search

ADolbyB / sdr-beamforming

This repo is a compilation of code and resources for multiple SDR Platforms as part of a phased array beamforming project.
28 stars 6 forks source link

Phase synchronizing multiple plutos #4

Closed Argonghost closed 6 months ago

Argonghost commented 6 months ago

Hi,

Ive been exploring different methods to do phase synchronizing with multple pluto SDR's and i came across your page. Would your described cross correlation method for multiple pluto's that are fed with a common external clock?

I program pluto using libiio in C actually and i was thinking that using your method in a separate thread would be a good idea. your advise is appreciated.

sincerely,

ADolbyB commented 6 months ago

Hello, thanks for the interest. I have been away for a few days doing research. We needed an external clock to frequency-sync. That still won't phase-sync all channels.

We grabbed this clock module: https://www.ti.com/tool/CDCLVC1310-EVM, however, it comes with a 25MHz clock. This is supposed to be supported by the Pluto, but we have found that this does not work.

We swapped out the crystal for a 40 MHz oscillator and we can confirm this works for frequency-sync. We are not finished with the phase synchronization.

Argonghost commented 6 months ago

Hello, thanks for the interest. I have been away for a few days doing research.

We needed an external clock to frequency-sync. That still won't phase-sync all channels.

We grabbed this clock module: https://www.ti.com/tool/CDCLVC1310-EVM, however, it comes with a 25MHz clock. This is supposed to be supported by the Pluto, but we have found that this does not work.

We swapped out the crystal for a 40 MHz oscillator and we can confirm this works for frequency-sync. We are not finished with the phase synchronization.

Hi! Thanks for your response. Ok perfect, im actually working on this exactly, im using leo bodnar GPSDO, and im trying out cross correlation methods. Definitely looking forward to your page updates to learn !

Argonghost commented 5 months ago

hi @ADolbyB

I hope this post finds you well. Is there any update for pluto phase synchronization??