-
-
Save daniestevez/9bf2a1f6f01bf0a745a9be406ba60c3d to your computer and use it in GitHub Desktop.
LilacSat-1 downlink usage analysis
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/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') |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment