[Discuss-gnuradio] QPSK correlator

[Андрей Родионов]

Hi community!

I’m writing a QPSK demodulator for Meteor-M satellite. I followed tutorial on 
https://wiki.gnuradio.org/index.php/Guided_Tutorial_PSK_Demodulation and got 
the bits, which I was able to parse and restore the image. However I’m using 
sync word correlator with only 4 phase ambiguities (I wrote it myself). 
According to this doc: 
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19890016010.pdf there are 
8 phase ambiguity possible. 

My question is: if there any block in gnuradio, which could resolve all 8 phase 
ambiguities?

Best Regards,
Andrey