Multiple Gate Delay Tracking Structures for GNSS Signals and Their Evaluation with Simulink, SystemC, and VHDL

[摘要] Accurate delay tracking in multipath environments is one of the prerequisites of modern GNSS receivers.Several solutions have been proposed in the literature, both feedback and feedforward. However, thistopic is still under active research focus, especially for mass-market receivers, where selection of lowcomplexity,nonpatented methods is preferred. Among the most encountered delay tracking structuresimplemented in today's receivers, we have the narrow correlator and the double-delta correlators. Bothare heavily covered by various patents. The purpose of this paper is to introduce a new, generic structure,called multiple gate delay (MGD) structure, which covers also the patented correlators but offers muchmore flexibility in the design process. We show how the design parameters of such a structure can beoptimized, we argue the performance of this structure via detailed simulation results based on varioussimulators, such as Matlab/Simulink-based tool, GRANADA, and we test the implementation feasibility ofMGD structures on actual devices, via SystemC and FPGA prototyping. One of the main advantages ofthe proposed structure is its high degree of flexibility, which allows the designer to choose among, to theauthors' knowledge, nonpatented solutions with delay tracking accuracy comparable with that of thecurrent state-of-art trackers.

[学科分类] 电子、光学、磁材料