Title :
Segmented matched filter with differentially coherent combined for PN code fast acquisition
Author :
Zhao, Weigang ; Kou, Yanhong ; Zhang, Qishan
Author_Institution :
Sch. of Electron. & Inf. Eng., Shijiazhuang Railway Inst., Shijiazhuang, China
Abstract :
In high dynamic environment, the PN code acquisition is one of the most challenging step in the process of DS/SS systems synchronization. Segmented matched filter (SMF) provides rapid acquisition with large frequency offset. A new scheme that differentially combine inner-symbolic sub-SMF correlation outputs and coherently accumulate over a number of consecutive symbols is proposed, and the maximum selection method is used to find the optimal aligned codephase. The theoretical derivation of probability density function of the detection variables in the proposed detector is done. Numerical simulation results with high dynamic GPS receiver show that the detection performance is tolerable to a large amount of initial frequency offset and data modulation of the DS-SS signal.
Keywords :
Global Positioning System; matched filters; probability; pseudonoise codes; radio receivers; spread spectrum communication; synchronisation; DS-SS systems; GPS receiver; PN code fast acquisition; data modulation; direct-sequence spread spectrum system; global positioning system; maximum selection method; probability density function; segmented matched filter; synchronization; Degradation; Digital filters; Discrete Fourier transforms; Diversity reception; Doppler shift; Flexible printed circuits; Frequency synchronization; Global Positioning System; Matched filters; Railway engineering; Differential coherent combined; High dynamic receivers; PN code acquisition; Segmented matched filter; Synchronization;
Conference_Titel :
Communications and Information Technology, 2009. ISCIT 2009. 9th International Symposium on
Conference_Location :
Icheon
Print_ISBN :
978-1-4244-4521-9
Electronic_ISBN :
978-1-4244-4522-6
DOI :
10.1109/ISCIT.2009.5340969