Thursday 22nd of February 2018

Estimation of Time Difference of Arrival (TDOA) for the Source Radiates BPSK Signal

Hesham Ibrahim Ahmed, Ping Wei, Imran Memon, Yanshen Du and Wei Xie

Time difference of arrival (TDOA) technology has been widely used in positioning and navigation system recently. The position estimation of a source through determining time difference of arrival (TDOA) of its signal among distributed sensors has many applications in civil as well as in the military. According to civil aspect, in mobile communication is widely used TDOA to perform location of cell phones of their subscribers and mobile stations using fixed base stations and also in costal stations is used TDOA to estimate boats and ship\'s location using acoustic waves. According the military aspect, it used to locate enemy\'s emitting devices such as radars, communication devices in the battle field. In this research paper we analyse the performance of TDOA estimation for Binary phase shift keying (BPSK) signals, the whole scenario for estimating time-difference-of-arrival (TDOA) measurements was considered. The cross-correlation among arbitrary sensors is used to estimate TDOA also by exploiting the spectral characteristic of the received signals by considering the maximum likelihood generalized cross correlation (ML-GCC) the source will as unknown position emitting BPSK signal corrupted by the white Gaussian noise, The problem studied is time-difference of arrival estimation in a multipath channel. The TDOA measurement can used for solving the localization problem typically implies cross-correlating the noisy signals received at pairs of sensors deployed within reception range of the source. Correlation-based localization is severely degraded by the presence of multipath. In Simulation results show us that the proposed method for TDOA can achieve the Cramer-Rao lower bound (CRLB) accuracy compared with changing the signal-to-noise-ratio (SNR) the observation time and bandwidth (BW) of the signal and also show the good performance of accuracy of the proposed source localization methods.

Keywords: CC, ML-GCC, CRLB, time difference of arrival (TDOA), Wireless sensor network (WSN).

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Hesham Ibrahim Ahmed
I received BS electrical and electronics engineering 2009 from Engineering College, Karary University Omdurman Khartoum Sudan Ms signal and information processing from university of electronic science and technology of China (UESTC) Chengdu Sichuan China research interests random signal processing and Radar signal processing.

Ping Wei
He received B.S. and M.S. degrees both in the electronic engineering from Beijing Institute of Technology in 1986 and 1989, respectively. He received PhD degree in communication and electronic system from the University of Electronic Science and Technology of China (UESTC) in 1996. He is now a professor in the School of Electronic Engineering of UESTC. His research interests include spectral analysis, array signal processing and communication signal processing. Prof. Wei is a senior member of CIE and a member of IEEE.

Imran Memon
I received BS electronics 2008 from IICT University of Sindh Jamshoro Sindh Pakistan. Ms Computer Engineering from university of electronic science and technology Chengdu Sichuan china. I got Academic Achievement award 2011-2012 from UESTC china and also got Excellent performance Award 2011-2012 from UESTC china ,published more than three international conference papers and 4 journal papers ,current research interests; Artificial intelligence system ,network security, Embedded system, information security.

Yanshen Du
I received BS electronic science and technology 2009 from Southwest University Chongqing China now I am doing PhD at university of electronic science and technology of China (UESTC) Chengdu Sichuan China. I got academic outstanding awards 2010 and 2011 respectively from (UESTC) China. My research interests are passive localization and signal processing.

Wei Xie
I received BS electronic science and technology 2011 from Yantai University Yantai China now I am doing PhD at university of electronic science and technology of China (UESTC) Chengdu Sichuan China. My research interests are sparse signal reconstruction and array signal processing.

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