Navigation Signal Acquisition Method Based on Multiple DBZP Fusion

Abstract

With the upcoming of modernized global positioning system (GPS) and Galileo, the new generation global navigation satellite systems (GNSS) will use signals with equal spreading code and bit periods, resulting in a potential bit sign transition in each primary code period of the received signal segments. The double block zero padding (DBZP) method and its improved versions overcome the correlation peak loss caused by bit sign transitions, but 50 % of the correlation peak energy is lost because it only uses one correlation period accumulation during two correlation time processing. To solve the problem, an acquisition method based on multiple double block zero padding fusion (MDBZPF) has been proposed to reduce the correlation loss by fusing three different DBZP strategies. The theoretical and simulated resulted show the proposed method can provide 2–3 dB acquisition sensitivity improvement compared with the DBZP method, and reduce the average acquisition time about 5–70 %.