PSD Display from USRP Data

Hello G.s,

I am very new to GNU Radio. I am trying to develop a python program that
graphically displays data from USRP which sweeps a user-defined
frequency
band from down-freq to up-freq. USRP is tuned to divide the input band
to 3
MHz sub-bands and return the power spectral density. I am using
usrp.source_c to connect to the board. I have two threads, one running
GUI
and shows the input of PSD; the second one stores the FFT components of
each
sub-band to a file. In the GUI, I use fftsink2.usrp_sink_c() to display
the
PSD for the currect scanning band. But what I can not display is the
current
sub-band whose FFT result are plotted by usrp_sink_c. That’s because on
the
X-axis of the plot I have the center frequency 0 and freq ranging from
-1.5
MHz to 1.5 MHz. What I need is either having the whole spectrum being
plotted with history, not just the current scanned sub-band, or
representing
the currect frequency sub-band which is being scanned. I was wondering
If
someone can help me out on this.

Regards,
Rahman Doost

Rahman Doost wrote:

I am very new to GNU Radio. I am trying to develop a python program that
graphically displays data from USRP which sweeps a user-defined
frequency band from down-freq to up-freq. USRP is tuned to divide the
input band to 3 MHz sub-bands and return the power spectral density.

I have code that sweeps a user-defined frequency band, transmits
compressed FFT
spectral data over the network, presents the full swept spectrum (up to
50-2400
MHz) as a scrollable plot using QWT, detects peaks in the power
spectrum, tries
to automatically characterize and identify each peak in numerous
spectrum usage
databases, displays the spatially referenced records in Google Earth and
Celestia, logs detected signals according to user-defined criteria, and
handles
manual (click-to-tune) and automatic tuning of handoff intercept
receivers. At
the moment, my code depends on versions of GNU Radio and GRC from about
two
years ago. Since there’s interest in doing something similar, I’ll
update it
to work with the current trunk and post it somewhere, hopefully in the
next few
weeks.

Can i get the USRP code ?

Rahman Doost wrote:

each
representing


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