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test_tle_predictor.py
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# MIT License
#
# Copyright (c) 2017 Satellogic SA
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import datetime as dt
import unittest
import os
import pickle
import tempfile
from unittest.mock import patch
from orbit_predictor.coordinate_systems import llh_to_ecef
from orbit_predictor.locations import Location, ARG
from orbit_predictor.predictors import (
NotReachable,
Position,
PredictedPass,
TLEPredictor,
)
from orbit_predictor.predictors.base import ONE_SECOND
from orbit_predictor.sources import MemoryTLESource
SATE_ID = 'BUGSAT-1'
BUGSAT1_TLE_LINES = (
"1 40014U 14033E 14294.41438078 .00003468 00000-0 34565-3 0 3930",
"2 40014 97.9781 190.6418 0032692 299.0467 60.7524 14.91878099 18425")
class TLEPredictorTestCase(unittest.TestCase):
@classmethod
def setUpClass(cls):
# Source
cls.db = MemoryTLESource()
cls.db.add_tle(SATE_ID, BUGSAT1_TLE_LINES, dt.datetime.utcnow())
# Predictor
cls.predictor = TLEPredictor(SATE_ID, cls.db)
def test_predicted_pass_eq(self):
aos = dt.datetime.utcnow()
max_elevation_date = dt.datetime.utcnow() + dt.timedelta(minutes=5)
los = dt.datetime.utcnow() + dt.timedelta(minutes=10)
max_elevation_position = Position(
when_utc=max_elevation_date,
position_ecef=(1, 1, 1),
velocity_ecef=(1, 1, 1),
error_estimate=0)
p1 = PredictedPass(
sate_id=1, location=ARG,
aos=aos, los=los, duration_s=600,
max_elevation_date=max_elevation_date,
max_elevation_position=max_elevation_position,
max_elevation_deg=10)
p2 = PredictedPass(
sate_id=1, location=ARG,
aos=aos, los=los, duration_s=600,
max_elevation_date=max_elevation_date,
max_elevation_position=max_elevation_position,
max_elevation_deg=10)
self.assertEqual(p1, p2)
self.assertEqual(p2, p1)
def test_predicted_pass_no_eq(self):
aos = dt.datetime.utcnow()
max_elevation_date = dt.datetime.utcnow() + dt.timedelta(minutes=5)
los = dt.datetime.utcnow() + dt.timedelta(minutes=10)
max_elevation_position = Position(
when_utc=max_elevation_date,
position_ecef=(1, 1, 1),
velocity_ecef=(1, 1, 1),
error_estimate=0)
p1 = PredictedPass(
sate_id=1, location=ARG,
aos=aos, los=los, duration_s=600,
max_elevation_date=max_elevation_date,
max_elevation_position=max_elevation_position,
max_elevation_deg=10)
p2 = PredictedPass(
sate_id=1, location=ARG,
aos=aos, los=los, duration_s=600,
max_elevation_date=max_elevation_date,
max_elevation_position=max_elevation_position,
max_elevation_deg=50)
self.assertNotEqual(p1, p2)
self.assertNotEqual(p2, p1)
def test_predicted_pass_eq_subclass(self):
class SubPredictedPass(PredictedPass):
pass
aos = dt.datetime.utcnow()
max_elevation_date = dt.datetime.utcnow() + dt.timedelta(minutes=5)
los = dt.datetime.utcnow() + dt.timedelta(minutes=10)
max_elevation_position = Position(
when_utc=max_elevation_date,
position_ecef=(1, 1, 1),
velocity_ecef=(1, 1, 1),
error_estimate=0)
p1 = PredictedPass(
sate_id=1, location=ARG,
aos=aos, los=los, duration_s=600,
max_elevation_date=max_elevation_date,
max_elevation_position=max_elevation_position,
max_elevation_deg=10)
p2 = SubPredictedPass(
sate_id=1, location=ARG,
aos=aos, los=los, duration_s=600,
max_elevation_date=max_elevation_date,
max_elevation_position=max_elevation_position,
max_elevation_deg=10)
self.assertEqual(p1, p2)
self.assertEqual(p2, p1)
def test_get_next_pass(self):
date = dt.datetime.strptime("2014-10-22 20:18:11.921921", '%Y-%m-%d %H:%M:%S.%f')
pass_ = self.predictor.get_next_pass(ARG, date, max_elevation_gt=15)
for i in range(20):
pass_ = self.predictor.get_next_pass(ARG, pass_.los, max_elevation_gt=15)
self.assertGreaterEqual(pass_.max_elevation_deg, 15)
def test_get_next_pass_with_limit_exception(self):
date = dt.datetime.strptime("2014-10-22 20:18:11.921921", '%Y-%m-%d %H:%M:%S.%f')
pass_ = self.predictor.get_next_pass(ARG, date, max_elevation_gt=15)
with self.assertRaises(NotReachable):
self.predictor.get_next_pass(ARG, date, max_elevation_gt=15,
limit_date=pass_.aos - dt.timedelta(minutes=1))
def test_get_next_pass_with_limit(self):
date = dt.datetime.strptime("2014-10-22 20:18:11.921921", '%Y-%m-%d %H:%M:%S.%f')
pass_ = self.predictor.get_next_pass(ARG, date, max_elevation_gt=15)
new_pass = self.predictor.get_next_pass(
ARG, date, max_elevation_gt=15,
limit_date=pass_.los + dt.timedelta(seconds=1))
self.assertEqual(pass_, new_pass)
def test_get_next_pass_right_at_passing(self):
date = dt.datetime.strptime("2014/10/23 01:27:33.224", '%Y/%m/%d %H:%M:%S.%f')
pass_ = self.predictor.get_next_pass(ARG, date)
self.assertAlmostEqual(pass_.aos, date, delta=ONE_SECOND)
self.assertTrue(date < pass_.los)
position = self.predictor.get_position(date)
self.assertTrue(ARG.is_visible(position))
def test_get_next_pass_while_passing_gets_current(self):
date = dt.datetime.strptime("2014/10/23 01:28:00.000", '%Y/%m/%d %H:%M:%S.%f')
pass_ = self.predictor.get_next_pass(ARG, date)
self.assertTrue(pass_.aos < date < pass_.los)
def test_greater_than_deg(self):
date = dt.datetime.strptime("2014/10/23 01:25:09", '%Y/%m/%d %H:%M:%S')
pass5 = self.predictor.get_next_pass(ARG, date, aos_at_dg=5)
pass10 = self.predictor.get_next_pass(ARG, date, aos_at_dg=10)
pass12 = self.predictor.get_next_pass(ARG, date, aos_at_dg=12)
self.assertTrue(pass5.aos < pass10.aos < pass12.aos)
self.assertTrue(pass5.los > pass10.los > pass12.los)
self.assertTrue(
pass5.max_elevation_deg
== pass10.max_elevation_deg
== pass12.max_elevation_deg
)
@patch("orbit_predictor.predictors.TLEPredictor._propagate_ecef")
def test_get_position(self, mocked_propagate):
mocked_propagate.return_value = ('foo', 'bar')
when_utc = dt.datetime.utcnow()
position = self.predictor.get_position(when_utc)
self.assertIsInstance(position, Position)
self.assertEqual(when_utc, position.when_utc)
self.assertIsNone(position.error_estimate)
self.assertEqual(position.position_ecef, 'foo')
self.assertEqual(position.velocity_ecef, 'bar')
def test_off_nadir_computable_and_reasonable(self):
date = dt.datetime.strptime("2014-10-22 20:18:11.921921", '%Y-%m-%d %H:%M:%S.%f')
pass_ = self.predictor.get_next_pass(ARG, date)
self.assertLessEqual(abs(pass_.off_nadir_deg), 90)
def test_tle_predictor_is_pickleable(self):
# See https://github.com/satellogic/orbit-predictor/issues/117
with tempfile.TemporaryDirectory() as tmpdir:
pickle_file = os.path.join(tmpdir, "predictor.pkl")
with open(pickle_file, "wb") as fp:
pickle.dump(self.predictor, fp)
with open(pickle_file, "rb") as fp:
predictor = pickle.load(fp)
when_utc = dt.datetime.utcnow()
assert predictor.tle == self.predictor.tle
assert predictor.mean_motion == self.predictor.mean_motion
assert predictor.get_position(when_utc) == self.predictor.get_position(when_utc)
class OffNadirAngleTests(unittest.TestCase):
def setUp(self):
self.location = Location("A random location", latitude_deg=0, longitude_deg=0,
elevation_m=0)
def test_off_nadir_satellite_exactly_over(self):
position_ecef = llh_to_ecef(0, 0, 500 * 1000) # A satellite exactly over the point
velocity_ecef = (0, 0, 1)
max_elevation_position = Position(None, position_ecef, velocity_ecef, None)
pass_ = PredictedPass(sate_id=1, location=self.location,
aos=None, los=None, duration_s=None,
max_elevation_position=max_elevation_position,
max_elevation_deg=None)
self.assertAlmostEqual(pass_.off_nadir_deg, 0, delta=0.02)
def test_off_nadir_satellite_passing_left_means_positive_sign(self):
position_ecef = llh_to_ecef(0, -10, 500 * 1000)
velocity_ecef = (0, 0, -1)
max_elevation_position = Position(None, position_ecef, velocity_ecef, None)
pass_ = PredictedPass(sate_id=1, location=self.location,
aos=None, los=None, duration_s=None,
max_elevation_position=max_elevation_position,
max_elevation_deg=None)
self.assertGreaterEqual(pass_.off_nadir_deg, 0)
def test_off_nadir_satellite_passing_right_means_negative_sign(self):
position_ecef = llh_to_ecef(0, 10, 500 * 1000)
velocity_ecef = (0, 0, -1)
max_elevation_position = Position(None, position_ecef, velocity_ecef, None)
pass_ = PredictedPass(sate_id=1, location=self.location,
aos=None, los=None, duration_s=None,
max_elevation_position=max_elevation_position,
max_elevation_deg=None)
self.assertLessEqual(pass_.off_nadir_deg, 0)