Study and Analysis on Binary Offset Carrier (BOC) Modulation in Satellite Navigation Systems

The navigation signals being used in present and future Navigation Satellite System are studied in this paper. Traditional Global Position System (GPS) is using Binary Phase shift keying (BPSK) modulation with conventional rectangular (non return to zero) spreading symbols. Modernized GPS system will be making use of new modulation technique called Binary Offset Carrier (BOC) modulation that is better modulation design for next-generation radio navigation systems. Different types of BOC signals are studied and their advantages over compared with conventional PSK modulations. The autocorrelation function (ACF) and the power spectral density (PSD) characteristics of all navigation signals and all modulations are discussed. Generation of variant of BOC signals with sine sub-carrier and cosine sub-carrier are simulated by using MATLAB.