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gr_plot_const
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#!/usr/bin/env python
#
# Copyright 2007,2008,2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
try:
import scipy
except ImportError:
print "Please install SciPy to run this script (http://www.scipy.org/)"
raise SystemExit, 1
try:
from pylab import *
from matplotlib.font_manager import fontManager, FontProperties
except ImportError:
print "Please install Matplotlib to run this script (http://matplotlib.sourceforge.net/)"
raise SystemExit, 1
from optparse import OptionParser
class draw_constellation:
def __init__(self, filename, options):
self.hfile = open(filename, "r")
self.block_length = options.block
self.start = options.start
self.sample_rate = options.sample_rate
self.datatype = scipy.complex64
self.sizeof_data = self.datatype().nbytes # number of bytes per sample in file
self.axis_font_size = 16
self.label_font_size = 18
self.title_font_size = 20
# Setup PLOT
self.fig = figure(1, figsize=(16, 9), facecolor='w')
rcParams['xtick.labelsize'] = self.axis_font_size
rcParams['ytick.labelsize'] = self.axis_font_size
self.text_file = figtext(0.10, 0.95, ("File: %s" % filename), weight="heavy", size=16)
self.text_file_pos = figtext(0.10, 0.90, "File Position: ", weight="heavy", size=16)
self.text_block = figtext(0.40, 0.90, ("Block Size: %d" % self.block_length),
weight="heavy", size=16)
self.text_sr = figtext(0.60, 0.90, ("Sample Rate: %.2f" % self.sample_rate),
weight="heavy", size=16)
self.make_plots()
self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True)
self.button_left = Button(self.button_left_axes, "<")
self.button_left_callback = self.button_left.on_clicked(self.button_left_click)
self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True)
self.button_right = Button(self.button_right_axes, ">")
self.button_right_callback = self.button_right.on_clicked(self.button_right_click)
self.xlim = self.sp_iq.get_xlim()
self.manager = get_current_fig_manager()
connect('draw_event', self.zoom)
connect('key_press_event', self.click)
connect('button_press_event', self.mouse_button_callback)
show()
def get_data(self):
self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//self.sizeof_data))
try:
iq = scipy.fromfile(self.hfile, dtype=self.datatype, count=self.block_length)
except MemoryError:
print "End of File"
else:
# retesting length here as newer version of scipy does not throw a MemoryError, just
# returns a zero-length array
if(len(iq) > 0):
self.reals = scipy.array([r.real for r in iq])
self.imags = scipy.array([i.imag for i in iq])
self.time = scipy.array([i*(1/self.sample_rate) for i in range(len(self.reals))])
return True
else:
print "End of File"
return False
def make_plots(self):
# if specified on the command-line, set file pointer
self.hfile.seek(self.sizeof_data*self.start, 1)
r = self.get_data()
# Subplot for real and imaginary parts of signal
self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.2, 0.4, 0.6])
self.sp_iq.set_title(("I&Q"), fontsize=self.title_font_size, fontweight="bold")
self.sp_iq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold")
self.sp_iq.set_ylabel("Amplitude (V)", fontsize=self.label_font_size, fontweight="bold")
self.plot_iq = self.sp_iq.plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-')
# Subplot for constellation plot
self.sp_const = self.fig.add_subplot(2,2,1, position=[0.575, 0.2, 0.4, 0.6])
self.sp_const.set_title(("Constellation"), fontsize=self.title_font_size, fontweight="bold")
self.sp_const.set_xlabel("Inphase", fontsize=self.label_font_size, fontweight="bold")
self.sp_const.set_ylabel("Quadrature", fontsize=self.label_font_size, fontweight="bold")
self.plot_const = self.sp_const.plot(self.reals, self.imags, 'bo')
# Add plots to mark current location of point between time and constellation plots
self.indx = 0
self.plot_iq += self.sp_iq.plot([self.time[self.indx],], [self.reals[self.indx],], 'mo', ms=8)
self.plot_iq += self.sp_iq.plot([self.time[self.indx],], [self.imags[self.indx],], 'mo', ms=8)
self.plot_const += self.sp_const.plot([self.reals[self.indx],], [self.imags[self.indx],], 'mo', ms=12)
# Adjust axis
self.sp_iq.axis([self.time.min(), self.time.max(),
1.5*min([self.reals.min(), self.imags.min()]),
1.5*max([self.reals.max(), self.imags.max()])])
self.sp_const.axis([-2, 2, -2, 2])
draw()
def update_plots(self):
self.plot_iq[0].set_data([self.time, self.reals])
self.plot_iq[1].set_data([self.time, self.imags])
self.sp_iq.axis([self.time.min(), self.time.max(),
1.5*min([self.reals.min(), self.imags.min()]),
1.5*max([self.reals.max(), self.imags.max()])])
self.plot_const[0].set_data([self.reals, self.imags])
self.sp_const.axis([-2, 2, -2, 2])
draw()
def zoom(self, event):
newxlim = scipy.array(self.sp_iq.get_xlim())
curxlim = scipy.array(self.xlim)
if(newxlim[0] != curxlim[0] or newxlim[1] != curxlim[1]):
self.xlim = newxlim
r = self.reals[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]
i = self.imags[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]
self.plot_const[0].set_data(r, i)
self.sp_const.axis([-2, 2, -2, 2])
self.manager.canvas.draw()
draw()
def click(self, event):
forward_valid_keys = [" ", "down", "right"]
backward_valid_keys = ["up", "left"]
trace_forward_valid_keys = [">",]
trace_backward_valid_keys = ["<",]
if(find(event.key, forward_valid_keys)):
self.step_forward()
elif(find(event.key, backward_valid_keys)):
self.step_backward()
elif(find(event.key, trace_forward_valid_keys)):
self.indx = min(self.indx+1, len(self.time)-1)
self.set_trace(self.indx)
elif(find(event.key, trace_backward_valid_keys)):
self.indx = max(0, self.indx-1)
self.set_trace(self.indx)
def button_left_click(self, event):
self.step_backward()
def button_right_click(self, event):
self.step_forward()
def step_forward(self):
r = self.get_data()
if(r):
self.update_plots()
def step_backward(self):
# Step back in file position
if(self.hfile.tell() >= 2*self.sizeof_data*self.block_length ):
self.hfile.seek(-2*self.sizeof_data*self.block_length, 1)
else:
self.hfile.seek(-self.hfile.tell(),1)
r = self.get_data()
if(r):
self.update_plots()
def mouse_button_callback(self, event):
x, y = event.xdata, event.ydata
if x is not None and y is not None:
if(event.inaxes == self.sp_iq):
self.indx = searchsorted(self.time, [x])
self.set_trace(self.indx)
def set_trace(self, indx):
self.plot_iq[2].set_data(self.time[indx], self.reals[indx])
self.plot_iq[3].set_data(self.time[indx], self.imags[indx])
self.plot_const[1].set_data(self.reals[indx], self.imags[indx])
draw()
def find(item_in, list_search):
try:
return list_search.index(item_in) != None
except ValueError:
return False
def main():
usage="%prog: [options] input_filename"
description = "Takes a GNU Radio complex binary file and displays the I&Q data versus time and the constellation plot (I vs. Q). You can set the block size to specify how many points to read in at a time and the start position in 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 axis, set the sample rate (-R or --sample-rate) to the sample rate used when capturing the samples."
parser = OptionParser(conflict_handler="resolve", usage=usage, description=description)
parser.add_option("-B", "--block", type="int", default=1000,
help="Specify the block size [default=%default]")
parser.add_option("-s", "--start", type="int", default=0,
help="Specify where to start in the file [default=%default]")
parser.add_option("-R", "--sample-rate", type="float", default=1.0,
help="Set the sampler rate of the data [default=%default]")
(options, args) = parser.parse_args ()
if len(args) != 1:
parser.print_help()
raise SystemExit, 1
filename = args[0]
dc = draw_constellation(filename, options)
if __name__ == "__main__":
try:
main()
except KeyboardInterrupt:
pass