Hi, everyone.I am doing the estimation angle of arrival by using USRP.
The problem I want to fix is the initial phase offset of each dboards.
From now on, I have searched some knowledge about this issue. But I can
not implement the concept.
those concept I got are below:
- Some kinds of dboard’s initial phase offset can remain constant after
re-tune by timed command (code)
- I saw some AOA finding hardware set using another usrp or dboard to
transmit a reference signal into the USRPs which are receivers connected
to antenna array elements.
Because the dboards I use is not only one type(SBX), so I prefer to use
the reference signal to do calibration of dboard.
My simple hardware set is below:
Two usrp 2932 (with SBX)
One trimble GPSDO to provide 1PPS and 10MHz
I use GNUradio 184.108.40.206 , UHD_003.008.002-0-unknown
I receive a signal by Two usrps which is connected to ‘one antenna’.
Theoretically, when I plot the I Q data from two usrps, I will get same
waveform(phase). But I get the offset still and I find the offset is not
summary of the problems I am suffering:
I do not know where and how to add those ‘timed commands’ which
taught in the USRP Hardware Driver and USRP Manual.
(I saw someone said that I can do nothing and the initial offset of SBX
will remain constant after retuning. But the result tell me it’s not
Can anybody provide or teach me the code of phase calibration by
using another USRP ??? I saw some presentation but there is no source
code I can learn…
I try to use the two port (RX1 and RX2) to receive the signals in the
same time, but I failed.
I really do not understand how to set the gnuradio blocks to complete
any example could provide to me or anyone can help me??
(I think I know those concepts and knowledge but I can implement it in
hardware and software)
thx a lot !!