Hi, I am releasing the ionospheric tomography receiver that I have been working on for a couple of years. The receiver is not related to the GNU Digital Beacon Receiver provided by Prof. Mamoru Yamamoto, which can be used for a similar purpose. The receiver looks at Russian Tsykada, US Radcal, and DMPSF15 satellites that transmit 150 and 400 MHz beacon signals. The FORMOSAT satellites should also be usable, although they do not seem to transmit anything above Northern Scandinavia, so I haven't been able to test them. From these signals, it is possible to derive the relative propagation delay between 150 and 400 MHz (other frequencies can also be used with the receiver). The propagation delay is approximately related with the line integral of the ionospheric electron density between the satellite and the receiver. With a large enough network of receivers, it is possible to perform limited angle tomography of the ionospheric electron density, which is what my group is planning to do with this receiver.
The receiver package that I am now releasing is intended for use with such a large scale tomography receiver chain. The receiver is capable of autonomous operation and it can observe multiple beacon satellites simultaneously. The receiver is written with C++ and the relative propagation delay calculation is performed using GNU R. A normal PC will be able to perform all of these calculations, although you will need about 4 GB of memory for the phase curve calculation part. I am not releasing any tomographic reconstruction software yet, but this might happen in the future. Here is the web site for my receiver, which I am choosing to call Jitter (GNU Ionospheric Tomography Receiver): http://www.sgo.fi/~j/jitter/web/ The software is still in alpha stage, but it has been used with several test receivers for several months of continuous operation. I have used it successfully with usrp1 and two WBX daughterboards, but also recently I have managed to get USRPN210 and TVRX2 working. The receiver can be locked to a GPS reference, but this is not necessary. If you are interested using my receiver, feel free to contact me. juha _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio