ERROR MODEL FOR SPATIAL SPECTRUM ESTIMATION OF M ILL IM ETER2WAVE THERMAL RAD IATION ARRAY
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1 J. Infrared M illim. W aves Vol. 29, No. 2 Ap ril, 2010 : ( , 3,,, (, :,.,,,.,,. : ; ; ; ; : TN911. 7: A ERROR MODEL FOR SPATIAL SPECTRUM ESTIMATION OF M ILL IM ETER2WAVE THERMAL RAD IATION ARRAY WU Lu2Lu, HU Fei 3, ZHU Yao2Ting, L IQ ing2xia, J IN Rong (Department of Electronics & Information Engineering, Huazhong University of Science and Technology,W uhan430074, China Abstract: In order to app ly spatial spectrum estimation to m illimeter2wave thermal radiation array receiving system for de2 tecting targets with superior resolution, it is needed to solve two key p roblem s which are weaknesses of thermal signalsen2 ergy em itted from targets and the decline of performance caused by array errors. To solve these p roblem s, an array error model with low signal2noise ratio ( SNR was p resented. In this model, the influences of amp litude and phase errors on sig2 nal source and channel noise were considered, and the perturbation range of the eigenvalues and the error distance of the signal eigenvector space of the autocorrelation matrix received by arrays were derived. Then the calibration algorithm for amp litude and phase errors based on the model was p roposed, which could make the spatial spectrum estimation with high resolution be used in m illimeter2wave radiation array system effectively. The effectiveness and correctness of the model are verified by the experiments. Key words: m illimeter2wave thermal radiation; low signal noise ratio ( SNR ; array errors; calibration; spatial spectrum estimation,,, [ 1 ].,,..,,,,,.,, : , : Rece ived da te: , rev ised da te: : ( ,863 (2006AA09Z143 :(19802,,,,. 3 : hufei@hust. edu. cn
2 124 29,, [ 24 ],. (, [ 5 ] 15dB [ 59 ]., ( - 20dB,.,,,.,, [ 1 ] : X ( t old =a ( s S ( t + N ( t, (1 X ( t old N 1, N N, s, a ( s, S ( tm 1, N ( tn 1, R old : R old = o 2 sa ( s a H ( s H + 2 I, (2, 2 s, 2, N N : = d iag [ 1 2 N ], diag, (3 i i1: i = i e j 1 i = 2, 3,, N, (4, i i i. ( 1 (2,, S ( t, N ( t.,,,,n ( t. : X ( t new =a ( s S ( t +N ( t, (5 R new : R new = o 2 sa ( s a H ( s H + 2 H. (6 (6,,. 2 H, a ( s [ 1, 5 ] R org ( : R org X =a ( s = o 2 sa ( s a H ( s H. (7 = [ 1 a 1 ( s 2 a 2 ( s N a N ( s ] T, (8 R org = o 2 s XX H, (9 R org X = o 2 s XX H X = ( o 2 s X H X X = 1 X, (10 1 = 2 s XX H = 2 s a ( s R org, X = a ( s. R org R org : = U d iag [ 1 2 N ] U H = U d iagg o 2 s a ( s 00U H, (11 U, diag [ 1 2 N ], 1 = 2 s a ( s, 2 = 3 = = N = 0. R old = R org + 2 I, (12 i I - R org = i I - (R old - 2 I = ( i + 2 I - R old = i I - R old = 0. (13, R old : R old = U d iag [ 1 2 N ]U H = U d iag [ ]U H = U d iag [ o 2 s a ( s ]U H, (14 U, diag [ 1 2 N ], 1 = 2 s a ( s + 2, 2 = 3 = = N = 2. (1 ( 2 (13 (14, (1X ( t old,, 2 ; ( 2 2 R old i,.
3 2 : 125,. ( (5 ( 6 R new : R new = R org + 2 H, (15 2 H = d iag [ N ] = d iagg N. (16 1 [ 10 ], R new i : i + 2 m in ( i i + 2 max(. (17, (17: i - 2 (max ( - m in ( i i. (18 i ( 18, R new i : o 2 s a ( s - 2 (max( - m in ( i o 2 s a ( s 2 s N - 2 (max( 2 - m in i (2 i i 2 s N a, (19 2 (m in ( - max ( 0. (20 (19 (20, ( 1 R new 2 i ; (2 2, i, R new ; ( 3 s2 µ 2,, i i, R new R old,. 2 [ 10 ], E = 2 ( H - I, (21 R new = R old + E, (22 D = R new X - X 1 = (R new - 1 I X. (23 9 == 1 = 1 + 2, (24 = max (, (25 R new R old : sin ( (X Rold, X R new D /. (26 (26,, R new R old,. 1 (25,max( > 1, = 2 s a ( s m ax ( a i N = 2 s max ( = 2 s s imax( 1 max ( m ax (, (27 (27, 2,, R new R old, 2. 2 S ( t, S ( t N ( t, X ( t, R new, R new,. 1 s, a ( s. 1 I. R n new : 2 n R new R n new = inv ( n R new inv ( ( n H = 2 s inv ( n a ( s a H ( s H inv ( ( n H + nv ( n H inv ( ( n H, (28, inv., n R n new, n, inv ( n H inv ( ( n H I, R n new. R n new, : R n new = U n n U nh, (29, n : n = d iagg n 1 n 2 n N, > n 2 n 3. (30 n 1 U n : U n = gu n 1 u n 2 u n N. (31 n + 1 n N = kd iag ( u n 1 3 inv ( d iag ( a ( s, (32 = / 1, (33
4 n + 1 : = n 3. (34 3 (,, n - <. (35, n ,. 1. 1,8mm, 16, 1, 90. 2, 0. 3m(0. 5m ; 1,, GHz, 23dB; 1,15m, ,,. 49m, 12m, 50m., 1020, (10, MUSIC [ 11 ], ,,.
5 2 : m 0. 5m,2m. 4,,,.,,,., (,. REFERENCES [ 1 ]WANG Yong2L iang, CHEN Hui, PENG Ying2N ing, et al. The theory and calculation of Spatial Spectrum estim ation [M ]. Beijing: Tsinghua university p ress(,,.. :, 2004, [ 2 ]W eiss A J, Friedlander B. Effects of modeling errors on the resolution threshold of the MUSIC algorithm [ J ]. IEEE Trans. on S ignal P rocessing, 1994, 42 (6 : [ 3 ]L i F, Vaccaro R J. Sensitivity analysis of DOA estimation algorithm s to sensor errors [ J ]. IEEE Trans. on A erospace and Electronic System s, 1992, 28 (3 : [ 4 ] Swindlehurst A L, Kailath T. A performance analysis of subspace2based methods in the p resence of model errors, part I: the MUSIC algorithm [ J ]. IEEE Trans. on S ignal Processing, 1992, 40 (7 : [ 5 ] ZHOU Q ing2hui, J ING Xue2M ing, XUE Zong2Ze. Calibra2 tion of channel m ismatch in super2resolution direction find2 ing[ J ]. Radar Science and Technology (,,.., 2006, 4 (5 : [ 6 ]Hung E K L. M atrix2construction calibration method for an2 tenna arrays[ J ]. IEEE Trans. on A erospace and Electronic System s, 2000, 36 (3 : [ 7 ] Zhang M, Zhu Z D. DOA estimation with sensor gain, phase and position perturbations [ C ]. Proceedings of the IEEE National Aerospace and Electronics Conference, NAECO, 1993, 1: [ 8 ] Fistas N, Manikas A. A new general global array calibration method[ C ]. Proceedings of IEEE ICASSP 94, 1994, 4: [ 9 ]L I Yue2Hua,L I Xing2Guo,N ING Jun, et al. Error correction of quadrature coherent I/Q channels of step frequency high resolution MMW radar based on SVD of matrix[ J ]. J. Infra2 red M illim. W aves(,,,. I/Q., 1998, 17 (4 : [ 10 ] Sun J i2guang. The analysis of M atrix perturbation [M ]. Beijing: science p ress(.. :, 2001, [ 11 ] Schm idt R O. Multip le em itter location and signal parame2 ter estimation[ J ]. IEEE Trans on A ntennas and Propaga2 tion, 1986, AP234 (3 : ( 116 [ 6 ] CHEN Zhong2M ing SH I Fei, ZHU L i2hua. Yields of car2 bonyl p roducts from the gas2phase oxidation of isop rene with excess ozone[ J ]. Environm ental Chem istry (,,.., 2005, 24 (5 : [ 7 ]Hao L Q, W ang Z Y, Huang M Q, et al. Size distribution of the secondary organic aerosol particles from the photooxi2 dation of toluene [ J ]. J. Environ. Sci., 2005, 17 ( 6 : [ 8 ]L iu X Y, ZhangW J, Huang M Q, et al. Effect of illum i2 nation intensity and light app lication time on secondary or2 ganic aerosol ( SOA formation from the photooxidation of 2p inene[ J ]. J. Environ. Sci., 2009, 21 (4 : [ 9 ]A tkinson R, CarterW P L, W iner A M, et al. An experi2 mental p rotocol for the determ ination or OH radical rate con2 stants with organics using methyl nitrite photolysis as an OH radical source [ J ]. J A ir Pollution Control A ssociation, 1981, 31 (10 : [ 10 ] Frisch M J, Trucks G W, Schlegel H B, et al. Gaussian 03, Revision C. 01, Gaussian, Inc., W allingford CT, Q [ 11 ]Hohenberg P, Kohn W. Inhomogeneous electron gas[ J ]. Phys. Rev. B, 1964, 136 (3B : [ 12 ] Kohn W, Sham L J. Self2consistent equations including exchange and correlation effects[ J ]. Phys. Rev. A, 1965, 140 (4A : [ 13 ] Parr R G, YangW. D ensity2functional theory of atom s and m olecules[m ]. Oxford University: Oxford, 1989, [ 14 ]A t the Essential FTIR website: Essential FTIR Free File V iewermode, http: / /www. essentialftir. com /. [ 15 ]LU Yong2Quan, DENG Zhen2Hua. Practical Infrared spec2 trom etry analysis[m ]. Beijing: Electronic industryprss(,.. :, 1989, [ 16 ]Ruppert L, Becker K H. A p roduct study of the OH radi2 cal2initiated oxidation of isop rene: formation of C 5 2unsatu2 rated diols[ J ]. A tm os. Environ., 2000, 34 ( 10 :
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