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| 1 | Optimal beamforming for arbitrary arrays using second-order cone programming显示文摘Two optimal beamforming approaches for sensor arrays with arbitrary shapes and element directivities are proposed. The first one minimizes the sidelobe level while keeping the distortionless response in the direction of the desired signal and maintaining the mainlobe width. The second approach maximizes the array gain while keeping the mainlobe direction and controling the sidelobe level which is strictly guaranteed to be below a prescribed value. Array weight norm constraint is used to improve the robustness of the two optimal beamforming approaches against random errors. The first approach provides the optimal tradeoff among the sidelobe level, the beamwidth and robustness; and the second approach provides the optimal tradeoff among the array gain, the sidelobe level and robustness. Both optimal beamforming problems are formulated as the second-order cone programming which can be easily solved using well-developed interior-point methods. Results of computer simulations and lake-experiment for a circular array demonstrate superior performance of the approaches proposed in this paper in comparison to some existing adaptive-based algorithms. | YANShefeng MAYuanliang SUNChao | 2005 | Chinese Journal of Acoustics2005，24，1： | 24 |
| 2 | Inversion for the sea bottom acoustic parameters by using the group time delays and amplitude of normal mode显示文摘The group time delays and amplitudes of the normal mode are derived using the normal mode filter. The sea bottom sound speed, density and attenuation are inversely deduced by matching the group time delays and the amplitude of the normal mode. A genetic algorithm (GA) is used for optimization search in the parameter space. The inverted attenuation has the nonlinear frequency relationship a = 0.29f1.91 dB/m (the unit of frequency is kHz) in the frequency range 200 - 500 Hz. The theoretical transmission loss calculated using the deduced parameters matches the experiment data very well. | LI Zhenglin YAN Jin LI Fenghua GUO Lianghao(National Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100080) | 2003 | Chinese Journal of Acoustics2003，22，2： | 15 |
| 3 | Frequency invariant beamforming via optimal array pattern synthesis and FIR filters design显示文摘An approach to designing time domain broadband frequency invariant beamformer via optimal array pattern synthesis and optimal FIR filters design is proposed. First, the working frequency band is decomposed into a number of narrow band frequency bins. The array weights at each frequency bin are designed via optimal array pattern synthesis methods to insure that the synthesized pattern approximates the desired one within the mainlobe area.Then, a bank of FIR filters corresponding to the input channels are designed to provide the frequency responses that approximate the array weights in the working frequency band for each sensor. Finally, each sensor feeds a FIR filter and the filter outputs are summed to produce the beam output time series. Both array pattern synthesis and FIR filters design problems are formulated as the second-order cone programming (SOCP), which can be easily solved using well-developed interior-point methods. Results of computer simulations and lake-experiment for a twelve-element semicircular array demonstrate satisfactory performance of the proposed approach. | YANShefeng MAYuanliang | 2005 | Chinese Journal of Acoustics2005，24，3： | 14 |
| 4 | Laboratory simulation on acoustic well-logging with phased array transmitter显示文摘Two small scale acoustic phased arrays with 4 elements have been designed and assembled in the laboratory. Experiments have been carried out with them. It is found that both directivity and radiation lobe width of the phased array can be regulated by changing the time delay between the input signals on neighboring elements. Results measured are in good agreement with those calculated. By using the phased array as an acoustic transmitter and hydrophone as a receiver, small scale acoustic well-logging simulations have been carried out both on an aluminum model well and on a concrete one. Experimental results show that, by increasing the time delay of the input signals on neighboring elements, the steered radiation angle of the phased array becomes larger and larger, and generation conditions of the refracted compressional wave and the refracted shear wave are reached successively, and the refracted compressional wave, the refracted shear wave and the Stoneley wave axe strengthened, respectively. Therefore, by choosing element spacing of a phased array and acoustic wave frequency appropriately, the main radiation lobe of the phased array can be widened to cover the first critical angle of all kinds of formations, which makes it possible to apply phased array acoustic well-logging in any formation continuously without regulating directivity of the phased array. | QIAO Wenxiao CHEN Xuelian DU Guangsheng FANG Jun LI Gang(Faculty of Natural Resources and Information Technology, University of Petroleum Beijing 102249) | 2003 | Chinese Journal of Acoustics2003，22，4： | 14 |
| 5 | Theoretical analysis and experimental results of interference striation pattern of underwater target radiated noise in shallow water waveguide显示文摘在浅水里不变的波导是一个吸引人的话题在最近散发的噪音的直接波浪的三 decades.The 干扰现象在水下从海表面和海底部的目标和思考波浪能被看作浅水 waveguide.The 干扰有条纹或刻痕之状态的一个典型盒子直接波浪和它的思考的模式有效并且为更好理解浅水波导 invariant.The 的本质的全面数字干扰 pheno | LI Qihu WANG Lei WEI Chonghua LI Yi MA Xuejie YU Haichun | 2011 | Chinese Journal of Acoustics2011，30，1： | 13 |
| 6 | On the certain semi-analytical models of low-frequency acoustic fields in terms of scalar-vector description显示文摘Behaviour of scalar and vector characteristics of steady-state acoustical field is modeled based on analytical-numerical approach. This field is radiated by low-frequency monochromatic point-like source in the deterministic layered shallow sea, which has various hydrologic and bottom conditions. Approach being developed is free of any mathematical approximations and without the difficulties it enables to calculate sound field vector characteristics for various models of shallow sea. Owing to this fact the complete description of underwater acoustical situation is possible that is useful to make a prognosis for the experiment. A number of regularities of wave field scalar-vector functions are discovered and discussed. | OlegE.Gulin YangDesen | 2004 | Chinese Journal of Acoustics2004，23，1： | 13 |
| 7 | The concise fractional Fourier transform and its application in detection and parameter estimation of the linear frequency-modulated signal显示文摘A concise fractional Fourier transform(CFRFT) is proposed to detect the linear frequency-modulated(LFM) signal with low signal to noise ratio(SNR).The frequency axis in time-frequency plane of the CFRFT is rotated to get the spectrum of the signal in different angles using chirp multiplication and Fourier transform(FT).For LFM signal which distributes as a straight line in time-frequency plane,the CFRFT can gather the energy in the corresponding angle as a peak and improve the detection SNR,thus the LFM signal of low SNR can be detected.Meanwhile,the location of the peak value relates to the parameters of the LFM signal.Numerical simulations and experimental results show that,the proposed method can be used to efficiently detect the LFM signal masked by noise and to estimate the signal's parameters accurately.Compared with the conventional fractional Fourier transform(FRFT),the CFRFT reduces the transform complexity and improves the real-time detection performance of LFM signal. | CHEN Yanli GUO Lianghao GONG Zaixiao | 2017 | Chinese Journal of Acoustics2017，36，1： | 13 |
| 8 | Passive source range estimation with a single receiver in shallow water显示文摘An approach for long-range passive impulsive source ranging with a single receiver in shallow water is proposed,which utilizes the frequency spectrum of the warped signal autocorrelation function via warping transform.For an ideal waveguide,there are invariable frequency features both in the frequency spectrum of the warped signal corresponding to modal cut-off frequencies and the warped signal autocorrelation function due to modal interference.These intrinsic frequency features can be used to passive source ranging.So,the approximate relationship between the frequency of warped signal at an unknown source range and the intrinsic frequency extracted by the time warping transform is derived.These rules can be generalized to an actual shallow water waveguide.Employing an acoustic model to offer the invariable frequency spectrum features,the impulsive signal data collected by a single hydrophone in the North Yellow Sea in December 2011 are analyzed to verify the proposed source ranging approach.The estimated ranges are in good agreement with the ranges measured by GPS,and the mean relative error of range estimation is less than 10%. | QI Yubo ZHOU Shihong REN Yun WANG Dejun LIU Jianjun FENG Xiqiang | 2015 | Chinese Journal of Acoustics2015，34，1： | 13 |
| 9 | Research on 2D imaging technique for concrete cross section显示文摘二条信号处理途径被介绍在具体 structures.When 的超声的 NDT 改进成像分辨率低频率的B扫描数据被合成的孔集中处理技术( SAFT ),因为低频率的察觉信号盖住一种相对长 period.Wavepacket 分解技术( WDT ), wavepacket 将进一步被伸长这里被介绍解决描述原版的使用一些参数表明的这个 problem.This | LI Qiufeng SHI Lihua LIANG Dakai | 2010 | Chinese Journal of Acoustics2010，29，1： | 11 |
| 10 | Passive ranging based on acoustic field interference structure using double arrays(elements)显示文摘Two kinds of passive ranging algorithms are proposed combined with waveguide invariant theory based on the important characteristic of the ocean waveguide that the interference structure is stable and can be observed in the low-frequency acoustic field,in order to explore the passive ranging method suitable for the towed line array sonar.The double arrays (elements)model is adopted,so the LOFARgram and bearing-time records of the each array (element)can be obtained.Then the frequency-time records can be extracted by processing the LOFARgram via Radon transform,so the passive ranging can be achieved combined the corresponding ranging algorithms.And the feasibility of the algorithms has been verified by simulation researches and positioning accuracy analysis. | YU Yun HUI Junying | 2012 | Chinese Journal of Acoustics2012，31，3： | 11 |
| 11 | A high precision calibration method for long baseline acoustic positioning systems显示文摘To solve the problem that traditional long baseline(LBL) positioning system is easily affected by severe sound speed varying results in low calibration precision, low efficiency and inconsistent position using different references, we propose a high precision array calibration method. We use distances between beacons to build error adjustment model. This model improves the calibration performance of traditional calibration method. The theory shows this method can achieve equal calibration precision with distance measurement precision in horizon. This method can improve the calibration efficiency, solve position ambiguity and achieve high precision especially in deep ocean. The shallow water experiment shows this method has millimeter calibration precision which is equal to distance measurement error. The calibration precision improves from centimeter to millimeter compared to traditional calibration method.The method also decreases the operation complexity. The localized positions are more close to GPS compared to traditional method, which has great application values. | HAN Yunfeng ZHENG Cuie SUN Dajun | 2017 | Chinese Journal of Acoustics2017，36，4： | 11 |
| 12 | Application of cylindrical linear phased array in casing borehole显示文摘一个超声的分阶段执行的数组( UPA )变换器在听觉的 logging.First 为地上凿穿成像和 casing 检查被介绍,一个圆柱的线性分阶段执行的数组( CLPA )它由压电的元素的数字组成一致地在柱体的表面上散布了,被设计并且在电的系统的控制下面用元素的不同的组播送并且收到声学的波浪的 fabricated.By , CLPA 罐头(s)地上凿穿的所有区域能动态地围并且 rapidly.Then | SHI Fangfang WU Xianmei KE Yijing ZHANG Bixing | 2010 | Chinese Journal of Acoustics2010，29，1： | 10 |
| 13 | Direction of arrival estimation and signal recovery based on single snapshot compressed sensing in frequency domain显示文摘Direction of arrival(DOA) estimation and signal recovery is the base of the underwater target localization,tracking and recognition.Based on the compressed sensing theory,a method for DOA estimation and source signal recovery is proposed using the single snapshot processing of the received array signal in frequency domain.The received array signal are transformed to frequency domain,and the single snapshot data in frequency domain are regarded as the measured data of the compressed sensing.According to the frequency,searching orientation and array manifold,the overcomplete array manifold is constructed as the sensing matrix of the compressed sensing.Both the target signal and power of the searching orientation are estimated by the basis pursuit method to complete DOA estimation and signal recovery.Simulation results show that the proposed method has a number of advantages over the minimum variance distortionless response(MVDR) method,including improved robustness to noise,fewer requirement in number of sensors and snapshots.And the correlation coefficient of the signal reaches up to 0.89.Experiment results in real environments verify that the proposed method performs more effectively in the detection of weak targets than the MVDR method and can be applied to real sonar system. | KANG Chunyu LI Qianyan ZHANG Xinhua LI Jun | 2016 | Chinese Journal of Acoustics2016，35，2： | 10 |
| 14 | Principle and simulation of coherent interference suppression by a three-sensor array显示文摘The Principles of coherent interference suppression are presented by a three-sensor array. The formulae of extracting expected signals from strong interference are derived. The selection of sensor space is discussed and then relationships between the space and frequency point, at which the signals can be extracted, are given. When expected signals are band- limit, the conditions of the selected sensor space, which should be satisfied, are given. Lastly, Performance of interference suppression is analyzed when the amplitude of interference power spectra of signals Received by three sensors fluctuates, and the expressions of relative error of the extracted signals and processing gain are derived. The theoretical and simulation results show that signals can be extracted from strong background interference without any information about signals and interference expect for the arriving direction of signals, that the space between sensors should be smaller than half wavelength of upper limit freqency when the expected signals are band-limit, and that performance of extracting signals will decline with the increase of fluctuation of interference spectrum amplitude. | ZHU weijie, SUN Jincai, SUN Yiyuan (Institute of Acoustic Engineering, Northwestern Polytechnical University Xi’an 710072) | 2002 | Chinese Journal of Acoustics2002，21，2： | 10 |
| 15 | Active control of radiated sound using nearfield pressure sensing显示文摘Based on nearfield sound pressure sensing to pick up error information, an approach for constructing active acoustic structure to effectively reduce radiated sound power at low frequency is proposed. The idea is that a nearfield pressure after active control is used as error signals and transformed into an objective function in adaptive active control process.Firstly sound power expression using near-field pressure radiated from a flexible structure is derived, and then three kind of nearfield pressure based active control strategies,i.e.minimization of radiated sound power, minimization of sound power for dominant radiation modes and minimization of sound power for modified dominant radiation modes are respectively presented and applied to active control of radiated single and broadband noise. Finally computer simulations on sound power reduction under three strategies are conducted and it is shown that the proposed active control strategies are invalid and considerable reduction in radiated sound power can be achieved. | CHENKe'an YINXuefei | 2004 | Chinese Journal of Acoustics2004，23，3： | 10 |
| 16 | Receiving response of towed line array to the noise of the tow ship in shallow water显示文摘The receiving response of towed line array to the noise radiated from the tow ship is investigated through normal mode modeling and computer simulation.The phenomenon that the maximum output of the towed line array is away from the endfire direction towards the tow ship is explained.The result is important for the understanding of the phenomenon and also for the application research concerning the suppression of the noise from the tow ship as well as adequate application of towed array techniques in shallow water. | MA Yuanliang LIU Mengan ZHANG Zhongbing TONG Li(1 Institute of Acoustic Engineering, Northwestern Polytechnical University Xi’an 710072) (2 Hangzhou Institute of Applied Acoustics Fuyang 311400) | 2003 | Chinese Journal of Acoustics2003，22，1： | 10 |
| 17 | Beamforming for broadband constant beamwidth based on FIR and DSP显示文摘A method to design a beamformer for broadband constant beamwidth is presented. Constant beamwidth is important in sonar systems for sea bottom observation and classification applications. For a given frequency band, a number of frequency points are chosen to represent the response of an arrary element. For each frequency point a beamforming weight vector can be deduced to satisfy the given beamwidth requirement by existing methods. Therefore, for a broadband array of N elements, each row of the N’ M weighting matrix represents the frequency response of an element of the array which can be satisfied by a FIR filter designed by model - reference adaptive technique. The sum of outputs from a bank of N FIR filters provides a beamformed output and so it is very handy to be implemented by DSP hardware. | ZHANG Baosong MA Yuanliang (Institute of Acoustic Engineering, Northwestern Polytechnical University Xi’an 710072) | 2000 | Chinese Journal of Acoustics2000，19，3： | 10 |
| 18 | On fast estimation of direction of arrival for underwater acoustic target based on sparse Bayesian learning显示文摘The Direction of Arrival(DOA) estimation methods for underwater acoustic target using Temporally Multiple Sparse Bayesian Learning(TMSBL) as the reconstructing algorithm have the disadvantage of slow computing speed.To solve this problem,a fast underwater acoustic target direction of arrival estimation was proposed.Analyzing the model characteristics of block-sparse Bayesian learning framework for DOA estimation,an algorithm was proposed to obtain the value of core hyper-parameter through MacKay's fixed-point method to estimate the DOA.By this process,it will spend less time for computation and provide more superior recovery performance than TMSBL algorithm.Simulation results verified the feasibiUty and effectiveness of the proposed algorithm. | WANG Biao ZHU Zhihui DAI Yuewei | 2017 | Chinese Journal of Acoustics2017，36，1： | 9 |
| 19 | Traveling wave tube measurements for low-frequency properties of underwater acoustic materials显示文摘A traveling wave tube measurement technique for measuring acoustic properties of underwater acoustic materials was developed.Water temperature and pressure environments of the ocean can be simulated in a water-filled tube,and the acoustic parameters of samples of underwater acoustic materials are measured in the range of low-frequency.A tested sample is located at central position of the tube.A pair of projectors is separately located at both ends of the tube.Using an active anechoic technique,the sound wave transmitting the tested sample is hardly reflected by the surface of secondary transducer.So the traveling sound field is built up in the tube.By separately calculating the transfer functions of every pair of double hydrophones in the sound fields from the both sides of the sample,its reflection coefficients and transmission coefficients are obtained.In the measurement system,the inside diameter of the tube isΦ208 mm,the working frequency range is from 100 to 4000 Hz,the maximum pressure is 5 MPa.The reflection coefficients and transmission coefficients of a water layer and a stainless steel layer samples are measured actually and calculated theoretically.The results show that the measured values are in good agreement with the values calculated,and the measurement uncertainty is not greater than 1.5 dB. | LI Shui LUO Maqi FAN Jinliang SHEN Jianxing | 2007 | Chinese Journal of Acoustics2007，26，4： | 9 |
| 20 | A prediction of the acoustic field of a vibrating box by FEM-BEM显示文摘A method based on Holmholtz equation is presented to predict thc acoustic radiation of a vibrating box by combining the finite clement method (FEM) with boundary element method (BEM). The prediction formulation is valid for all frequencies if an extra equation is added. The acoustic field of a vibrating box has been calculated and measured. The effectiveness of the method has been proved by test results. | YU Xingzhuo FANG Xing and ZHOU Yu (Department of Mechanical Engtheering I. Huazhong University of Science and Technology. Wuhan 430074) | 1995 | Chinese Journal of Acoustics1995，14，1： | 9 |
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