Topical Terminology > Binary Shift-key (Bsk) Modulation
Binary Shift-Key (BSK) Modulation
For Binary Shift-Key (BSK) Modulation we have a term and definition in GPS.
Binary Shift-key (Bsk) Modulation (GPS) 
BSK is a modulation technique by which a binary message, such the Navigation Message or the PRN codes (consisting of 0's and 1's), is imprinted on the carrier wave. Unlike Amplitude Modulation (AM) and Frequency Modulation (FM), BSK Modulation does not alter the signal level (the "amplitude") or the carrier wavelength (the "frequency"). At a change in value of the message from 0 or 1, or from 1 to 0, the carrier wave is reversed (the phase is "flipped" by 180°). All reversals take place at the zero-crossings of the carrier (sine) wave (i.e., where the phase is zero).
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