High-resolution digital beamforming of UWB signals based on Carathéodory representation for delay compensation and array extrapolation

doi:10.21629/JSEE.2018.05.04

Journal of Systems Engineering and Electronics ›› 2018, Vol. 29 ›› Issue (5): 918-926.doi: 10.21629/JSEE.2018.05.04

• Electronics Technology • Previous Articles Next Articles

High-resolution digital beamforming of UWB signals based on Carathéodory representation for delay compensation and array extrapolation

Qiang DU(), Yaoliang SONG*(), Chenhe JI(), Zeeshan AHMAD()

School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Received:2016-08-11 Online:2018-10-26 Published:2018-11-14
Contact: Yaoliang SONG E-mail:qdu1023@gmail.com;ylsong@mail.njust.edu.cn;princekevin1984@163.com;dr.zeeshan@njust.edu.com
About author:DU Qiang was born in 1985. He received his B.S. degree from School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China, in 2007, and currently he is working towards his Ph.D. degree at School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China. His interests include array signal processing and ultra wideband (UWB) signal processing. E-mail: qdu1023@gmail.com|SONG Yaoliang was born in 1960. He received his B.Eng., M.Eng. and D.Eng. degrees in electrical engineering from Nanjing University of Science and Technology, China, in 1983, 1986, and 2000 respectively. He had been a researcher fellow at the Department of Engineering Science at the University of Oxford from 2004 to 2005. Presently, he is a professor at Nanjing University of Science and Technology, and is heading the UWB Radar Imaging Group. His major research interests are UWB communications, UWB radar imaging, and advanced signal processing. E-mail: ylsong@mail.njust.edu.cn|JI Chenhe was born in 1984. He received his B.S. degree from School of Electronic and Optical Engineering from Nanjing University of Science and Technology, China, in 2006. Now he is purchasing his Ph.D. degree at School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China. His research interests are waveform design and signal processing of MIMO radar. E-mail: princekevin1984@163.com|AHMAD Zeeshan was born in 1988. He received his B.E. degree in electrical (telecom) engineering from Bahria University Islamabad, Pakistan, in 2011 and M.E. degree in electronics and communication engineering from Chongqing University, Chongqing, China, in 2014. Currently, he is enrolled in Nanjing University of Science & Technology, Nanjing, Jiangsu Province, China as a Ph.D. student. His research interests include array signal processing, ultra wideband, wideband and narrowband beamforming, radar, adaptive arrays, GPS and satellite navigation systems. E-mail: dr.zeeshan@njust.edu.com
Supported by:
the National Natural Science Foundation of China(61271331);the National Natural Science Foundation of China(61571229);This work was supported by the National Natural Science Foundation of China (61271331; 61571229)

Abstract

Abstract:

To realize high-resolution digital beamforming (DBF) of ultra-wideband (UWB) signals, we propose a DBF method based on Caratheodory representation for delay compensation ′ and array extrapolation. Delay compensation by Caratheodory ′ representation could achieve high interpolation accuracy while using the single channel sampling technique. Array extrapolation by Caratheodory representation reformulates and extends each ′ snapshot, consequently extends the aperture of the original uniform linear array (ULA) by several times and provides a better realtime performance than the existing aperture extrapolation utilizing vector extrapolation based on the two dimensional autoregressive (2-D AR) model. The UWB linear frequency modulated (LFM) signal is used for simulation analysis. Simulation results demonstrate that the proposed method is featured by a much higher spatial resolution than traditional DBF methods and lower sidelobes than using Lagrange fractional filters.

Key words: beamforming, ultra-wideband (UWB), array extrapolation, Caratheodory representation, fractional delay

Qiang DU, Yaoliang SONG, Chenhe JI, Zeeshan AHMAD. High-resolution digital beamforming of UWB signals based on Carathéodory representation for delay compensation and array extrapolation[J]. Journal of Systems Engineering and Electronics, 2018, 29(5): 918-926.

Figures/Tables 12

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Simulation parameter	Value
Data size	2L + 1 = 11, N = 500
Source	DOA=1, SNR=20 dB DOA=8, SNR=20 dB
Extrapolation factor	α = 5

Simulation parameter	Value
Data size	2L + 1 = 11, N = 500
Source	DOA=1, SNR=10 dB DOA=8, SNR=25 dB
Extrapolation factor	α = 5

Simulation parameter	Value
Data size	2L + 1 = 11, N = 500
Source	DOA=5, SNR=25 dB DOA=12, SNR=10 dB
Extrapolation factor	α = 5

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High-resolution digital beamforming of UWB signals based on Carathéodory representation for delay compensation and array extrapolation

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