Source code for test_keplerianOrbit


# ISC License
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# Copyright (c) 2016, Autonomous Vehicle Systems Lab, University of Colorado at Boulder
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#
# Keplerian OrbitUnit Test
#
# Purpose:  Tests an object-oriented Keplerian Orbit Object
# Author:   Scott Carnahan
# Creation Date:  Sept 10 2019
#

import inspect
import os
from copy import copy

import numpy as np
from Basilisk.architecture import keplerianOrbit
from Basilisk.utilities import orbitalMotion

filename = inspect.getframeinfo(inspect.currentframe()).filename
path = os.path.dirname(os.path.abspath(filename))

[docs] def test_unitKeplerianOrbit(show_plots=False): """Module Unit Test""" [testResults, testMessage] = unitKeplerianOrbit(show_plots) assert testResults < 1, testMessage
[docs] def unitKeplerianOrbit(show_plots=False): """ Unit Test Keplerian Orbit object This test covers: 1) elem to rv conversion 2) orbit energy calculation 3) orbital period calculation 4) mean motion calculation 5) changing individual orbital elements 6) copy constructor 7) constructor with arguments 8) constructor without arguments Parameters ---------- show_plots : bool unused. required for Basilisk test suite Returns ------- testFailCount : int number of tests that failed testMessages : str a string of all of the failure messages """ testFailCount = 0 testMessages = [] # constructor without arguments orb = keplerianOrbit.KeplerianOrbit() assert orb.a() == 100000000. if not orb.a() == 100000000.: testFailCount += 1 testMessages.append('default constructor failure') # constructor with arguments oe = orb.oe() orb2 = keplerianOrbit.KeplerianOrbit(oe, orbitalMotion.MU_EARTH) assert orb2.r_BP_P() == orb.r_BP_P() if not orb2.r_BP_P() == orb.r_BP_P(): testFailCount += 1 testMessages.append('Argumented constructor failure') # copy constructor orb3 = keplerianOrbit.KeplerianOrbit(orb2) assert orb2.v_BP_P() == orb3.v_BP_P() if not orb2.v_BP_P() == orb3.v_BP_P(): testFailCount += 1 testMessages.append('Copy Constructor Failure') try: orb4 = copy(orb3) except: assert False testFailCount += 1 testMessages.append('python copy not working') # changing orbital elements orb3.set_f(0.0) init_r = orb3.r() orb3.set_f(1.) assert init_r != orb3.r() if init_r == orb3.r(): testFailCount += 1 testMessages.append('Failure to change element') orb3.set_f(0.0) assert init_r == orb3.r() if init_r != orb3.r(): testFailCount += 1 testMessages.append('Failure to change element') # mean motion calc expected_n = np.sqrt(orbitalMotion.MU_EARTH / orb3.a()**3) assert orb3.n() == expected_n if not orb3.n() == expected_n: testFailCount += 1 testMessages.append('Bad mean motion calc') # orbital period calc assert orb3.P() == 2 * np.pi / expected_n if not orb3.P() == 2 * np.pi / expected_n: testFailCount += 1 testMessages.append('Bad period calc') # orbital energy calc expected_E = -orbitalMotion.MU_EARTH / 2.0 / orb3.a() assert orb3.Energy() == expected_E if not orb3.Energy() == expected_E: testFailCount += 1 testMessages.append('Bad energy calc') # rv calc expected_r, expected_v = orbitalMotion.elem2rv(orbitalMotion.MU_EARTH, orb3.oe()) dist = np.linalg.norm(np.array(orb3.r_BP_P()).flatten() - expected_r) assert dist == 0.0 if not dist == 0.0: testFailCount += 1 testMessages.append('RV conversion failure') return [testFailCount, ''.join(testMessages)]
if __name__ == "__main__": unitKeplerianOrbit()