.TH GR_PLOT_PSD "1" "2024-09-15" "gr_plot_psd 3.10.11.0" "User Commands"
.SH NAME
gr_plot_psd \- GNU Radio power spectrum plotting
.SH SYNOPSIS
.B gr_plot_psd:
[\fIoptions\fR] \fIinput_filename\fR
.SH DESCRIPTION
Takes a GNU Radio binary file (with specified data type using \fB\-\-data\-type\fR) and
displays the I&Q data versus time as well as the power spectral density (PSD)
plot. The y\-axis values are plotted assuming volts as the amplitude of the I&Q
streams and converted into dBm in the frequency domain (the 1/N power
adjustment out of the FFT is performed internally). The script plots a certain
block of data at a time, specified on the command line as \fB\-B\fR or \fB\-\-block\fR. The
start position in the file can be set by specifying \fB\-s\fR or \fB\-\-start\fR and defaults
to 0 (the start of the file). By default, the system assumes a sample rate of
1, so in time, each sample is plotted versus the sample number. To set a true
time and frequency axis, set the sample rate (\fB\-R\fR or \fB\-\-sample\-rate\fR) to the
sample rate used when capturing the samples. Finally, the size of the FFT to
use for the PSD and spectrogram plots can be set independently with \fB\-\-psd\-size\fR
and \fB\-\-spec\-size\fR, respectively. The spectrogram plot does not display by
default and is turned on with \fB\-S\fR or \fB\-\-enable\-spec\fR.
.SH OPTIONS
.TP
\fB\-h\fR, \fB\-\-help\fR
show this help message and exit
.TP
\fB\-d\fR DATA_TYPE, \fB\-\-data\-type\fR=\fIDATA_TYPE\fR
Specify the data type (complex64, float32, (u)int32,
(u)int16, (u)int8) [default=complex64]
.TP
\fB\-B\fR BLOCK, \fB\-\-block\fR=\fIBLOCK\fR
Specify the block size [default=8192]
.TP
\fB\-s\fR START, \fB\-\-start\fR=\fISTART\fR
Specify where to start in the file [default=0]
.TP
\fB\-R\fR SAMPLE_RATE, \fB\-\-sample\-rate\fR=\fISAMPLE_RATE\fR
Set the sampler rate of the data [default=1.0]
.TP
\fB\-\-psd\-size\fR=\fIPSD_SIZE\fR
Set the size of the PSD FFT [default=1024]
.TP
\fB\-\-spec\-size\fR=\fISPEC_SIZE\fR
Set the size of the spectrogram FFT [default=256]
.TP
\fB\-S\fR, \fB\-\-enable\-spec\fR
Turn on plotting the spectrogram [default=False]
.SH "SEE ALSO"
gr_plot_psd_c(1) gr_plot_psd_f(1)