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line_of_sight_test.py
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line_of_sight_test.py
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"""Tests to check line of sight computations."""
import sys
sys.path.append("../..")
from paseos import SpacecraftActor, ActorBuilder, GroundstationActor
from paseos.central_body.is_in_line_of_sight import is_in_line_of_sight
import pykep as pk
from test_utils import get_default_instance
def test_los_between_sats():
"""create satellites where sat1 and 2 are in sight of each other (as well as sat 1 and 3)
but sat 2 and 3 are on opposite sides of the planet"""
_, sat1, earth = get_default_instance()
sat2 = ActorBuilder.get_actor_scaffold("sat2", SpacecraftActor, pk.epoch(0))
ActorBuilder.set_orbit(sat2, [0, 10000000, 0], [0, 0, 8000.0], pk.epoch(0), earth)
sat3 = ActorBuilder.get_actor_scaffold("sat3", SpacecraftActor, pk.epoch(0))
ActorBuilder.set_orbit(sat3, [0, -10000000, 0], [0, 0, -8000.0], pk.epoch(0), earth)
# check that LOS is correct
assert sat1.is_in_line_of_sight(sat2, pk.epoch(0))
assert sat1.is_in_line_of_sight(sat3, pk.epoch(0))
assert not sat2.is_in_line_of_sight(sat3, pk.epoch(0))
# also check the backend function directly
# also check reverse case (should be same)
assert is_in_line_of_sight(sat1, sat2, pk.epoch(0))
assert is_in_line_of_sight(sat2, sat1, pk.epoch(0))
assert is_in_line_of_sight(sat1, sat3, pk.epoch(0))
assert is_in_line_of_sight(sat3, sat1, pk.epoch(0))
assert not is_in_line_of_sight(sat2, sat3, pk.epoch(0))
assert not is_in_line_of_sight(sat3, sat2, pk.epoch(0))
def test_los_sat_to_ground_station_equatorial():
"""Equatorial ground station and orbit"""
t = pk.epoch(0)
ground_station = GroundstationActor("gs", t)
# Put GS at lat long 0 , 0 with elevation 0m
ActorBuilder.set_ground_station_location(ground_station, 0, 0, 0)
_, sat1, earth = get_default_instance()
# Put the sat over the equator
# Velocity 0, so it's angle to Earth doesn't change, only ground station
# movement due to Earth's rotation will impact visibility short-term this way
ActorBuilder.set_orbit(sat1, [10000000, 0, 0], [0, 0, 0], t, earth)
# Not in vision initially.
assert not ground_station.is_in_line_of_sight(sat1, t, 30.0)
# But after 0.7 days
assert ground_station.is_in_line_of_sight(sat1, pk.epoch(0.7), 65.0)
# Put the sat over the equator, higher up
ActorBuilder.set_orbit(sat1, [100000000, 0, 0], [0, 0, 0], t, earth)
# Not in vision initially.
assert not ground_station.is_in_line_of_sight(sat1, t, 30.0)
# But after 0.7 days
assert ground_station.is_in_line_of_sight(sat1, pk.epoch(0.7), 80.0)
def test_los_sat_to_ground_station_polar():
"""Satellite above the north pole, ground station on the equator and vice versa"""
t = pk.epoch(0)
ground_station = GroundstationActor("gs", t)
# Put GS at lat long 0 , 0 with elevation 0m
ActorBuilder.set_ground_station_location(ground_station, 0, 0, 0)
_, sat1, earth = get_default_instance()
# Put the sat over the north pole
# Velocity 0, so it's angle to Earth doesn't change, only ground station
# movement due to Earth's rotation will impact visibility short-term this way
ActorBuilder.set_orbit(sat1, [0, 0, 10000000], [0, 0, 0], t, earth)
# Not in vision at this height
assert not ground_station.is_in_line_of_sight(sat1, t, 0.1)
# Even after 0.7 days
assert not ground_station.is_in_line_of_sight(sat1, pk.epoch(0.7), 0.1)
# Put GS at Norht Pole lat 90 long 0 , 0 with elevation 0m
ActorBuilder.set_ground_station_location(ground_station, 90, 0, 0)
# Always vision now (almost 90deg)
assert ground_station.is_in_line_of_sight(sat1, t, 89.0)
# Even after 0.7 days
assert ground_station.is_in_line_of_sight(sat1, pk.epoch(0.7), 89.0)
# Put the sat over the equator, GS remains at north pole
ActorBuilder.set_orbit(sat1, [0, 10000000, 0], [0, 0, 0], t, earth)
# Never vision now
assert not ground_station.is_in_line_of_sight(sat1, t, 0.1)
# Even after 0.7 days
assert not ground_station.is_in_line_of_sight(sat1, pk.epoch(0.7), 0.1)
def test_los_sat_to_ground_station_elevation():
"""Testing how elevation of ground station affects angle"""
t = pk.epoch(0)
ground_station = GroundstationActor("gs", t)
# Start with GS at lat long 10 / 30 , 0 with elevation 0m
ActorBuilder.set_ground_station_location(ground_station, 10, 30, 0)
_, sat1, earth = get_default_instance()
# Put the sat over the equator
# Velocity 0, so it's angle to Earth doesn't change, only ground station
# movement due to Earth's rotation will impact visibility short-term this way
ActorBuilder.set_orbit(sat1, [100000000, 0, 0], [0, 0, 0], t, earth)
# Not in vision at this height initially
assert not ground_station.is_in_line_of_sight(sat1, t, 0.1)
# But after 0.6 days at angle > 68.2
assert ground_station.is_in_line_of_sight(sat1, pk.epoch(0.6), 68.2)
# Start with GS at lat long 10 / 30 , 0 with elevation 10000m
ActorBuilder.set_ground_station_location(ground_station, 10, 30, 10000)
# Not in vision at this height initially
assert not ground_station.is_in_line_of_sight(sat1, t, 0.1)
# Still not at this height!
assert not ground_station.is_in_line_of_sight(sat1, pk.epoch(0.6), 68.2)
if __name__ == "__main__":
test_los_between_sats()
test_los_sat_to_ground_station_equatorial()
test_los_sat_to_ground_station_polar()
test_los_sat_to_ground_station_elevation()