Covariance Matrix Synthesis Using Maximum Ratio Combining in Coherent MIMO Radar with Frequency Diversity

• Jeon, Hyeonmu (Dept. of Wireless Communications Engineering, Kwangwoon University) ;
• Chung, Yongseek (Dept. of Wireless Communications Engineering, Kwangwoon University) ;
• Chung, Wonzoo (Devision of Computer and Communications Engineering, Korea University) ;
• Kim, Jongmann (Agency for Defense Development) ;
• Yang, Hoongee (Dept. of Wireless Communications Engineering, Kwangwoon University)
• Accepted : 2017.08.14
• Published : 2018.01.01

Abstract

Reliable detection and parameter estimation of a radar cross section(RCS) fluctuating target have been known as a difficult task. To reduce the effect of RCS fluctuation, various diversity techniques have been considered. This paper presents a new method for synthesizing a covariance matrix applicable to a coherent multi-input multi-output(MIMO) radar with frequency diversity. It is achieved by efficiently combining covariance matrices corresponding to different carrier frequencies such that the signal-to-noise ratio(SNR) in the combined covariance matrix is maximized. The value of a synthesized covariance matrix is assessed by examining the phase curves of its entries and the improvement on direction of arrival(DOA) estimation.

File

Fig. 1. Correlation versus frequency interval

Fig. 2. Phase curves in first row entries

Fig. 3. MSE of DOA estimation versus frequency interval

Fig. 4. MSE of DOA estimation in Swerling I model

References

1. M. A. Richards, "Fundamentals of radar signal processing," New York: McGraw-Hill, 2005.
2. J. Li and P. Stoica, "MIMO radar signal processing," New Jersey: John Wiley and Sons, 2009.
3. A. M. Haimovich, R. S. Blum and L. J. Cimini, mitry Chizhik, and Reinaldo A. Valenzuela, "Spatial diversity in radars-models and detection performance," IEEE Trans. signal processing, vol. 54, pp. 823-838, 2006. https://doi.org/10.1109/TSP.2005.862813
4. A. M. Haimovich, R. S. Blum and L. J. Cimini, "MIMO Radar with widely separated antennas," IEEE Signal Processing Magazine, vol. 25, no. 1, pp. 116-129, 2008. https://doi.org/10.1109/MSP.2008.4408448
5. H. Liu, S.Zhou, H. Su and Y. Yu, "Detection performance of spatial-frequency diversity MIMO radar," IEEE Trans. Aerospace and Electronic Systems, vol. 50, pp. 3137-3155, Oct. 2014. https://doi.org/10.1109/TAES.2013.120040
6. K. V. Shanbhag, D. Deb and M. Kulkarni, "MIMO radar with spatial-frequency diversity for improved detection performance," presented at the IEEE Int. Conf. Communication Control and Computing Technologies, Tamil Nadu, India, Oct. 2010.
7. J. J. Zhang and A. Papandreou-Suppappola, "MIMO radar with frequency diversity," in Proc. International Conference of Waveform Diversity and Dessign, Kissimmee, USA, Feb. 2009, pp. 208-212.
8. J. Li and P. Stoica, "MIMO Radar with collocated antennas," IEEE Signal Processing Magazine, vol. 24, no. 5, pp. 106-114, 2007. https://doi.org/10.1109/MSP.2007.904812
9. M. S. Davis and A. D. Lanterman, "Coherent MIMO radar: The phased array and orthogonal waveforms," IEEE Aerospace and Electronic Systems Magazine, vol. 29, pp. 76-91, Aug. 2014.
10. X.-R. Li, Z. Zhang, W. -X. Mao, X. -M. Wang, J. Lu and W. -S. Wang, "A study of frequency diversity MIMO radar beamforming," presented at the IEEE 10th Int. Conf. Signal Processing, Beijing, China, Oct. 2010.
11. M. Bica and V. Koivunen, "Generalized Multicarrier Radar: Models and Performance," IEEE Trans. Signal Processing, vol. 64, pp. 4389-4402, Sep. 2016. https://doi.org/10.1109/TSP.2016.2566610
12. C. Gao, K. C. Teh and A. Liu, "Orthogonal Frequency Diversity Waveform with Range-Doppler Optimization for MIMO Radar," IEEE Signal Processing Letters, vol. 21, pp. 1201-1205, Oct. 2014. https://doi.org/10.1109/LSP.2014.2329944
13. B. Kang, V. Monga and M. Rangaswamy, "Computationally Efficient Toeplitz Approximation of Structured Covariance Under a Rank Constraint," IEEE Trans. Aerospace and Electronic Systems, vol. 51, pp. 775-785, Aug. 2014
14. A. Goldsmith, "Wireless communication", New York: Cambridge university press, 2005.