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
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