Hello,
I understand that you are getting a different trajectory in the same model while using two different blocks. This is because the Spacecraft Dynamics and Orbit Propagator block have a few slight differences in how they calculate the trajectory.
The Orbital Propagator treats the spacecraft as a point mass, solving only translational motion using Keplerian mechanics, resulting in a smooth trajectory. In contrast, the Spacecraft Dynamics block solves both translational and rotational motion, meaning small attitude changes or numerical integration differences can affect the trajectory. If attitude is not fixed, even without external torques, rotational coupling can introduce slight deviations.
Ensuring that both blocks use the same solver settings may also help reduce discrepancies.
Refer to the following links to check out the differences in working of the two block -
- https://www.mathworks.com/matlabcentral/answers/2138017-how-does-the-spacecraft-dynamics-block-work#answer_1486862
- https://www.mathworks.com/help/aeroblks/orbit-pop-algorithms.html
Hope this helps!
