公开(公告)号：US20230111314A1

公开(公告)日：2023-04-13

申请号：US16958019

申请日：2019-11-13

申请人： SHAN DONG UNIVERSITY

发明人： Juanjuan SUN ,  Mengqi CHEN ,  Xuezheng HUANG ,  Yong WANG ,  Xing WANG ,  Zihan WU

IPC分类号： G01S19/30 ,  G01S19/29

摘要： A GNSS signal acquisition method based on FPGA step-by-step code phase refinement comprises steps as follows: (1) Coarse acquisition: correlate all received data with the locally generated carrier and the complete pseudo-random code to find the maximum correlation value; obtain the carrier and the rough code phase for fine acquisition if the maximum correlation value conforms to the acquisition threshold; otherwise, repeat Step (1). (2) Fine acquisition: feedback the carrier and the coarse acquisition code phase value from Step (1) to the controller so that the controller can intercept partial of the received signal for mixing with the local carrier from Step (1); then, correlate the result with partial pseudo-random code after eliminating the influence of the carrier to obtain a code phase with higher accuracy.