Study of Direct Acquisition of GPS P-Code in Low-SNR

Author

Jian, Li ; Feng, Liu ; Teng, Long

Author_Institution

Sch. of Inf. Sci. & Technol., Beijing Inst. of Technol., Beijing

Volume

2

fYear

2008

fDate

20-22 Dec. 2008

Firstpage

249

Lastpage

253

Abstract

XFAST and average-method are two typical methods for GPS P-code acquisition in frequency domain. This study compares the performance of P-code direct acquisition using the two methods, analyzes the feasibility of direct P-code acquisition in low-SNR according to Average-Method, conducts MATLAB simulation and tries to configure a hardware realization method based on large-point FFT with fixed-point data format in FPGA. The new method can satisfy the detecting rate 90% and false alarm rate 10^-7 under -134 dBm input signal power with the lowest hardware resources compared with those of XFAST and direct FFT and shorten the acquisition time. The hardware system based on FPGA was designed and verified to be able to meet the design requirement.

Keywords

Global Positioning System; fast Fourier transforms; field programmable gate arrays; pseudonoise codes; synchronisation; FPGA; GPS P-code; MATLAB simulation; XFAST; average-method; direct acquisition; extended replica folding acquisition search technology; fixed-point data format; hardware realization method; large-point FFT; low-SNR; Analytical models; Field programmable gate arrays; Frequency domain analysis; Global Positioning System; Hardware; Information technology; MATLAB; Navigation; Performance analysis; Radar applications; average method; direct acquisition of P-code; hardware system; low-SNR;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Information Technology Application, 2008. IITA '08. Second International Symposium on

Conference_Location

Shanghai

Print_ISBN

978-0-7695-3497-8

Type

conf

DOI

10.1109/IITA.2008.349

Filename

4739765