MSK-BCS Modulation for GNSS Radio Frequency Compatibility in C Band

Due to insufficient Radio Navigation Satellite Service (RNSS) portion of Radio Frequency (RF) spectrum for many services that are being planned for the future on L band where has come up a frequency overlapping situation, C band as an alternative spectral allocation has already been proposed in the previous years. The future C band signals could make use of the frequency band between 5010MHz and 5030MHz, offering a narrow bandwidth of 20 MHz. The main goal of C band signal design aims at having band limited signals. Consequently, it should be designed with a view to compatibility in band and the power emissions out of band. The Minimum Shift Keying(MSK) modulation is investigated to provide constant envelope and a good spectrum confinement, furthermore, a Binary Coded Symbol (BCS) modulation based on MSK pulse that has sharper autocorrelation, larger Gabor bandwidth, smaller CramérRao Lower Bound and less multipath error has been presented by Liu. Suppose spread interoperability signals employing the BCS modulation based on MSK pulse for Global Navigation Satellite System (GNSS) in C band with only a narrow bandwidth of 20MHz. Simulation results reveal the interference for the receiver prompt correlator channel processing and code tracking induced by navigation satellite system to each other. The result can be significant for the future signal design in C band.