An unambiguous detector architecture for Galileo ES signal acquisition

Abstract

Multiple peaks in autocorrelation functions of Binary Offset Carrier (BOC) modulation in the Galileo signals cause ambiguities during signal acquisition. Some techniques address this problem by compromising receiver sensitivity or acquisition time. The delay and add method addresses this problem by combining delayed versions of the correlator outputs. Types of detectors and the effect of signal filtering were not considered during the formulation of the decision statistic for that method. In this paper we analyze the effect of filtering and detector types on the unambiguous acquisition methods for Galileo E5 signals and compare the acquisition performances.