- test_gravityGradient.run(show_plots, cmOffset, planetCase, simTime)¶
Call this routine directly to run the unit test.
- test_gravityGradient.test_gravityGradientModule(show_plots, cmOffset, planetCase)¶
Validation Test Description
This test creates a spacecraft in orbit about either Earth or Venus to check if the correct gravity gradient torque is evaluated. Multiple test scenario combinations are possible where either a single or multiple gravity bodies are included, using either zero planet ephemeris for the single planet case, or using SPICE for the multi-planet scenario.
The following list discusses in detail the various test parameters used. These are test tested in all possible permutations (except show_plots of course) which is turned off for
show_plots – flag to show some simulation plots
cmOffset – center of mass offset vector in meters
integer flag with values (0,1,2,3). The cases consider the following simulation scenarios:
Case 0 indicates a simulation with only Earth present at (0,0,0).
Case 1 is a simulation with both Earth and Venus present using Spice, but the gravity gradient torque is only evaluated using Earth.
Case 2 is same as 1 but Venus is also included in the torque evaluation.
Case 3 is like 2 but here the spacecraft is orbiting venus.
Description of Variables Being Tested
The gravity effector torque output message is compared against a python evaluated vector.