Analysis of intrasystem and intersystem interference of Navigation systems with Interplex modulation in the L1 band

摘要

The modernization of GPS and the Galileo system adopt the Interplex modulation to transmit multiple signals on one carrier, Interplex modulation is a particular constant envelope phase modulation through induce the intermodulation (IM) term. The main objective of this paper is to analyze the IM term effect degrees of interference that GPS and Galileo signals are expected to have in the L1 band. This paper extends the interference assessing methodologies to be applicable in the situation that accounting for IM term effects, and applies to analyze the impacts of Galileo IM term and the impacts of three versions IM term signal of GPS. Numerical results show that different nonlinear mechanism of Interplex modulation induce different degrees of interference, and the desired signals having different modulation models exhibit different degrees of sensitivities to the IM term interference effects.