The correlation concept is introduced, the signal correlation function was defined and the correlation demodulation theory of the fiber grating sensing system was basically established.

Based on the theory of modulation and demodulation, a key technique to realize the real-time transmission of multi-path local signals has been studied, as well as according to circuit.

This paper discusses the theory and the realization approach of BOC modulation and demodulation in satellite navigation system, and focuses on the BOC code tracking technology.