Creating 4 channel coherent receiver

[Szilandris]

Hi,

I am looking for a suitable sdr solution for creating a 4 channel coherent receiver for passive radar applications.

Is it possible to synchronise multiple of any of the LimeSDR-s in phase using a common clock?

Thanks in advance

[andrewback]

Yes, both LimeSDR USB (2x2 MIMO) and LimeSDR Mini (SISO) have connections for external reference. IIRC there are some steps that will be needed for phase alignment and if you search the forums you will find previous discussions. E.g.:

Synchronize two LimeSDR

Hi! I’ve faced a challenge - synchronize two independent boards distributed in space. Assume both PCs have clocks synced to 50us. I need to achieve 200us synchronization. USRP, AFAIK, has two methods for such case: set_time_now and set_start_time. After setting current time sample time of each sample can be extracted easily. Does LimeSDR have something like that?

[Gluttton]

Hello @Szilandris,

Probably too late.
It seems that there is a board: https://wiki.myriadrf.org/LimeSDR-QPCIe that allows to use 4x4 MIMO out of box. Have you considered it?