On 07/13/2018 11:28 PM, Jack Yang wrote:
Hi I would like to follow up this conversation. Is it possible to have
a constant initial phase offset for every run when power is up?
I knew the B210 can remains constant phase offset across two receivers
during the operation. However, the challenge for me is that whenever
power is up, the initial phase across devices is not constant. Namely,
the first run v.s. the second run will have different phase offset
across two receiver even though I feed into the same single frequency
tone through the power-splitter. Is there anyway we can fix this thing?
Thanks!
All Best,
Jack
Make sure to use "unknown PPS" in the "sync" options in the source block.
What is the magnitude of the phase-offset difference?
On Fri, Jul 13, 2018 at 8:05 PM, Jack Yang <ccj...@uw.edu
<mailto:ccj...@uw.edu>> wrote:
Hi I would like to follow up this conversation. Is it possible to
have a constant initial phase offset for every run when power is up?
I knew the B210 can remains constant phase offset across two
receivers during the operation. However, the challenge for me is
that whenever power is up, the initial phase across devices is not
constant. Namely, the first run v.s. the second run will have
different phase offset across two receiver even though I feed into
the same single frequency tone through the power-splitter. Is
there anyway we can fix this thing?
Thanks!
All Best,
Jack
On Tue, Mar 24, 2015 at 2:38 PM, Ufuk Tamer via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>>
wrote:
I am using the block in default settings so time sync part is
in default.
On 24.3.2015 23:20, Marcus D. Leech wrote:
On 03/24/2015 05:18 PM, Ufuk Tamer wrote:
I am using the latest version. I have a simple GRC flow
graph that takes two channel I&Q data and then processing
this data in Octave. And every time I turn on the receiver
(tx & rx locations are fixed), I get different phase offset
between two rx channels.
In order to apply direction of arrival (DOA) technique, I
have to first use a reference signal to detect this random
phase offset, remove it and then estimate the angle of
transmitter.
What are you using for time-synch in the UHD source block?
On 24.3.2015 22:12, Marcus D. Leech via USRP-users wrote:
On 03/24/2015 03:12 PM, Ufuk Tamer via USRP-users wrote:
Dear all,
I am testing the phase offset between two Rx channels of
B210. For this case, I transmit a sine signal with another
USRP device and receive it with two RX channels of B210.
Then I calculate the phase offset between channels. The
problem is the phase offset changes whenever I reset the
receiver. So it gives a random phase offset on each device
turn on.
Is this normal? If yes, what is the reason for this random
phase offset. Since both channels share the same LO, where
this "random" phase offset come from?
Thank you...
------------------------------------------------------------------------
/*Ufuk Tamer
*/
What version of UHD are you using?
How are you doing the two-channel receive?
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