Parameters model 2 factors HJM

Hi to everyone.

I have a big problem, I hope someone can help me!

I must calibrate the parameters of the Heat-Jarrow-Morton model at 2-factors. I think I must use a minimization, but I'm very confused in particular with the Brownian motions and their correlation.

I ask to you if you can give me an idea of how approach the problem. I want know how calculate the short term volatility, the long term volatility, the mean reversion and the correlation between brownian motions for the HJM 2-factors model.

Please, help me!