That looks like Manchester coding starting with 14 sync bits ((0,1) or (1,0) symbol is one bit).
I'm guessing you've taken the Real (or Imaginary) component only in GnuRadio. You should be taking the magnitude of the complex value to recover the signal properly. That will get rid of the "sine curves" and give clear high/low states.
Mapping that that with the Manchester symbols gets one to a string of ones and zeros. What they mean is anybody's guess, but if you can change the state of a sensor, capture its transmission, and compare one state's transmission to another, you might be able to puzzle out the bit mapping enough to do something with it.
There is an Atmel Manchester Coding application note here that may be helpful: Application Notes | Microchip Technology.