[USRP-users] Measuring TDOA for Localization

Brian Padalino bpadalino at gmail.com
Thu Jan 9 19:07:21 EST 2020

On Thu, Jan 9, 2020 at 6:45 PM Richard Bell <richard.bell4 at gmail.com> wrote:

> No I don't need to know phase information. I'm cross correlating the pairs
> of receivers and the location of the peak gives me the TDOA. If the
> hardware chains across different radios introduce different delays, that
> would invalidate the TDOA measurement. So long as the delay is the same
> through all the hardware chains, the TDOA estimate will be accurate. Can I
> assume the hardware delay through X300 USRPs with the same FPGA image and
> set to the same sampling frequency will be the same?

I'd think the group delay should be pretty consistent - at least within
10's of nanoseconds of each other if the setup is identical.

What type of variation are you seeing when you perform your cross
correlations?  How much variation are you able to handle?


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