Comparative Interference Vulnerability Assessment of GPS TMBOC and Galileo CBOC Signals

Aim of this paper is to present an interference impact assessment in the context of Global Navigation Satellite Systems (GNSS), focusing on the new modulations based on the Multiplexed Binary Offset Carrier(MBOC) scheme that will be used for modernized GPS L1C and Galileo E1 civil signals. Simulation results are presented and discussed in order to perform a comparative analysis of GPS L1C and Galileo E1 civil signals in presence of Continuous Wave(CW) interference. Performance is discussed versus the main signal and receiver parameters that could affect the interference robustness of the signals and the receiver. In detail, both double and single channel (data and/or pilot) tracking schemes have been assessed, varying the receiver bandwidth, integration time, correlator type and spacing. The obtained results show that tracking both data and pilot channels (correlating the incoming signal with coherent local replica, including both the channels), similar performance can be obtained by a receiver for GPS L1C and Galileo E1 Open Service (OS) signals. On the other hand, some differences can be noticed when the receivers take advantage of only one channel (e.g. tracking only the pilot channels), due to their different power levels and modulation formats. Some final remarks are also drawn in order to provide also some guidelines to the reader on how to reduce the interference impact on MBOC signals by means of a proper receiver setup.