As, we can determine the response of the system by its 'impulse response' then why we use 'step response' and 'ramp response'. Is there any difference between all these response?
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$\begingroup$ For an LTI system, you can derive any of those responses from the others, if that's what you're asking. You must know the step height, ramp shape, etc. For non-LTI systems, they might provide results that can't be derived from each other. $\endgroup$– endolithCommented Nov 17, 2015 at 14:57
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Like the impulse response, the step and ramp responses describe an LTI-system. There are situations when the step response or the ramp response describe what we want to know about the system more directly than the impulse response. When the input to a system is a piece-wise constant function of time, the transitions are well described by the step response. It gives quite directly information about overshoot and settling time.
answered Nov 17, 2015 at 15:05
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$\begingroup$ I think impulse response tells the transient response while step tells both the transient and steady-state response? but what about the ramp response? Where we need ramp response? for which situation ? any single example please? $\endgroup$ Commented Nov 17, 2015 at 15:58
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$\begingroup$ Maybe a laser cutter that cuts sheets by straight lines. So the X and Y coordinates are intended to follow ramp segments, but won't do that exactly because of inertia. $\endgroup$ Commented Nov 17, 2015 at 16:13