Re: [Discuss-gnuradio] Time syncing between SDRs on different computers

[vk4tec]

Are you trying to do MultiLateration using software defined radio ?


-----Original Message-----
From: Sylvain Munaut [mailto:address@hidden 
Sent: Thursday, 17 August 2017 1:20 AM
To: address@hidden
Cc: address@hidden; GNURadio Discussion List <address@hidden>
Subject: Re: [Discuss-gnuradio] Time syncing between SDRs on different computers

On Wed, Aug 16, 2017 at 5:11 PM,  <address@hidden> wrote:
> What type of hardware? I thought from hardware point of view only 
> precise clock is required and all the other things in firmware. I've naively 
> thought i could modify hackrf firmware to get this feature.

Mostly a FPGA and a PPS input from a GPS receiver.

Each individual sample has a timestamp of when it has been received.
And you can also reset the timestamp on the next  PPS edge.

Technically it would be possible to modify the hackrf firmware and repurpose 
some GPIOs and have all samples transmitted to the host be in timestamped 
packets and implements timestamping in the on-board ARM.
For additional hardware you'd only need an external GPS receiver (or some other 
way to have both a single freq reference + single sync pulse).

Cheers,

    Sylvain