# Find “base” frequency of pulse wave

I have some samples that are read from a square pulse wave and I'm looking for a way to find the characteristics of this wave.

It's a pulse wave, let $T_1$ be the non-pulse duration and $T_2$ to be the pulse duration, usually $T_1$ is bigger than $T_2$.

I would like to know the base frequency, e.g., the frequency that includes $T_1+T_2$. Can I do this using an FFT?