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The noise emitted by an underwater vehicle consists of several strong tones superimposed on a broad-band radiated noise component. Among them, the stable low-frequency tone noise induced by the reciprocating movements of the auxiliary machines in the underwater vehicle, carries characteristic information of the vehicle and is necessary for long-distance detection. Therefore, identification of the tone noise sources of an underwater vehicle is significant for noise reduction. On the basis of the joint information of space-time-frequency, beamspace time-frequency analysis (TFA) scheme is proposed for identification of low-frequency tone noise sources of underwater moving vehicle. First, the Doppler signals formed when the tone noise sources pass through the closest point of approach (CPA) are separated in time domain, by using superdirectivity beamforming of a small aperture circular array. The output signals can be approximated in linear form, i. e., LFM signal. After the LFM signals from the narrow beam are processed by two TFA methods of pseudo Wigner - Ville distribution and chirplet transform (CT), the time-frequency images of the noise signals are obtained. Then, the CPA time of each tone noise sources can be estimated by using peak search of the time-frequency images. At last, by converting the time coordinate to space coordinate and comparing with a reference source whose CPA time and position are known in advance, the positions of the low-frequency tone noise sources on the underwater vehicle are identified. The proposed scheme is different from the focused beamforming method, which scans the beam angle after eliminating the Doppler effect. Besides, due to no need of decorrelation usually used in the focused beamforming method, beamspace TFA scheme resolves the problem that array aperture is limited for identification of coherent noise sources of an underwater vehicle. The aperture of the used array can be reduced to meter-scale even when the frequencies of the tone noise are low. Although the array gain of superdirectivity beamforming decreases in nonisotropic noise field, the main lobe of the beam still keeps the same shape. Therefore, the performance of the proposed scheme is robust. Simulation analysis shows the following results: (1) Both the two beamspace TFA methods can precisely identify the underwater tone noise sources through a small aperture circular array, the radius of which is equal to 1.6 m, and the localization errors are less than 1 m when the signal-to-noise ratios are moderate; (2) The higher the frequencies of the tone noises are, the better the localization accuracy of beamspace TFA methods obtain; (3) The proposed scheme is less sensitive to the velocity of the underwater moving vehicle, and the localization results just have very small difference under various velocities; (4) The localization accuracy is related to distance, and decade meters is a reasonable choose for actual noise measurement; (5) Beamspace CT has better resolving accuracy when the information of measurement system is given, so the choice of the two beamspace TFA methods can be decided according to the actual measurement condition.
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Keywords:
- identification of noise sources /
- Doppler effect /
- superdirectivity beamforming /
- time-frequency analysis
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[15] Brooks T F, Humphreys William M 2006 J. Sound Vib. 294 856
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[18] Yardibi T, Li J 2010 J. Acoust. Soc. Am. 127 2920
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[20] Tian F, Yang Y X, Wu Y Z, Yang L 2014 J. Electron. Inform. Tech. 36 2889 (in Chinese) [田丰, 杨益新, 吴姚振, 杨龙 2014 电子与信息学报 36 2889]
[21] Sun C 2007 Underwater Sensor Array Signal Processing (Xi'an: Northwestern Polytechnical University Press) pp80-82 (in Chinese) [孙超 2007 水下多传感器阵列信号处理 (西安: 西北工业大学出版社) 第80–82页]
[22] Ma Y L, Yang Y X, He Z Y, Yang K D, Sun C, Wang Y M 2013 IEEE Trans. Ind. Electron. 60 203
[23] Xu L J, Yang Y X, Yang L 2014 Acta Electron. Sinica 42 2247 (in Chinese) [徐灵基, 杨益新, 杨龙 2014 电子学报 42 2247]
[24] Boashash B 2003 Time Frequency Signal Analysis and Processing: A Comprehensive Reference (London: Elsevier) pp48-53
[25] Yang Y, Peng Z K, Dong X J, Zhang W M, Meng G 2014 IEEE Trans. Signal Process. 62 2751
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[1] He Z Y 1996 Progress in Physics 16 600 (in Chinese) [何祚镛 1996 物理学进展 16 100]
[2] Yang D G, Wang Z T, Li B, Luo Y G, Lian X M 2011 J. Sound Vib. 330 1352
[3] Yang D G, Luo Y G, Li B, Li K Q, Lian X M 2010 Acta Phys. Sin. 59 4738 (in Chinese) [杨殿阁, 罗禹贡, 李兵, 李克强, 连小珉 2010 物理学报 59 4738]
[4] Park S H, Kim Y H 2001 J. Acoust. Soc. Am. 110 2326
[5] Chen M Y, Shang D J, Li Q, Liu Y W 2011 Acta Acoust. 36 489 (in Chinese) [陈梦英, 商德江, 李琪, 刘永伟 2011 声学学报 36 489]
[6] Yang D S, Guo X X, Shi S G, Hu B 2012 J. Vib. Shock 31 13 (in Chinese) [杨德森, 郭小霞, 时胜国, 胡博 2012 振动与冲击 31 13]
[7] Hui J, Hu D, Hui J Y, Yin J W 2007 Acta Acoust. 32 356 (in Chinese) [惠娟, 胡丹, 惠俊英, 殷敬伟 2007 声学学报 32 356]
[8] Zhai C P, Zhang M W, Liu Y D, Zhang Y 2013 Acta Acoust. 38 281 (in Chinese) [翟春平, 张明伟, 刘雨东, 张宇 2013 声学学报 38 281]
[9] Cigada A, Ripamonti F, Vanali M 2007 Mech. Syst. Signal Process. 21 3645
[10] Yan G H, Chen Z F, Sun J C 2009 Journal of Northwestern Polytechnical University 27 378 (in Chinese) [严光洪, 陈志菲, 孙进才2009 西北工业大学学报 27 378]
[11] Liu Y C, He Y A, Shang De J, Shang D J, Sun C. 2013 Acta Acoust. 38 533 (in Chinese) [刘月蝉, 何元安, 商德江, 尚大晶, 孙超 2013 声学学报 38 533]
[12] Shi J, Yang D S, Shi S G 2011 Acta Phys. Sin. 60 064301 (in Chinese) [时洁, 杨德森, 时胜国 2011 物理学报 60 064301]
[13] Shi J, Yang D S, Shi S G 2012 Acta Phys. Sin. 61 124302. (in Chinese) [时洁, 杨德森, 时胜国 2012 物理学报 61 124302]
[14] Wang Z W, Xu L J, Yang Y X, Wang X B 2012 J. Vib. Shock 31 118 (in Chinese) [王志伟, 徐灵基, 杨益新, 王秀波 2012振动与冲击 31 118]
[15] Brooks T F, Humphreys William M 2006 J. Sound Vib. 294 856
[16] Fleury V, Bulte J 2011 J. Acoust. Soc. Am. 129 1417
[17] Fleury V, Bulte J 2006 12th AIAA/CEAS Aeroacoustics Conference Cambridge, MA, May 8-10, p2654
[18] Yardibi T, Li J 2010 J. Acoust. Soc. Am. 127 2920
[19] Xu L J, Yang Y X 2014 J. Electron. Inform. Tech. 36 1119 (in Chinese) [徐灵基, 杨益新 2014 电子与信息学报 36 1119]
[20] Tian F, Yang Y X, Wu Y Z, Yang L 2014 J. Electron. Inform. Tech. 36 2889 (in Chinese) [田丰, 杨益新, 吴姚振, 杨龙 2014 电子与信息学报 36 2889]
[21] Sun C 2007 Underwater Sensor Array Signal Processing (Xi'an: Northwestern Polytechnical University Press) pp80-82 (in Chinese) [孙超 2007 水下多传感器阵列信号处理 (西安: 西北工业大学出版社) 第80–82页]
[22] Ma Y L, Yang Y X, He Z Y, Yang K D, Sun C, Wang Y M 2013 IEEE Trans. Ind. Electron. 60 203
[23] Xu L J, Yang Y X, Yang L 2014 Acta Electron. Sinica 42 2247 (in Chinese) [徐灵基, 杨益新, 杨龙 2014 电子学报 42 2247]
[24] Boashash B 2003 Time Frequency Signal Analysis and Processing: A Comprehensive Reference (London: Elsevier) pp48-53
[25] Yang Y, Peng Z K, Dong X J, Zhang W M, Meng G 2014 IEEE Trans. Signal Process. 62 2751
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