Angle estimation of unresolved targets in monopulse radar via creating multiple antenna sets using an extra antenna

Document Type : Original Article

Authors

1 Assistant Professor, Khatam Al Anbia Air Defense University, Tehran, Iran

2 Associate Professor, K.N. Toosi University, Tehran, Iran

3 Assistant Professor, Imam Hossein University, Tehran, Iran

4 Assistant Professor, Imam Hossein . University, Tehran, Iran

Abstract

Conventional monopulse radar cannot detect the direction of two closely-spaced targets in one resolution cell by utilizing the monopulse ratio. In this study, virtual amplitude-comparison monopulse signals are generated from the received phase-comparison monopulse signals, then a solution for estimation of the angles of two unresolved targets using a single snapshot of four independent channels is presented. If both targets have the same azimuth or elevation angle, the proposed scheme cannot detect their angles; an additional antenna is required, to detect such targets' angles. In this study, the antenna array is divided into multiple overlapping sets, to detect the direction of two targets at generalized positions in two different coordinates. Combining the outputs from multiple antenna sets improves the angle estimation performance and accuracy. The impact of SNR, the angle difference between the targets, and the phase difference of target signals on the accuracy of angle estimation have also been explained. The effectiveness of the proposed method is validated by comparing the exact solutions and simulations.

Keywords

Smiley face

References

[1]     Samuel M. Sherman, David K. Barton, “Monopulse Principles and Techniques (2nd ed.)”, Boston, MA: Artech House, pp. 187–223, 2011.
[2]     Gogineni, S. Nehorai, “Monopulse MIMO radar for target tracking,” IEEE Trans. Aerospace. Electron. System, 47, (1), pp. 755–768, 2011.
[3]     Z. Wang, A. Sinha, P. Willett, “Angle estimation for two unresolved targets with monopulse radar,” IEEE Transactions On Aerospace and Electronic Systems, 998 – 1019, 2004.
[4]     Wang, L, Z. Xu, X. Liu, et al, “Estimation of unresolved targets number based on Gerschgorindisks,” IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC), 1–5, Beijing, China, 2017.
[5]     Ma. J, L. Shi, J. Liu, “Improved two-targets resolution using dual-polarization radar with interlaced subarray partition,” IEEE International Conference on Electronic Measurement & Instruments, 397–400, China, 2017.
[6]     Gorji. A, R. Tharmarasa, W. D. Blair, “Multiple unresolved target localization and tracking using colocated MIMO radars”, IEEE Transactions on Aerospace and Electronic Systems, Vol. 48, No. 3, 2498–2517, 2012.
[7]     Seung-Phill Lee, Byung-Lae Cho, Sang-Min Lee, “Unambiguous Angle Estimation of Unresolved Targets in Monopulse Radar,” IEEE Transactions on Aerospace and Electronic Systems, VOL.51, NO. 2, April 2015.
[8]     Bosse. J, and O. Rabaste, “Subspace rejection for matching pursuit in the presence of unresolved targets,” IEEE Transactions on Signal Processing, Vol. 66, No.8, 2018.
[9]     Shengbin Luo Wang, Zhen-Hai Xu, Xinghua Liu, Wei Dong, Guoyu Wang, “A Novel Scheme for Detection and Estimation of Unresolved Targets With Stepped-Frequency Waveform,”  IEEE Access, Volume 7, 2019.
[10]  Zhao, Y. N., Z. Q. Zhou, X. L. Qiao, “Angle estimation for two closely spaced targets with polarization monopulse radar,” Proceeding of 2005 Asia-Pacific Microwave Conference, 3– 8, Suzhou, China, 2005.
[11]  S. M. Solhi Juybari, J. Mazloum, “Sensor Placement in Localization of Multiple Sources in the Presence of Distance Dependent Noise,” Journal of “Radar”, Vol. 7, No. 1, 2019, (In Persian).
[12]  Zhiyong Song, Fei Cai, and Qiang Fu, “A Joint Detection and Tracking Algorithm for Unresolved Target and Radar Decoy,” Progress in Electromagnetics Research, Vol. 83, 43–60, 2019.
[13]  Zhenxing Lu, Yunjie Li, Meiguo Gao, “Direction estimation for two steady targets in monopulse radar,” Journal of Systems Engineering and Electronics, February, Vol. 26, No. 1, pp.61–68, 2015.
[14]  Zheng, Y. Tseng, Yu K-B, “Closed-form four-channel monopulse two-target Resolution,” IEEE Transactions on Aerospace and Electronic Systems, 39, 3, 1083—1089, 2003.
[15]  Yufei, W. Jiazhi, M. Longfei Sh, “Algorithm supplement of four-channel two-target resolution for amplitude-comparison monopulse radar,” Electronics Letters, Vol. 57 No. 17, 2021.
[16]  Wang Jianlu, Xu Xiong, Dai Huanya, Sun Danhui, Qiao Huidong, “Method for four-channel monopulse radar to resist dual-source angle deception jamming,” The Journal of Engineering IET, 2018.
[17]  Seifallah Jardak, S. Ahmed, Mohamed-Slim, Alouini, “Generalised two target localisation using passive monopulse radar”, IET Radar Sonar Navig, Vol. 11, pp. 932-936, 2017.
[18]  Seifallah Jardak, S.Ahmed, Mohamed-Slim Alouini, “Two Target Localization Using Passive Monopulse Radar,” 2015 IEEE radar conference.
[19]  Shengbin Luo Wang, Zhen-Hai Xu, Xiao Yang, Zhongren Li, Guoyu Wang, “Efficient and Unambiguous Two-Target Resolution via Subarray-Based Four-Channel Monopulse,” IEEE Transactions On Signal Processing, VOL. 68, 2020.
[20]  David F. Crouse, “Comments on Closed-Form Four-Channel Monopulse Two-Target Resolution,” IEEE Transaction Aerospace Electronic System, January 2012, VOL. 48, NO.1.
[21]  Habib, Rezaei. Mohammad Ali Sebt, Nadali, Zarei, Goudarz Saadati Moghadam, “Unambiguous Direction Estimation and Localization of Two Unresolved Targets via Monopulse Radar,” Electronics, 11(22), 3780, 2022. 
[22]  Habib, Rezaei. Mohammad Ali Sebt, Nadali, Zarei, Goudarz Saadati Moghadam, “Closed-form angle estimation of unresolved targets in monopulse radar to counter the angular electronic attack,” IET Signal Processing, 2023.
Radar
Volume 11, Issue 1
Serial number 29, spring and summer quarterly
August 2023

Files

History

  • Receive Date: 25 March 2023
  • Revise Date: 30 June 2023
  • Accept Date: 29 July 2023
  • Publish Date: 23 August 2023

Share

How to cite

Statistics