Cross-correlation interference-free tiered polyphase codes for GNSS signal design

A new type of tiered code for designing the ranging signal structure of global navigation satellite systems (GNSSs) is proposed. The proposed tiered code structure combines a constant amplitude zero autocorrelation polyphase secondary code with its primary code, resulting in a tiered polyphase code (TPC) that avoids cross-correlation interference between different ranging codes. The analysis and the simulation results show the performance of the proposed TPC and confirm its effectiveness as a ranging signal structure for the GNSSs.