Analyzing Simulation Results

Data generated and logged (see Logging Data) during a SADYCOS simulation are made available to the user for further analysis. As of now, SADYCOS does not provide any new tools for data analysis but enables the user to utilize MATLAB’s and Simulink’s built-in capabilities.

Page Contents

• During Simulation
• After Simulation

During Simulation

Simulink provides the Simulation Data Inspector to visualize signals marked for logging in real time during a simulation. It can be opened either by executing the following command in MATLAB’s command window before starting the simulation:

Simulink.sdi.view;

or by clicking the Simulation Data Inspector button in the Simulink toolstrip. The latter option is also available after a simulation has been started.

After Simulation

After the simulation has finished, the logged data is available in the property simulation_outputs of the configuration class instantiation as a Simulink.SimulationOutput object (or an array of those for multiple simulations). If o is such an instantiation and its run method has already been called, then the following command returns the logged data of the GNC Algorithms subsystem and opens the Simulation Data Inspector for visualization:

logGnc = getElement(o.simulation_outputs.logsout, "LogGncAlgorithms");
logGnc.plot;

The outputs also allow for further analysis and manipulation. E.g., the GNC Algorithms subsystem function of the configuration class DefaultConfiguration within the ExampleMission namespace logs the error of the angular velocity vector. Its norm can be calculated and plotted with the following code:

logGnc = getElement(o.simulation_outputs.logsout, "LogGncAlgorithms");
errorNorm = vecnorm(logGnc.Values.angular_velocity_error_RB_B.Data, 2, 2);
figure;
plot(logGnc.Values.angular_velocity_error_RB_B.Time, errorNorm);
xlabel("Time [s]");
ylabel("Error Norm [rad/s]");
title("Error Norm of Angular Velocity Vector");