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AltBOC(15,10) is the baseline of COMPASS B2 signal modulation and TD-AltBOC is presented recent years. However, AltBOC modulation has drawbacks such as low multiplexing efficiency and great receiver complexity, the frequency utilization rate of TD-AltBOC is low. This paper presents a new modulation type named PS-AltBOC (Phase Shifted AltBOC) with constant envelope based on the standard AltBOC modulation...