New unambiguous delay-and-multiply acquisition schemes for Galileo E1 OS signals and its performance analysis

초록

Galileo is the new European Global Navigation Satellite System (GNSS), similar to the GPS of the United States and GLONASS of Russia. Galileo- and GPS-modernized signals use the binary offset carrier (BOC) modulation to use the same frequencies for their compatibility. Galileo E1 OS (open-service) signal uses the CBOC (composite BOC) modulation, which produces the ambiguity problem in the acquisition process because of the multiple side-peaks in the correlation functions. This paper proposes new delay-and-multiply (DM) acquisition methods to eliminate the ambiguity and proves that the resulting correlation functions of the decision variables have a triangular shape as observed in the PN code of the legacy GPS L1 signal. The noise characteristics and performances of the proposed DM methods are theoretically analyzed and compared with the conventional method.

키워드