gr_plot_psd - GNU Radio power spectrum plotting

NAME SYNOPSIS DESCRIPTION OPTIONS SEE ALSO

NAME

gr_plot_psd − GNU Radio power spectrum plotting

SYNOPSIS

gr_plot_psd: [options] input_filename

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]