NAME¶
gr_plot_psd_c - plot power spectral density using GNU Radio
SYNOPSIS¶
gr_plot_psd_c: [
options]
input_filename
DESCRIPTION¶
Takes a GNU Radio binary file (with specified data type using
--data-type) 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
-B or
--block. The start position in the
file can be set by specifying
-s or
--start 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 (
-R or
--sample-rate)
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
--psd-size and
--spec-size, respectively. The spectrogram plot
does not display by default and is turned on with
-S or
--enable-spec.
OPTIONS¶
- -h, --help
- show this help message and exit
- -B BLOCK, --block=BLOCK
- Specify the block size [default=8192]
- -s START, --start=START
- Specify where to start in the file [default=0]
- -R SAMPLE_RATE, --sample-rate=SAMPLE_RATE
- Set the sampler rate of the data [default=1.0]
- --psd-size=PSD_SIZE
- Set the size of the PSD FFT [default=1024]
- --spec-size=SPEC_SIZE
- Set the size of the spectrogram FFT [default=256]
- -S, --enable-spec
- Turn on plotting the spectrogram [default=False]
SEE ALSO¶
gr_plot_char(1) gr_plot_const(1) gr_plot_fft_c(1) gr_plot_fft_f(1)
gr_plot_float(1) gr_plot_int(1) gr_plot_iq(1) gr_plot_psd_c(1)
gr_plot_psd_f(1) gr_plot_qt(1) gr_plot_short(1)