spacecruft
/
pystrf
1
0
Fork 0
Code Releases Activity

Removinf doppler correction when marked on satnogs artifact

merge-requests/2/head
Michał Drzał 2022-06-26 14:05:33 +02:00 committed by GitHub
parent 8c41a4c63d
commit b6d7083057
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
rfplot.py
View File

@ -69,9 +69,9 @@ def main():
s = Spectrogram.from_artifact(args.path)
site = {"lat" : s.location["latitude"],"lon" : s.location["longitude"],"height" : s.location["altitude"]}
site_location = wgs84.latlon(site["lat"], site["lon"], site["height"])
satellite = EarthSatellite(s.tle[-2], s.tle[-1])
base_satellite = EarthSatellite(s.tle[-2], s.tle[-1])
timestamps = [ x.replace(tzinfo=utc) for x in s.t]
pos = (satellite - site_location).at(ts.utc(timestamps))
pos = (base_satellite - site_location).at(ts.utc(timestamps))
_, _, _, _, _, range_rate_base = pos.frame_latlon_and_rates(site_location)
range_rate_base = range_rate_base.km_per_s
else:
@ -102,14 +102,21 @@ def main():
fig, ax = plt.subplots(figsize=(10, 6))
def get_doppler_correction(site, satellite, t, frequency): # frequency in Hz
_, _, _, _, _, range_rate = (satellite - site).at(t).frame_latlon_and_rates(site)
return range_rate.km_per_s / C * frequency
def plot_to_file(array):
print(array.shape)
ts1 = Time([mdates.num2date(x) for x in array[:,0]]).mjd
freqs = np.array([x + fcen *1e-6 for x in array[:,1]])
freqs = np.array([*1e6 + fcen for x in array[:,1]])
if base_satellite is not None:
temp_t = ts.utc([mdates.num2date(x) for x in array[:,0]])
freqs -= get_doppler_correction(site_location, base_satellite, temp_t, fcen)
with open("mark.dat","w") as f:
for t, freq in zip(ts1,freqs):
f.write(f"{t} {freq}\n")
f.write(f"{t} {freq} 10 {args.site}\n")
return ts1, freqs