Title :
System design and signal processing of optimized GPS SR receiver
Author :
Lei, Zhang ; Wang Jianyu
Author_Institution :
Shanghai Inst. of Tech. Phys., Chinese Acad. of Sci., Shanghai, China
Abstract :
In this paper, a high speed 12-channel real-time software GPS receiver is proposed. Firstly, the system architecture is presented and the block data processing mechanism is introduced. The SR receiver consists of a radio frequency (RF) front end, a data acquisition board, and software that runs on a laptop with a Pentium-M 1.5GHz processor running the Window® XP operating system. The RF front end down converts the GPS signal to intermediate frequency (IF) signal and samples the IF signal at 16.368MHz. Then the optimized bit-wise algorithm is reviewed and the signal acquisition and tracking algorithm is described. The data acquisition board packs the 2-bit samples with a 2-bit in/8-bit out shift register and transfers the packed samples to laptop through a USB port. The software running on the laptop reads and processes 4 milliseconds of IF data at a time. The architecture and implementation of the SR receiver is described in this paper, including block data processing mechanism, optimized-bit wise parallel algorithm for correlation, signal acquisition, and tracking. Finally, the real-time performance of the SR receiver is also test and presented. It is shown that the software consumes about 40% Central Processing Unit (CPU) capacity when it tracking 12 satellites in real-time.
Keywords :
Global Positioning System; data acquisition; radio receivers; signal detection; telecommunication computing; user interfaces; Pentium-M processor; Window®XP operating system; bit-wise algorithm; central processing unit; data acquisition; optimized GPS SR receiver; radio frequency front end; real-time software GPS receiver; signal acquisition; signal processing; system design; tracking algorithm; Computer architecture; Data processing; Design optimization; Global Positioning System; Portable computers; RF signals; Radio frequency; Receivers; Signal processing; Strontium; GPS; acquisition and tracking; software radio;
Conference_Titel :
Computer Design and Applications (ICCDA), 2010 International Conference on
Conference_Location :
Qinhuangdao
Print_ISBN :
978-1-4244-7164-5
Electronic_ISBN :
978-1-4244-7164-5
DOI :
10.1109/ICCDA.2010.5541472