Sound Speed Profile Inversion Based on Mode Signal and Polynomial Fitting

doi:10.3969/j.issn.1000-1093.2019.11.013

Abstract

Abstract: A sound speed profile inversion method based on mode signal and polynomial fitting is proposed for the limitation of using the empirical orthogonal function to represent the sound speed profile in unknown environment. A concept of mode signal and the distribution characteristics of deep sea are given. It is proven through theoretical analysis and simulation that the low-order polynomial fitting can be used for presenting the sound speed profile in seabed.The five-order polynomial fitting can be used for accurately presenting the sound speed profile in 2 000 m-depth sea water. And in the inversion process, the copy mode signal vector is obtained by polynomial fitting of different parameters, and the mode signal is obtained from the test data by using the pulse acoustic signal, of which the parameters are optimized by genetic algorithm. The inversion performances of vertical array, single hydrophone and non-SRBR signal are simulated and analyzed by taking typical Munk profile as an example. It is concluded that the higher the order of polynomial is, the better the fitting effect of sound speed profile is. When a certain error is allowed, the lower order can be used for fitting the sound speed profile. The simulated results show that the performance of sound speed profile inversion using a single hydrophone is close to that of the vertical array, and the inversion performance under the condition of unknown seabed parameters can be improved by using the non-SRBR mode signal inversion. And finally, the performance of the proposed method is verified by using the pulse signal received by the single hydrophone in 4 000 m-depth sea water (distance: 180 km, and receiving and transmitting depth: 100 m). The results show that the inversion error of sound speed profile is less than 0.2 m/s. Key

Key words: singlehydrophone, modesignal, soundspeedprofile, matched-field, geneticalgorithm, polynomialfitting

CLC Number:

TB566

LIU Fuchen, JI Tuo, ZHANG Qiaoli. Sound Speed Profile Inversion Based on Mode Signal and Polynomial Fitting[J]. Acta Armamentarii, 2019, 40(11): 2283-2295.

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图14 利用非SRBR模信号的声速剖面反演收敛图
Fig.14 Convergent graphs of sound speed profile inversion parameters based on non-SRBR mode signal

图15 非SRBR模信号
Fig.15 Non-SRBR mode signal

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图18 接收信号(距离48.9 km、深度300 m)
Fig.18 Signal received by the hydrophone (distance:
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图19 接收信号(距离48.9 km、深度400 m)
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图21 测量声速剖面和反演声速剖面误差
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第40卷
第11期2019 年11月兵工学报ACTA
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