed data sets from file (h5) 

    - IQ time series 

    - magnitude phase time series

    - magnitude histogram

    - power spectral density

# TODO

- Subtract away the matched load data in the reductions

- Update the report:

    - show the signal reduction

    - show the matched load reduction

    - show the corrected data (signal - matched load)

## Metadata

- Telescope parameters (reflector parameters):

    - fD

    - name

    - type ?

    - notes

- General:

    - position (lat, long)

    - datetime:

        - start of data collection 

        - end of data collection 

    - load:

        - sky

        - hot

        - cold?

    - notes

    - type:

        - calibration 

        - stare

        - repeat stare

        - frequency switch stare

        - repeat fswitch stare

- SDR (need to keep set & actual process value):

    - center freq

    - gain

    - sample rate

    - n:

        - population of contiguous sample, i.e. 1024 IQ samples 

    - super sample

        - multiple of the sample size, i.e. supersample = 2, then we sample (2 * n) IQ at a time

# hdf5

Use (https://github.com/HDFGroup/hdfview)[hdfview] to inspect the data files.

If you would like to use the cli,

{{{

$ # inspect attributes and groups

$ h5dump -n 

$ # inspect attribute value

$ h5dump -a "/path/to/attribute" 

$ # inspect dataset (maybe don't do this)

$ h5dump -d "/path/to/dataset" 

}}}

- /:

    - latitude 

    - longitude 

    - datetime 

    - row 

    - note 

    - f 

    - D 

    - name 

    - telescope-note 

    - load

    - frequency

    - n

    - super_sample

    - sample_rate

    - data/{n}:

        - frequency 

        - row 

        - super_sample 

        - obs_start_stime 

        - obs_end_stime 

    - data/{n}/IQ:

        - sdr data from antenna

    - data/{n}/reference

        - sdr data from matched load