#
# ISC License
#
# Copyright (c) 2016, Autonomous Vehicle Systems Lab, University of Colorado at Boulder
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
from pathlib import Path
from Basilisk import __path__
from Basilisk.topLevelModules import pyswice
from Basilisk.utilities.pyswice_spk_utilities import spkRead
from Basilisk.utilities.supportDataTools.dataFetcher import get_path, DataFile
bskPath = __path__[0]
[docs]
def planetPositionVelocity(
planetName,
time,
ephemerisPath="/supportData/EphemerisData/pck00010.tpc",
observer="SSB",
frame="J2000",
):
"""
Convenience function to get planet position from SPICE.
"""
from Basilisk.utilities.supportDataTools.dataFetcher import get_path, DataFile
from pathlib import Path
from Basilisk.topLevelModules import pyswice
from Basilisk.utilities.pyswice_spk_utilities import spkRead
# --- Resolve kernel paths ---
de430_path = Path(get_path(DataFile.EphemerisData.de430))
naif0012_path = Path(get_path(DataFile.EphemerisData.naif0012))
print("\n==== planetPositionVelocity DEBUG ====")
print("planetName:", planetName)
print("time:", time)
print("ephemerisPath:", ephemerisPath)
print("de430_path:", de430_path)
print("naif0012_path:", naif0012_path)
# --- Load global kernels ---
pyswice.furnsh_c(str(de430_path))
pyswice.furnsh_c(str(naif0012_path))
# --- Resolve ephemeris path ---
eph = Path(ephemerisPath)
if eph.is_dir():
# historical Basilisk behavior:
# when passed a directory, only load pck00010.tpc
candidate = eph / "pck00010.tpc"
if not candidate.exists():
raise RuntimeError(
f"Directory {eph} does not contain pck00010.tpc "
"(required for old-style planetPositionVelocity)"
)
eph = candidate
# Load ephemeris file
pyswice.furnsh_c(str(eph))
positionVelocity = spkRead(planetName, time, frame, observer)
position = positionVelocity[0:3] * 1000
velocity = positionVelocity[3:6] * 1000
# Unload only the ephemeris file we loaded
pyswice.unload_c(str(eph))
return position, velocity