【摘 要】
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With the upcoming of modernized global positioning system (GPS) and Galileo,the new generationglobal navigation satellite systems (GNSS) will use signals with e
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With the upcoming of modernized global positioning system (GPS) and Galileo,the new generationglobal navigation satellite systems (GNSS) will use signals with equal spreading code and bitperiods,resulting in a potential bit sign transition in each primary code period of the receivedsignal segments.The doubleblock zero padding (DBZP) method and its improved versions overcome thecorrelation 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 methodbased on multiple doubleblock zero padding fusion (MDBZPF) has been proposed to reduce thecorrelation loss by fusing three different DBZP strategies.The theoretical and simulated resultedshow the proposed method can provide 2-3 dB acquisition sensitivityimprovementcompared withthe DBZP method,and reduce the average acquisition timeabout 5%~70%.
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