FPGA Implementation of GPS - L5 Adaptive Acquisition

摘要

This paper deals with the implementation of an adaptive acquisition stage in a globalnavigation satellite - GNSS - receiver with a pilot and data channel in case of GNSS L5 signal.Adaptive acquisition decides on GNSS signal presence or absence by comparing a cell undertest with an adaptive threshold and provides a code delay and Doppler frequency estimation.Firstly, we introduce an adaptive acquisition with a cell- averaging-constant false alarm rate -CFAR- for pilot channel then we propose a data-pilot fusion. At a second level, the proposedschemes are implemented on FPGA by using system generator and Xilinx tools.Theobtainedresults are summarized in the resource tables, which show that our implementation is feasibleon the selected FPGA card.