Multi-correlator structures for tracking Galileo signals with CBOC and SinBOC(1,1) reference receivers and limited front-end bandwidths

Multipath is one of the paramount error sources in code tracking. Optimized Multiple Gate Delay structures have been proposed before for SinBOC(1,1)-modulated signal and infinite receiver bandwidth, in order to cope better with multipath. The new modulation, Composite Binary Offset Carrier (CBOC) modulation, used in Galileo E1 band makes it possible that either SinBOC(1,1) or CBOC reference code could be used in receiver design. In this paper, we describe the MGD optimization steps and optimized parameters for Galileo CBOC signals processed with SinBOC(1,1) and CBOC reference codes, respectively, and with limited front-end receiver bandwidth, that is usually employed in mass-market GNSS receivers. The performance of the proposed MGD structure is verified in a Galileo E1 Open Service (OS) Simulink-based software receiver. The performance evaluation criteria are based on Multipath Error Envelope (MEE) and Root Mean Square Error (RMSE) in multipath channels.