Hello,

I am dealing with a phase recover& unwrap problem.

Suppose there is a temp*signal which is given by:

I = Ib + Im*cos(phi(t) + phi0);

where Ib, Im and phi0 is constant or with quite lower frequency comparing

with the phase signal: phi(t). Of coz 't' means time.

My problem is how to recover the 'phi(t)' signal.

This problem is simple if

phi(t) = omega*t;

The simplest way is utilizing Hilbert Tranform I guess.

But the signal I got is sth like:

phi(t) = omega * cos(k*t);

Frequency of the signal 'I' is then quite complicated. I have tried

Hilbert Transform and no wonder I failed.

Can anyone give some idea?

I appreciate for any advice.