volume | PIER Journals

Abstract

Through wall radar imaging and detection applications are growing significantly. However, the target response is usually accompanied with a strong clutter which veils the target detection. In this paper, a new algorithm is proposed for clutter reduction and target downrange correction in through wall monostatic radar imaging. The proposed algorithm arranges the received radar signals in a matrix and then splits this matrix to frames. The frames are individually processed and filtered in frequency domain, then they are returned to time domain and merged together in a new matrix. The final step is enhancing the target response via a matched filter. The proposed algorithm performance is evaluated by target to clutter ratio (TCR), signal to clutter ratio (SCR), and downrange target position error (DTPE) in three different simulated scenarios. The simulation results exhibit the proposed algorithm capability in both removing the clutter and adjusting the target downrange to be with an evident appearance and accurate position. In the most complicated scenario which consists of two separated walls and a target behind them, using the proposed algorithm improves the performance in terms of TCR, SCR and DTPE by 49.7 dB, 70.7 dB, and, 7.6% respectively.

1. Baharian, M., H. Rajabalipanah, M. H. Fakheri, and A. Abdolali, "Removing the wall effects using electromagnetic complex coating layer for ultra-wideband through wall imaging," IET Microwaves, Antennas & Propagation, Vol. 11, No. 4, 477-482, 2017.
doi:10.1049/iet-map.2016.0514

2. Thajudeen, C. and A. Hoorfar, "A hybrid bistatic-monostatic radar technique for calibration-free estimation of lossy wall parameters," IEEE Antennas & Wireless Propagation Letters, Vol. 16, 1249-1252, 2017.
doi:10.1109/LAWP.2016.2630006

3. Vishwakarma, S. and S. S. Ram, "Mitigation of through-wall distortions of frontal radar images using denoising autoencoders," IEEE Transactions on Geoscience & Remote Sensing, Vol. 58, No. 9, 6650-6653, Sept. 2020.
doi:10.1109/TGRS.2020.2978440

4. Zhu, Z., D. Yang, J. Zhang, and F. Tong, "Dataset of human motion status using IR-UWB through-wall radar," Journal of Systems Engineering & Electronics, Vol. 32, No. 5, 1083-1096, Oct. 2021.

5. Liu, X., H. Leung, and G. A. Lampropoulos, "Effect of wall parameters on ultra-wideband synthetic aperture through-the-wall radar imaging," IEEE Transactions on Aerospace & Electronic Systems, Vol. 48, No. 4, 3435-3449, Oct. 2012.
doi:10.1109/TAES.2012.6324724

6. Al-Zuhairi, D. T., A. M. Abed, J. M. Gahl, and N. E. Islam, "Phase-based window function and CD-DMAS beamforming for microwave breast cancer detection," IET Microwaves, Antennas & Propagation, Vol. 14, No. 7, 608-616, 2020.
doi:10.1049/iet-map.2018.6078

7. Dong, Z., B. Xue, J. Lei, X. Zhao, and J. Gao, "Study on propagation characteristics of ground penetrating radar wave in dikes and dams with polymer grouting repair using finite-difference time-domain with perfectly matched layer boundary condition," Sustainability, Vol. 14, No. 16, 1-15, 2022.

8. Tivive, F. H. C., A. Bouzerdoum, and M. G. Amin, "A subspace projection approach for wall clutter mitigation in through-the-wall radar imaging," IEEE Transactions on Geoscience & Remote Sensing, Vol. 53, No. 4, 2108-2122, Apr. 2015.
doi:10.1109/TGRS.2014.2355211

9. Zhang, L. Z., B. Y. Lu, Z.-M. Zhou, and X. Sun, "A wall-clutter suppression method based on spatial signature in MIMO through-the-wall radar imaging," Progress In Electromagnetics Research B, Vol. 55, 277-295, 2013.
doi:10.2528/PIERB13070103

10. Sleasman, T., M. F. Imani, M. Boyarsky, K. P. Trofatter, and D. R. Smith, "Computational through-wall imaging using adynamic metasurface antenna," OSA Continuum, Vol. 2, No. 12, 3499-3513, Dec. 2019.
doi:10.1364/OSAC.2.003499

11. Lazaro, A., D. Girbau, and R. Villarino, "Techniques for clutter suppression in the presence of body movements during the detection of respiratory activity through UWB radars," Sensors, Vol. 14, No. 2, 2595-2618, 2014.
doi:10.3390/s140202595

12. Verma, P. K., A. N. Gaikwad, D. Singh, and M. J. Nigam, "Analysis of clutter reduction techniques for through wall imaging in UWB range," Progress In Electromagnetics Research B, Vol. 17, 29-48, 2009.
doi:10.2528/PIERB09060903

13. Lim, Y. and S. Nam, "Target-to-clutter ratio enhancement of images in through-the-wall radar using a radiation pattern-based delayed-sum algorithm," Journal of Electromagnetic Engineering & Science, Vol. 14, No. 4, 405-410, Dec. 2014.
doi:10.5515/JKIEES.2014.14.4.405

14. Zheng, C., X. Xi, and Z. Song, "Through-the-wall radar clutter mitigation using stepped-frequency signal," Electronics Letters, Vol. 55, No. 1, 53-55, 2018.
doi:10.1049/el.2018.5004

15. Zhang, Y. and T. Xia, "In-wall clutter suppression based on low-rank and sparse representation for through-the-wall radar," IEEE Geoscience & Remote Sensing Letters, Vol. 13, No. 5, 671-675, May 2016.
doi:10.1109/LGRS.2016.2535161

16. Tang, V. H., A. Bouzerdoum, and S. L. Phung, "Wall clutter mitigation for radar imaging of indoor targets: A matrix completion approach," 21st Asia Pacific Symposium on Intelligent and Evolutionary Systems (IES), 116-121, Hanoi, Vietnam, 2017.

17. Tivive, F. H. C. and A. Bouzerdoum, "Clutter removal in through-the-wall radar imaging using sparse autoencoder with low-rank projection," IEEE Transactions on Geoscience & Remote Sensing, Vol. 59, No. 2, 1118-1129, Feb. 2021.
doi:10.1109/TGRS.2020.3004331

18. Zhou, Y., C. Huang, H. Liu, D. Li, and T.-K. Truong, "Front-wall clutter removal in through-the-wall radar based on weighted nuclear norm minimization," IEEE Geoscience & Remote Sensing Letters, Vol. 19, No. 3501405, 1-5, Nov. 2022.

19. Vishwakarma, S. and S. S. Ram, "Mitigation of through-wall distortions of frontal radar images using denoising autoencoders," IEEE Transactions on Geoscience & Remote Sensing, Vol. 58, No. 9, 6650-6663, Sept. 2020.
doi:10.1109/TGRS.2020.2978440

20. Shi, X., C. Wang, and C. Zheng, "Wall clutter mitigation based on spread spectrum radar in through-the-wall radar," Microwave and Optical Technology Letters, Vol. 62, No. 5, 1987-1990, May 2020.
doi:10.1002/mop.32253

21. Yoon, Y.-S. and M. G. Amin, "Spatial filtering for wall-clutter mitigation in through-the-wall radar imaging," IEEE Transactions on Geoscience & Remote Sensing, Vol. 47, No. 9, 3192-3208, Sept. 2009.
doi:10.1109/TGRS.2009.2019728

22. Kim, B., D. Kim, Y. Lim, D. Yang, S. Nam, and J.-H. Song, "A clutter rejection technique using a delay-line for wall-penetrating FMCW radar," IEICE Transactions on Electronics, Vol. 99-C, No. 5, 597-600, 2016.
doi:10.1587/transele.E99.C.597

23. Yang, S., H. Qin, X. Liang, and T. A. Gulliver, "Clutter elimination and harmonic suppression of non-stationary life signs for long-range and through-wall human subject detection using Spectral Kurtosis Analysis (SKA)-based Windowed Fourier Transform (WFT) method," Applied Sciences, Vol. 9, No. 2, 2019.

24. Banerjee, P. P. and G. Nehmetallah, "Linear and nonlinear propagation in negative index materials," Journal of the Optical Society of America B, Vol. 23, No. 11, 2348-2355, Nov. 2006.
doi:10.1364/JOSAB.23.002348

25. Loizou, P. C., Speech Enhancement Theory and Practice, 2nd Ed., CRC Press, Taylor & Francis Group, NW Boca Raton, FL, USA, 2013.
doi:10.1201/b14529

26. Jaiswal, R. and D. Romero, "Implicit wiener filtering for speech enhancement in non-stationary noise," 11th International Conference on Information Science & Technology (ICIST), 39-47, Chengdu, China, May 21-23, 2021.

27. Jaiswal, R. K., S. R. Yeduri, and L. R. Cenkeramaddi, "Single-channel speech enhancement using implicit Wiener filter for high-quality speech communication," International Journal of Speech Technology, Vol. 25, No. 3, 745-758, 2022.
doi:10.1007/s10772-022-09987-4

28. Aftanas, M., J. Sachs, M. Drutarovský, and D. Kocur, "Efficient and fast method of wall parameter estimation by using UWB radar system," Frequenz, Vol. 63, No. 11-12, 231-235, 2009.
doi:10.1515/FREQ.2009.63.11-12.231

29. Al-Zuhairi, D. T., J. M. Gahl, and N. E. Islam, "Compact dual-polarized quad-ridged UWB horn antenna design for breast imaging," Progress In Electromagnetics Research C, Vol. 72, 133-140, 2017.
doi:10.2528/PIERC16121405

30. Liu, L., Q. Chen, Y. Han, H. Xu, J. Li, and B. Wang, "Improved clutter removal by robust principal component analysis for chaos through-wall imaging radar," Electronics, Vol. 9, No. 25, 2020.

Dr. Dheyaa T. Al-Zuhairi

Dr. Abbas Salman Hameed

Dr. Sura F. Yousif