Weak GPS signal acquisition method based on DBZP

doi:10.21629/JSEE.2018.02.03

Journal of Systems Engineering and Electronics ›› 2018, Vol. 29 ›› Issue (2): 236-243.doi: 10.21629/JSEE.2018.02.03

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Weak GPS signal acquisition method based on DBZP

Jianing WANG^1,*(), Baowang LIAN¹(), Zhe XUE²()

¹ School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
² Xi'an Modern Control Technology Research Institute, Xi'an 710065, China

Received:2017-02-28 Online:2018-04-26 Published:2018-04-27
Contact: Jianing WANG E-mail:nswonderland@outlook.com;bwlian@nwpu.edu.cn;xuezhenwpu@163.com
About author:WANG Jianing was born in 1983. He is currently pursuing his Ph.D. degree in School of Electronics and Information, Northwestern Polytechnical University. His research interests are spread spectrum and satellite communication. E-mail: nswonderland@outlook.com|LIAN Baowang was born in 1962. He received his Ph.D. degree in communication and information system from Northwestern Polytechnical University in 2006. Since 1999, he has been a professor at Northwestern Polytechnical University. His main research interests are satellite communication, navigation and signal processing. E-mail: bwlian@nwpu.edu.cn|XUE Zhe was born in 1983. She is currently an engineer at Xi'an Modern Control Technology Research Institute. She received her B.E. and M.S. degrees from Northwestern Polytechnical University in 2008 and 2011, respectively. Her research interest lies in communication signal processing. E-mail: xuezhenwpu@163.com
Supported by:
the National Natural Science Foundation of China(61771393);This work was supported by the National Natural Science Foundation of China (61771393)

Abstract

Abstract:

Double block zero padding (DBZP) is a widely used but costly method for weak global positioning system (GPS) signal acquisition in software receivers. To improve the computational efficiency, this paper proposes an algorithm based on the differential DBZP algorithm and the discrete cosine transform (DCT) domain filtering method. The proposed method involves using a differential correlator after the DBZP operation. Subsequently, DCT domain low pass filtering (LPF) and inverse DCT (IDCT) reconstruction are carried out to improve the signal to noise ratio (SNR). The theoretical analysis and simulation results show that the detection algorithm can effectively improve the SNR of the acquired signal and increase the probability of detection under the same false alarm probability.

Key words: global positioning system (GPS), double block zero padding (DBZP), discrete cosine transform (DCT), differential coherent combing

Jianing WANG, Baowang LIAN, Zhe XUE. Weak GPS signal acquisition method based on DBZP[J]. Journal of Systems Engineering and Electronics, 2018, 29(2): 236-243.

Figures/Tables 6

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References 17

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Calcula tion cost	DBZP-DCC	FMDBZP	Proposed
ZFFT	0	$2^{(N_{db} -1)}N_{be} N_{ms} $	0
Storage	$N_{{{{\rm{step}}}}} N_{ms} N $	$2^{(N_{db} -1)}N_{be}N_{{{{\rm{step}}}}} N_{ms} N $	$ N_{{{{\rm{step}}}}} N_{ms} N $
DCT	0	0	$ 2N_{ms} $

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Weak GPS signal acquisition method based on DBZP

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