Multipath performance of dual estimate technology for band-limited BOC signals

• 1、Department of Electronic and Engineering,Tinghua University, Beijing 100084

Abstract：For the design of navigation receivers in hardware source and signal bandwidth limited conditions, the multipath performance of two subcarrier tracking methods, which are SPLL and SDLL, is analyzed and compared in band-limited signal conditions, and the subcarrier tracking methods are parts of dual estimate technology. To overcome the problems of traditional multipath analysis methods, which must do blind search on multiple conditions, have high complexity and hard to get general conclusion, a novel multipath analysis method is proposed. In the proposed method, the multipath error models are provided in Fourier series form, based on which, the signal bandwidth is equivalent to harmonic numbers, which can significantly reduce the analysis complexity, and general conclusions can be got based on math expressions directly. The research shows that whether the bandwidth contains the harmonic of subcarrier frequency is the key factor that determines the multipath performances, SPLL have similar multipath performance with SDLL when the signal bandwidth contains only the base frequency of subcarrier, SDLL can provide better performance when the signal bandwidth contains the third and higher harmonic of subcarrier. The conclusion can be reference for navigation receiver design.

Keywords： multipath distance measurement signal bandwidth dual estimate technology multipath performance