Multiple interferences suppression with space-polarization null-decoupling for polarimetric array

doi:10.23919/JSEE.2021.000006

Journal of Systems Engineering and Electronics ›› 2021, Vol. 32 ›› Issue (1): 44-52.doi: 10.23919/JSEE.2021.000006

• DEFENCE ELECTRONICS TECHNOLOGY • Previous Articles Next Articles

Multiple interferences suppression with space-polarization null-decoupling for polarimetric array

Yawei LU(), Jiazhi MA(), Longfei SHI*(), Yuan QUAN()

¹ State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System, College of Electronic Science, National University of Defense Technology, Changsha 410073, China

Received:2020-04-21 Online:2021-02-25 Published:2021-02-25
Contact: Longfei SHI E-mail:luyaweivivi@163.com;jzmanudt@163.com;longfei_shi@sina.com;quanyuan18@nudt.edu.cn
About author:|LU Yawei was born in 1997. She received her B.E. degree in communication engineering from Xidian University, Xi’an, China, in 2018. She is currently pursuing her M.E. degree from National University of Defense Technology. Her interests include radar signal processing and radar polarimetry. E-mail: luyaweivivi@163.com||MA Jiazhi was born in 1987. He received his B.E. and M.E. degrees in control engineering from the Aviation University, Changchun, China, in 2010 and 2013, respectively. He is currently pursuing his Ph.D. degree from National University of Defense Technology. His interests include radar signal processing and radar polarimetry. E-mail: jzmanudt@163.com||SHI Longfei was born in 1978. He received his B.E. and Ph.D. degrees in electronic engineering from National University of Defense Technology (NUDT), Changsha, China, in 2002 and 2007, respectively. He is an associate professor at NUDT. His current research interests include digital signal processing and radar polarimetry. E-mail: longfei_shi@sina.com||QUAN Yuan was born in 1996. He received his B.S. degree in electronic information engineering from Beijing Institute of Technology, Beijing, China in 2018. Currently, he is pursuing his M.S. degree from National University of Defense Technology. His research interests include radar signal processing, waveform design and joint radar-communications. E-mail: quanyuan18@nudt.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (61901496; 61871385)

Abstract

Abstract:

The adaptive digital beamforming technique in the space-polarization domain suppresses the interference with forming the coupling nulls of space and polarization domain. When there is the interference in mainlobe, it will cause serious mainlobe distortion, that the target detection suffers from. To overcome this problem and make radar cope with the complex multiple interferences scenarios, we propose a multiple mainlobe and/or sidelobe interferences suppression method for dual polarization array radar. Specifically, the proposed method consists of a signal preprocessing based on the proposed angle estimation with degree of polarization (DoP), and a filtering criterion based on the proposed linear constraint. The signal preprocessing provides the accurate estimated parameters of the interference, which contributes to the criterion for null-decoupling in the space-polarization domain of mainlobe. The proposed method can reduce the mainlobe distortion in the space-polarization domain while suppressing the multiple mainlobe and/or sidelobe interferences. The effectiveness of the proposed method is verified by simulations.

Key words: multiple interferences suppression, dual polarization array radar, null-decoupling

Yawei LU, Jiazhi MA, Longfei SHI, Yuan QUAN. Multiple interferences suppression with space-polarization null-decoupling for polarimetric array[J]. Journal of Systems Engineering and Electronics, 2021, 32(1): 44-52.

Figures/Tables 11

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Algorithm	θ/(°)	γ/(°)	η/(°)	INR/SNR/dB
Interference 1	2	30	90	35
Interference 2	5	60	90	25
Interference 3	25	80	90	10
Target signal	1.9	0	90	10

Algorithm	Interference 1		Interference 2		Interference 3		Gain at target direction/dB
Algorithm	Null 1/(°)	Gain/dB	Null 2/(°)	Gain/dB	Null 3/(°)	Gain/dB	Gain at target direction/dB
SMI	2.01	?57.45	4.99	?55.92	24.95	?52.08	?37.50
Method in [30]	1.85, 31.98	?57.22	5.53, 54.41	?35.17	23.75, 40.45	?25.32	?13.83
The proposed method	2.01, 30.45	?41.91	4.97, 59.82	?49.15	25.04, 79.91	?53.10	?6.18

Signal sampling point	Method in [30]/s	The proposed method without PSO/s	The proposed method with PSO/s
256	0.002 8	0.150 6	0.066 5
512	0.003 3	0.171 4	0.072 6
1024	0.002 6	0.222 7	0.083 9

Multiple interferences suppression with space-polarization null-decoupling for polarimetric array

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