[USRP-users] Measuring TDOA for Localization

Brian Padalino bpadalino at gmail.com
Thu Jan 9 15:51:20 EST 2020

On Thu, Jan 9, 2020 at 12:14 PM Richard Bell via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hello,
> I'm working on a TDOA based localization platform using 3 USRP X300's as
> receivers. I have them synchronized with a 10 MHz ref and PPS signal
> generated by an OctoClock. However, I'm having trouble getting reliable
> localization performance through this system. My TDOA measurements are not
> what I would expect for the geometry I'm using.
> If I have the USRPs flashed with the same FPGA image and I use the same
> sample rate (i.e. 200e6/22 = 9.0909 MHz) across them all, is it possible
> the hardware could still be introducing different delays through each
> receiver?

Did you calibrate their phases using some type of calibration signal such
that you know the relative phase offsets of each radio to each other?

Do you need to not know this information?

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