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GR_PLOT_PSD_C(1) |
User Commands |
GR_PLOT_PSD_C(1) |
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]