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tests for mldsgp4
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@Sceki
Sceki committed Nov 28, 2024
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2 changes: 1 addition & 1 deletion dsgp4/util.py
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Expand Up @@ -51,7 +51,7 @@ def propagate_batch(tles, tsinces, initialized=True):
"""
from .sgp4_batched import sgp4_batched
if not initialized:
initialize_tle(tles)
_,tles=initialize_tle(tles)
state=sgp4_batched(tles, tsinces)
return state

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374 changes: 374 additions & 0 deletions tests/test_mldsgp4.py
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@@ -0,0 +1,374 @@
import dsgp4
import numpy as np
import random
import torch
import unittest

error_string="Error: deep space propagation not supported (yet). The provided satellite has \
an orbital period above 225 minutes. If you want to let us know you need it or you want to \
contribute to implement it, open a PR or raise an issue at: https://github.com/esa/dSGP4."

class UtilTestCase(unittest.TestCase):
def test_mldsgp4_single_tles(self):
lines=file.splitlines()
#I randomly select 50 indexes out of 500 satellites
indexes=list(range(1,len(lines),3))
tles=[]
for i in indexes:
data=[]
data.append(lines[i])
data.append(lines[i+1])
data.append(lines[i+2])
tles.append(dsgp4.tle.TLE(data))

#let's load the ML-dSGP4 model without input/output correction
#this should correspond to just SGP4
ml_dsgp4=dsgp4.mldsgp4(hidden_size=35,
input_correction=0.,
output_correction=0.,
normalization_R=6958.137,
normalization_V=7.947155867983262)
#random times:
tsinces=torch.rand(len(tles),)*10000
for tle in tles:
#we first propagate with the ML-dSGP4:
try:
#we use torch.no_grad() to avoid keeping track of the derivatives:
with torch.no_grad():
states_mldsgp4_out=ml_dsgp4(tle,tsinces)
#let's unnormalize the output:
states_mldsgp4_out[:,:3]*=ml_dsgp4.normalization_R
states_mldsgp4_out[:,3:]*=ml_dsgp4.normalization_V
except Exception as e:
self.assertTrue((str(e).split()==error_string.split()))
#now with the SGP4:
try:
states_dsgp4_out=dsgp4.propagate(tle, tsinces, initialized=False)
except Exception as e:
self.assertTrue((str(e).split()==error_string.split()))
#testing the results:
self.assertTrue(np.allclose(states_mldsgp4_out.detach().numpy().reshape(-1,2,3),states_dsgp4_out.detach().numpy(),atol=1e-13))

def test_mldsgp4_batch_tles(self):
lines=file.splitlines()
#I randomly select 50 indexes out of 500 satellites
indexes=list(range(1,len(lines),3))
tles=[]
for i in indexes:
data=[]
data.append(lines[i])
data.append(lines[i+1])
data.append(lines[i+2])
tles.append(dsgp4.tle.TLE(data))
tles=tles[:20]
#let's load the ML-dSGP4 model without input/output correction
#this should correspond to just SGP4
ml_dsgp4=dsgp4.mldsgp4(hidden_size=35,
input_correction=0.,
output_correction=0.,
normalization_R=6958.137,
normalization_V=7.947155867983262)
#we now create a batch of TLE to later propagate it
tles_=[]
for tle in tles:
tles_+=[tle]*100
tsinces = torch.cat([torch.linspace(0,24*60,100)]*len(tles))

#we first propagate with the ML-dSGP4 and we use torch.no_grad() to avoid keeping track of the derivatives:
with torch.no_grad():
states_mldsgp4_out=ml_dsgp4(tles_,tsinces)
#let's unnormalize the output:
states_mldsgp4_out[:,:3]*=ml_dsgp4.normalization_R
states_mldsgp4_out[:,3:]*=ml_dsgp4.normalization_V
states_dsgp4_out=dsgp4.propagate_batch(tles_, tsinces, initialized=False)
#testing the results:
self.assertTrue(np.allclose(states_mldsgp4_out.detach().numpy().reshape(-1,2,3),states_dsgp4_out.detach().numpy(),atol=1e-12))


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0 COSMOS 2251 DEB
1 34793U 93036AAW 22068.80776917 .00000342 00000-0 12642-3 0 9997
2 34793 74.0020 260.9066 0053385 18.5431 353.3504 14.35371548675985
0 COSMOS 2251 DEB
1 34796U 93036AAZ 22068.93184426 .00000768 00000-0 23839-3 0 9994
2 34796 74.0333 248.2516 0116421 327.7024 155.9459 14.39028736682118
0 COSMOS 2251 DEB
1 34797U 93036ABA 22068.80523530 .00001512 00000-0 62383-3 0 9999
2 34797 73.9824 95.8766 0092337 161.8617 198.5862 14.25350974677447
0 RISAT 2
1 34807U 09019A 22069.20015293 .00039560 00000-0 69476-3 0 9990
2 34807 41.2102 146.3902 0010166 13.1639 10.3869 15.49708764724344
0 BLOCK DM-SL R/B
1 34811U 09020B 22068.85335389 -.00000141 00000-0 00000-0 0 9997
2 34811 2.0707 53.4388 4737112 332.3433 217.9075 1.81487904 85390
"""

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