LilacSat-1 downlink usage analysis
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#!/usr/bin/env python3 | |
import numpy as np | |
import matplotlib.pyplot as plt | |
FEND = np.byte(0xc0) | |
kiss = np.fromfile('/tmp/kiss', dtype=np.byte) | |
image = np.empty(kiss.shape, dtype=np.float) | |
other = np.empty(kiss.shape, dtype=np.float) | |
in_image = False | |
in_other = False | |
for i in range(kiss.size): | |
if kiss[i] == FEND: | |
in_image = False | |
in_other = False | |
elif not in_image and not in_other: | |
# start of packet. guess packet type | |
# image packets are sent to CSP dest 6 | |
if (kiss[i+1] >> 4) & 0x7 == 0x6: | |
in_image = True | |
image[i] = 1 | |
else: | |
in_other = True | |
other[i] = 1 | |
elif in_image: | |
image[i] = 1 | |
else: # in other | |
other[i] =1 | |
t = np.linspace(0, image.size/(3400/8), num=image.size) | |
fig = plt.figure(figsize=(25,2)) | |
ax = fig.add_subplot(111) | |
plt.fill_between(t, 0, image, color='blue', linewidth=0) | |
plt.fill_between(t, 0, other, color='red', linewidth=0) | |
plt.title('LilacSat-1 downlink usage (per byte)') | |
plt.xlabel('Time (s)') | |
plt.legend(['Image', 'Other (telemetry)']) | |
plt.axis([0, t[-1], 0, 1]) | |
ax.get_yaxis().set_visible(False) | |
fig.savefig('lilacsat1-perbyte.png', bbox_inches='tight') | |
average = np.ones(int(5*3600/8)) | |
average = average/average.size | |
fig = plt.figure(figsize=(25,10)) | |
plt.plot(t, np.convolve(image, average, mode='same'), color='blue') | |
plt.plot(t, np.convolve(other, average, mode='same'), color='red') | |
plt.plot(t, np.convolve(image+other, average, mode='same'), color='green') | |
plt.legend(['Image', 'Other (telemetry)', 'Total']) | |
plt.title('LilacSat-1 downlink usage (5 second average)') | |
plt.xlabel('Time (s)') | |
plt.axis([0, t[-1], 0, 1]) | |
fig.savefig('lilacsat1-5savg.png', bbox_inches='tight') |
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