I am modelling a 2D impulsive guidance system for a spacecraft. The impulses (finite and instantaneous increments in the Velocity of the spacecraft) are added to the current (2D)state of the spacecraft and fed into the ODE block (where the dx/dt is generated). This signal is then integrated and fed back. This can be seen in the following figure.
The deltaV signal that is seen in the figure is only different than (0,0) in those epochs where the manoeuvre occurs (see figure below for the deltaVx).
This signal should produce differences in the state vector´s velocity components THAT SHOULD BE INTEGRATED, right? Well, it doesn´t. For some reason I dont manage to grasp, the integrator ignores these sudden changes in speed and keeps integrating the past velocity ("past" means non-updated value). This is shown in the two following figures (Vx component, relate them to the architecture shown in Figure 1).
What these plot show is that the deltaV is correctly added by the Matlab function, but these velocity changes are never considered by the integrator. The next step velocity is NEVER calculated as the integrate(updated V0), but as integrate(non-updated V0).
My guess is that I am missing some basic Integrator block behaviour w.r.t. (sudden?) state0 changes between steps. I have tried different integration schemes, and tuning simulation parameters, but this doesn't work either.
I would appreciate any suggestions! Thank you very much.
NOTE: The "Dynamics" block has been verified and validated already, there is no "coding" error in it. NOTE2: The Command plot shows an increasingly high deltaV command because the corrections never occur in the model, so the required command grows gradually while approaching target. NOTE3: I am using Matlab 2016b.
