Re: Phase difference measurement under noise (How-to?)

[Fabian Schwartau]

Hi,
one thing came to my mind: Don't average the phase, average the complex 
value instead. If you have a lot of noise, the phase will jump around 
and will also wrap around 2*pi, which will "confuse" the averaging. 
After averaging the complex value, convert it to the phase and you are done.

Fabian

Am 12.10.21 um 15:53 schrieb mehtap özkan:
> Dear All,
>   I try to measure the phase difference between a delayed signal and a 
> reference one. I use the following blocks:
> Multiply conjugate block (Inputs are the delayed and reference signals)
> Complex to Arg
> Moving Average
> The flowgraph works good when there is no noise. However when I add 
> noise the variations are pretty wild.
>
> These blocks constitute the basic structure of a PLL's phase comparator 
> which should work under noisy Input conditions.
> What am I doing wrong?