NAME

       gr_plot_psd - 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]

SEE ALSO

       gr_plot_psd_c(1) gr_plot_psd_f(1)

gr_plot_psd 3.5                                   December 2011                                   GR_PLOT_PSD(1)