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.