Is the step response of the discretized plant representing the satellite attitude different when we assume a D/A converter with a FOH instead of the most habitual ZOH? Why? What is the effect of sampling time now?

Question

Answer

FOH is a more sophisticated method, therefore as expected the new step response is closer to the original, continuous, one. Sampling period does not change the coincidence period after period.

Answer

In this particular system we cannot see differences but in general the FOH method guarantees the same stability for the discrete and continuous system, meanwhile the ZOH method does not.

Answer

Just the same as sampling period, for this plant using ZOH, FOH, SOH or any similar method does not change at all the behavior of the system

Answer

Discretizing with the FOH method guarantees the same response to a ramp, not to a step. Therefore we can see that the step response is different from the previous (identical period after period to the continuous one). Sampling period has the same effect, coincidence every period.

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Is the step response of the discretized plant representing the satellite attitud...

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