System identification only using sine input? Recently, I'm working on modeling a sensor's system model using system identification. 

Subject to the experiment condition, I only have the sine input signal. In addition, the frequency can not continuous change. In other words, I only have some specific frequencies experiment data.

I'm new about system identification, but clearly this kind of signal can not let the system show all of the feature. So, is there any algorithm can get the system model only using sine input signal?

Thanks a lot.
Knowing the amplitude (and phase) for several frequencies allows you to fit a model with as many parameters, hoping the system is linear.

With little information you cannot observe the whole system behavior accurately, but just a simplified model. This might be enough for your purpose.

Knowing the internal system structure should help you select an empirical model.