Title :
Design of high sensitivity GPS signal acquisition circuit with new frequency domain search strategy
Author :
Zou, Deyue ; Wang, Wenjing ; Han, Shuai ; Meng, Weixiao
Author_Institution :
Dept. of Electron. & Inf. Eng., Harbin Inst. of Technol., Harbin, China
Abstract :
In this paper a GPS signal acquisition circuit is designed based on FPGA and a new GPS signal frequency domain search strategy is proposed and implemented by combining the cyclic shift sweep and DDS sweep. The system frequency domain search speed is improved evidently. And TTFF (time to first fix) can be extremely reduced, with out to much extra hardware costs. As a result, the weak signal acquisition and fast acquisition could be achieved simultaneously. Through hardware testing the sensitivity of the system and the advantages of the new strategy in the search speed is validated.
Keywords :
Global Positioning System; field programmable gate arrays; frequency-domain analysis; logic design; signal detection; DDS sweep; FPGA; cyclic shift sweep; hardware testing; high sensitivity GPS signal acquisition circuit design; system frequency domain search speed strategy; weak signal acquisition; Correlation; Global Positioning System; Hardware; Search problems; Signal resolution; Time frequency analysis; FPGA; GPS; fast acquisition; weak signal;
Conference_Titel :
Communications and Networking in China (CHINACOM), 2011 6th International ICST Conference on
Conference_Location :
Harbin
Print_ISBN :
978-1-4577-0100-9
DOI :
10.1109/ChinaCom.2011.6158288
