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Freya - a 3D meteor visualising software

Freya (FREquencY Analysis) is a visualising tool for live-viewing a signal received by a station. It is suitable especially for presenting the data to visitors thanks to its simple intuitive representation of waterfall diagram that does not contain any details. Thus it differs from PySDR software, which, on the contrary, serves as a tuning tool when servicing stations.

Freya connects via TCP to port 3731, which provides a reduced data stream.


sudo apt-get install python-sdl2 python-opengl python-numpy

Devices that do not have the python-sdl2 package available, it is necessary to use Python package system. In such case, it is also necessary to install the SDL2 library on your own.

sudo apt-get install libsdl2-dev libsdl2-ttf-dev python-setuptools

Next command will install pysdl from Python package system:

sudo easy_install pysdl2

Installation under Windows

Freya visualising software runs under OS Windows 7 and windows 8. Other Windows versions are not supported.

Download an archive file with software from our web.

Unpack the Freya folder to a place where you keep your software in Windows (e.g. C:\). Folder also contains a shortcut, that you can move to a place where you want to run Freya from. The shortcut has to be modified (via properties) so that the paths correspond to the folder where the Freya software is actually located. Furthermore it is necessary to replace (in startup parameters) with a correct IP address of your station in the local network. Station’s IP address can be easily found directly on station by running a ipconfig command on terminal, e.g.:

odroid@radio-nachodsko:~$ ifconfig -a
eth0      Link encap:Ethernet  HWaddr c2:22:09:f2:5f:e8  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::c022:9ff:fef2:5fe8/64 Scope:Link
          RX packets:5215531 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9172299 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:309584984 (309.5 MB)  TX bytes:4154310596 (4.1 GB)

lo        Link encap:Local Loopback  
          inet addr:  Mask:
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:131611838 errors:0 dropped:0 overruns:0 frame:0
          TX packets:131611838 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:391859078143 (391.8 GB)  TX bytes:391859078143 (391.8 GB)


In our case, the station’s IP address is:

Detailed procedure

Install Miniconda to any directory. Open command line, move to the Miniconda’s directory and use the following commands to install Freya’s dependencies (shift, right mouse click, open terminal in chosen destination).

Scripts\conda.exe install numpy pyopengl
Scripts\easy_install.exe pysdl2

Next, copy SDL2.dll library into Miniconda’s directory (the library can be found here in Runtime Binaries section) and the Freya itself (here).


\path\to\miniconda\python.exe \path\to\miniconda\ STATION’S_NETWORK_ADDRESS

The following example shows how to run a data visualisation form station if the Miniconda is installed in C:\Miniconda:

C:\Miniconda\python.exe C:\Miniconda\

Remote playback via SSH tunnel

Thanks to ssh tunnelling, we can transfer data from any remote station through a mediation server. You have to use a so-called port-forwarding, an technique enabling opening a port from a station to a server and from a client’s computer to a server. To open a tunnel, follow the example below:

Sign in to a chosen station. Open a port to server that would serve as a mediator of the data transfer.

odroid@radio-svakov:~$ ssh -R 5000:localhost:3731 -N

Next, open a tunnel from your computer to the mediation server.

kaklik@popelnice:~$ ssh -L 3731:localhost:5000 -N

Use another terminal to run Freya with a reference to the local computer - as if you run the Freya directly on the station.

kaklik@popelnice:~/git/pysdr/tools$ python localhost
en/freya.txt · Last modified: 2019/05/01 14:10 by fluktuacia