A novel acquisition scheme for Galileo E1 OS signals

Abstract

CBOC is the final choice of Galileo E1 OS signal. It is a result of multiplexing BOC(6,1) with BOC(1,1). It has a main drawback that is the autocorrelation function has multiple side-peaks, which will lead to ambiguous acquisition. In this paper we propose a novel method to accomplish unambiguous acquisition. The acquisition scheme is first described, and the mathematical model is introduced. Finally, the performance of this method is analyzed. This method shows very good and interesting results, cancelling the side peaks of the autocorrelation function completely and decreasing the total acquisition time especially in the case the Doppler frequency step is very small.