volume | PIER Journals

Abstract

In this paper, we describe the design of a hybrid 24 GHz RADAR array for termite detection and imaging. The array uses MIMO techniques to provide transmit beam steering and null steering in conjunction with the Matrix Enhanced Matrix Pencil (MEMP), which provides direction of arrival processing. We describe the selection of our MIMO orthogonal codes and test their suitability. Simulated results are shown for our array design and MIMO processing in a range of applications MIMO enables us to produce flexible nulling and beam steering for our transmitter array as well as reducing multipath re°ections and narrowband interference. MIMO processing also produces large time savings, enabling longer, more accurate acquisitions which can increase SNR. Transmitter beam-forming, produces an SNR improvement of 18.2 dB and can be used to reject clutter by up to 20 dB. Flexible nulling can reject interferers still further.

1. Caulfield, R. and P. Daly, An analysis of termite damage in Sydney and Melbourne, Hawthorn, Victoria, Australia, 2006.

2. Tirkel, A. Z., G. J. Sanderson, and R. J. Davies, Termite detection system, 6313643, June 11, 2001.

3. National telecommunications and information administration, Federal Standard 1037C, 1996.

4. Le Marshall, N. W. D. and A. Z. Tirkel, "Modified matrix pencil algorithm for termite detection with high resolution RADAR," Progress In Electromagmnetics Research C, Vol. 16, 51-67, September 2010.
doi:10.2528/PIERC10060903 Google Scholar

5. Le Marshall, N. W. D., G. A. Rankin, and A. Z. Tirkel, "High resolution, wide coverage termite imager," PIERS Proceedings, 663-667, Xian, China, March 22-26, 2010. Google Scholar

6. Hua, Y., "Estimating two-dimensional frequencies by matrix enhancement and MEMP," IEEE Transactions on Signal Processing, Vol. 40, No. 9, 2267-2280, September 1992.
doi:10.1109/78.157226 Google Scholar

7. Paulraj, A., R. Roy, and T. Kailath, "Estimation of signal parameters via rotational invariance technique --- ESPRIT," IEEE Transactions on Acoustics, Speech and Signal Processing, Vol. 37, No. 7, 984-995, July 1989. Google Scholar

8. Schmidt, R. O., "Multiple emitter location and signal parameter estimation," IEEE Transactions on Antennas and Propagation, Vol. 34, No. 3, 276, March 1986.
doi:10.1109/TAP.1986.1143830 Google Scholar

9. Bachl, R., "The forward-backward averaging technique applied to TLS-ESPRIT processing ," IEEE Transactions on Signal Processing, Vol. 43, No. 11, 2691-2699, November 1995.
doi:10.1109/78.482118 Google Scholar

10. Le Marshall, N. W. D. and A. Z. Tirkel, "The application of the MEMP and beamforming to determine the presence of termites in situ ," IEEE Eurocon 2009 Proceedings, 1568-1572, 2009.
doi:10.1109/EURCON.2009.5167850 Google Scholar

11. Le Marshall, N. W. D., G. A. Rankin, and A. Z. Tirkel, "Hybrid array for the detection and imaging of termites," Radio and Wireless Symposium 2010, 288-291, New Orleans, USA, 2010. Google Scholar

12. Brown, G., "Spartan-DSP takes aim at affordable DSP performanc," DSP Magazine, No. 3, 8-9, 2007. Google Scholar

13. Burintramart, S. and T. Sarkar, "Target localization in three dimensions," Advances in Direction of Arrival Estimation, Artech House, 2005. Google Scholar

14. Friedlander, B., "Direction finding using an interpolated array," International Conference on Acoustics, Speech and Signal Processing, Vol. 5, 2951-2954, 1990.

15. Kyungjung, K., T. K. Sarkar, and M. S. Palma, "Adaptive processing using a single snapshot for a nonuniformly spaced array in the presence of mutual coupling and near-field scatterers," IEEE Transactions on Antennas And Propagation, Vol. 50, No. 5, 582-590, May 2002.
doi:10.1109/TAP.2002.1011223 Google Scholar

16. Donnet, B. J. and I. D. Longstaff, "MIMO radar, techniques and opportunities," 3rd European Radar Conference, 2006, 112-115, Manchester, September 2006.

17. Everett, D., "Periodic digital sequences with pseudonoise properties," GEC Journal, Vol. 33, No. 3, 115-126, 1996. Google Scholar

18. Bak, P., C. Tang, and K. Wiesenfeld, "Self-organized criticality: An explanation of the 1/f noise," Physical Review Letters, Vol. 59, No. 4, 381-384, 1987.
doi:10.1103/PhysRevLett.59.381 Google Scholar

19. Schottky, W., "Small-shot effect and flicker effect," Physical Review, Vol. 28, No. 6, 1331, 1926.
doi:10.1103/PhysRev.28.1331 Google Scholar

20. Dandekar, K. R., L. Hao, and X. Guanghan, "Experimental study of mutual coupling compensation in smart antenna applications," IEEE Transactions on Wireless Communications, Vol. 1, No. 3, 1536-1276, July 2002. Google Scholar

21. Boyd, S. and L. Vandenberghe, Convex Optimization, Cambridge University Press, March 2004.

22. Boyd, M. and S. Grant, CVX: MATLAB software for disciplines convex programming, June 2009, http://stanford.edu/»boyd/cvx.

23. Toh, K., M. J. Todd, and R. H. Tutunc, SDPT3 --- A MATLAB software for semidefinite-quadratic-linear programming, 2009, http://www.math.nus.edu.sg/~mattohkc/sdpt3.html.

24. Lebret, H. and S. Boyd, "Antenna array pattern synthesis via convex optimization," IEEE Transactions on Signal Processing, Vol. 45, No. 3, 526-532, March 1997.
doi:10.1109/78.558465 Google Scholar

25. Albagory, Y. A., M. Dessouky, and H. Sharshar, "An approach for low sidelobe beamforming in uniform concentric circular arrays," Wireless Personal Communications, Vol. 43, No. 4, 1363-1368, June 2007.
doi:10.1007/s11277-007-9310-3 Google Scholar

Dr. Nick W. D. Le Marshall

Dr. Andrew Z. Tirkel