A new frequency domain search strategy in high sensitivity GPS signal acquisition circuit designing

作     者：邹德岳 孟维晓 王文静 韩帅 ZOU De-yue;MENG Wei-xiao;WANG Wen-jing;HAN Shuai

作者机构：Dept.of Electronics and Information EngineeringHarbin Institute of Technology 

出 版 物：《Journal of Harbin Institute of Technology(New Series)》 (哈尔滨工业大学学报（英文版）)

年 卷 期：2012年第19卷第5期

页      面：61-66页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 081001[工学-通信与信息系统] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Sponsored by the China Aerospace Science and Technology Corporation and Harbin Institute of Technology Joint Technical Innovation Project( Grant No.CASC-HIT09) 

主　　题：GPS weak signal fast acquisition FPGA 

摘      要：The contradiction between the sensitivity and the frequency domain searching speed of GPS signal acquisition circuit has been discussed for a long time. The signal integration operation which enhances the sensitivity of the system also makes the frequency slots narrower, which affects the speed of the system. In this research a high sensitivity GPS signal acquisition circuit is implemented with a new frequency domain search strategy. The new strategy combines DDS sweep strategy with cyclic shifting sweep strategy which makes the TTFF (time to first fix) reduced evidently. The extra hardware resource cost of the new strategy is acceptable. The speed advantage of the new frequency domain search strategy has been verified by hardware comparison tests.