''' '''
'''
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 Basilisk.utilities.pyswice_spk_utilities import spkRead
from Basilisk.topLevelModules import pyswice
from Basilisk import __path__
bskPath = __path__[0]
[docs]def planetPositionVelocity(planetName, time, ephemerisPath = '/supportData/EphemerisData/pck00010.tpc', observer = 'SSB', frame = 'J2000'):
"""
A convenience function to get planet position from spice
Parameters
----------
planetName : name of planet to get position of
planet name must be a valid SPICE celestial body string.
time : UTC time as string
ephemerisPath : a string path to ephemeris file if something other than the default is desired
observer : observer to get vectors relative to
Returns
-------
position and velocity vector of planet in Solar System Barycenter inertial frame as lists [m], [m/s]
"""
pyswice.furnsh_c(bskPath + '/supportData/EphemerisData/de430.bsp')
pyswice.furnsh_c(bskPath + '/supportData/EphemerisData/naif0012.tls') #load leap seconds
pyswice.furnsh_c(bskPath + ephemerisPath)
positionVelocity = spkRead(planetName, time, frame, observer)
position = positionVelocity[0:3] * 1000
velocity = positionVelocity[3:6] * 1000
pyswice.unload_c(bskPath + ephemerisPath)
return position, velocity # [m], [m/s]