Abstract:Aiming at the problem that C/A code acquisition of GPS software receivers has a high signal-to-noise ratio threshold and slow acquisition speed, a GPS weak signal acquisition method based on average grouping and superposition correlation is proposed. First, autocorrelation loss is reduced and weak signal acquisition is improved based on the average correlation processing technique. Second, the superposition correlation is used to improve the operational efficiency of the coherent operation, and linear interpolation is used to improve the performance of the autocorrelation function. Finally, C/A signal acquisition accuracy is improved by frequency offset correction and interpolation. Theoretical analysis and simulation experiments both verify that the proposed acquisition method can achieve GPS signal acquisition at a lower signal-to-noise ratio with higher accuracy and lower computational load.
YANG Jiudong,WU Fenghua,WANG Wenjun. GPS Signal Acquisition Method: Based on Average Grouping and Superposition Correlation[J]. jgg, 2018, 38(8): 828-831.