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The method of moments is one of the most commonly used algorithms for analyzing the electromagnetic scattering problems of conductor targets. However, it is difficult to solve the matrix equation when analyzing the electromagnetic scattering problem of the electric large target. In recent years, the theory of the compressed sensing was introduced into the method of moments to improve the computation efficiency. The random selected impedance matrix is used as a measurement matrix, and the excitation voltage is used as a measurement value when using compressed sensing theory. The recovery algorithm is used to solve the induced current of target. The method can avoid the inverse problem of matrix equation and improve the computational efficiency of the method of moments, but it can be applied only to 2-dimensional or 2.5-dimensional target. The application of compressed sensing needs to know the sparse basis of the current in advance, but the induced current of three-dimensional target which is expressed by an Rao-Wilton-Glisson basis function is not sparse on the commonly used sparse basis, such as discrete cosine transform basis and discrete wavelet basis. To solve this problem, a method of combining compressed sensing with characteristic basis functions is proposed to analyze the electromagnetic scattering problem of three-dimensional conductor target in this paper. The characteristic basis function method is an improved method of moments. The target is divided into several subdomains, the main characteristic basis functions are comprised of current bases arising from the self-interactions within the subdomain, and the secondary characteristic basis functions are obtained from the mutual coupling effects of the rest of the subdomains. Then a reduction matrix is constructed to reduce the order of matrix equation, and the current can be expressed by the characteristic basis function and its weighting coefficient. In the method presented in this paper, the weighting coefficient is considered as a sparse vector to be solved when the characteristic basis function is used as sparse basis. The number of weighting coefficients is less than the number of unknown ones, so it can be obtained from the compressed sensing recovery algorithm. At the same time, the generalized orthogonal matching pursuit algorithm is used as the recovery algorithm to speed up the recovery process. Finally, the proposed method is used to calculate the radar cross sections of a PEC sphere, nine discrete PEC targets and a simple missile model. The numerical results validate the accuracy and efficiency of the method.
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Keywords:
- method of moments /
- characteristic basis function /
- compressed sensing
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[2] Andriulli F P, Cools K, Bagci H, Olyslager F, Buffa A, Christiansen S, Michelssen E 2012 IEEE Trans. Antennas Propag. 56 2398
[3] Chen Y, Zuo S, Zhang Y, Zhao X, Zhang H 2017 IEEE Trans. Antennas Propag. 65 3782
[4] Cand E J, Wakin M B 2008 IEEE Signal Process. Mag. 25 21
[5] Ji S, Xue Y, Carin L 2008 IEEE Trans. Signal Process. 65 3782
[6] Ender J H G 2010 IEEE Trans. Signal Process. 65 3782
[7] Wang Z, Wang B Z 2014 Acta Phys. Sci. 63 120202 (in Chinese)[王哲, 王秉中 2014 物理学报 63 120202]
[8] Chai S R, Guo L X, Li J, Li K 2015 Asia-Pacific Microwave Conference Nanjing, China Dec. 6-9, 2015 p1
[9] Kong M, Chen M S, Wu B, Wu X 2017 IEEE Antennas Wirel. Propag. Lett. 1 99
[10] Wang Z, Wang B Z, Wen Y Q, Wang R 2015 IEEE International Symposium on Antennas and Propagation Usnc/ursi National Radio Science Meeting Vancouver, BC, July 19-24, 2015 p1488
[11] Chao X Y, Chen M S, Wu X L, Shen J 2013 Chin. J. Electron. 41 2361 (in Chinese)[曹欣远, 陈明生, 吴先良, 沈晶 2013 电子学报 41 2361]
[12] Du H M, Chen M S, Wu X L 2012 International Conference on Microwave and Millimeter Wave Technology Shenzhen, China May 5-8, 2012 p1
[13] Chai S R, Guo L X 2015 Acta Phys. Sin. 64 060301 (in Chinese)[柴水荣, 郭立新 2015 物理学报 64 060301]
[14] Prakash V V S, Mittra R 2003 Microw. Opt. Technol. Lett. 36 95
[15] Sun Y F, Chan C H, Mittra R, Tsang L 2003 Antennas and Propagation Society International Symposium Columbus, OH, USA June 22-27, 2003 p1068
[16] Wang Z G 2014 Ph. D. Dissertation (Hefei:Anhui University) (in Chinese)[王仲根 2014 博士学位论文(合肥:安徽大学)]
[17] Jian W, Kwon S, Shim B 2012 IEEE Trans. Signal Process. 60 6202
[18] Tropp J A, Gilbert A C 2007 IEEE Trans. Inf. Theory 53 4665
[19] Baraniuk R G, Cevher V, Duarte M F, Hegde C 2010 IEEE Trans. Inf. Theory 56 1982
[20] Duarte M F, Eldar Y C 2011 IEEE Trans. Signal Process. 59 4053
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[1] Gibson W C 2014 J. Electromagn. Waves Appl. 1 181
[2] Andriulli F P, Cools K, Bagci H, Olyslager F, Buffa A, Christiansen S, Michelssen E 2012 IEEE Trans. Antennas Propag. 56 2398
[3] Chen Y, Zuo S, Zhang Y, Zhao X, Zhang H 2017 IEEE Trans. Antennas Propag. 65 3782
[4] Cand E J, Wakin M B 2008 IEEE Signal Process. Mag. 25 21
[5] Ji S, Xue Y, Carin L 2008 IEEE Trans. Signal Process. 65 3782
[6] Ender J H G 2010 IEEE Trans. Signal Process. 65 3782
[7] Wang Z, Wang B Z 2014 Acta Phys. Sci. 63 120202 (in Chinese)[王哲, 王秉中 2014 物理学报 63 120202]
[8] Chai S R, Guo L X, Li J, Li K 2015 Asia-Pacific Microwave Conference Nanjing, China Dec. 6-9, 2015 p1
[9] Kong M, Chen M S, Wu B, Wu X 2017 IEEE Antennas Wirel. Propag. Lett. 1 99
[10] Wang Z, Wang B Z, Wen Y Q, Wang R 2015 IEEE International Symposium on Antennas and Propagation Usnc/ursi National Radio Science Meeting Vancouver, BC, July 19-24, 2015 p1488
[11] Chao X Y, Chen M S, Wu X L, Shen J 2013 Chin. J. Electron. 41 2361 (in Chinese)[曹欣远, 陈明生, 吴先良, 沈晶 2013 电子学报 41 2361]
[12] Du H M, Chen M S, Wu X L 2012 International Conference on Microwave and Millimeter Wave Technology Shenzhen, China May 5-8, 2012 p1
[13] Chai S R, Guo L X 2015 Acta Phys. Sin. 64 060301 (in Chinese)[柴水荣, 郭立新 2015 物理学报 64 060301]
[14] Prakash V V S, Mittra R 2003 Microw. Opt. Technol. Lett. 36 95
[15] Sun Y F, Chan C H, Mittra R, Tsang L 2003 Antennas and Propagation Society International Symposium Columbus, OH, USA June 22-27, 2003 p1068
[16] Wang Z G 2014 Ph. D. Dissertation (Hefei:Anhui University) (in Chinese)[王仲根 2014 博士学位论文(合肥:安徽大学)]
[17] Jian W, Kwon S, Shim B 2012 IEEE Trans. Signal Process. 60 6202
[18] Tropp J A, Gilbert A C 2007 IEEE Trans. Inf. Theory 53 4665
[19] Baraniuk R G, Cevher V, Duarte M F, Hegde C 2010 IEEE Trans. Inf. Theory 56 1982
[20] Duarte M F, Eldar Y C 2011 IEEE Trans. Signal Process. 59 4053
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