1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
#!/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("Qaudrature", 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
|
