gr_plot_psd(1)
GNU Radio power spectrum plotting
SYNOPSIS
gr_plot_psd:
[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
- -d DATA_TYPE, --data-type=DATA_TYPE
-
Specify the data type (complex64, float32, (u)int32,
(u)int16, (u)int8) [default=complex64]
- -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]